Simple Transistor Latch Circuit + Easy Free Circuit Simulator Kevin Darrah 2026-09-21 | Simple Transistor Latch Circuit + Easy Free Circuit Simulator
Ultimate Low Power Freezer Monitor with trigBoard! WiFi Push Notification Instantly #shorts Kevin Darrah 2023-01-23 | #shorts Fun trigBoard project to build a freezer alarm with a simple on/off thermostat - the one here is set to trip ~19F, but can get these in any temperature you want. I actually built this for someone, and it has already saved them on more than one occasion... trigBoard Docs page here: trigboard-docs.readthedocs.io/en/latest/index.html
Standalone ESP32 Programmer and Test Solution Kevin Darrah 2022-03-12 | Introducing the Standalone ESP32 Programmer Board! Uploads firmware from an SD card with this board. Great for updating firmware or factory programming boards. More details on the docs page: espprogrammerdocs.readthedocs.io/en/latest/index.htmlESP Programmer Board Available on Tindie: tindie.com/products/26244Twitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
2uA Ultra low Power Motion Sensor that Plays mp3 Files and Sends Notifications - ESP32 (trigBoard) Kevin Darrah 2022-03-08 | This was a quick trigBoard project inspired by a fox my brother discovered on his security camera sniffing around the chicken coop. Using the ESP32 based trigBoard along with a high quality Panasonic sensor, we have a ~2uA system! Project page is here - everything you need: trigboard-docs.readthedocs.io/en/latest/motionSound.html#Tindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Mass Write SD Cards from ESP32 - Might be a useful trick someday Kevin Darrah 2022-02-15 | I had to flash 100 micro SD cards, so used an ESP32 to help automate this by uploading the files to SPIFFS first, then with a little code, write those files to the SD cards. And why not make a video about it, in case you also ever need to do something like this? SD Card Connections (Schematic):espprogrammerdocs.readthedocs.io/en/latest/source.htmlCODE: github.com/krdarrah/ESP32_SDcardFlasherESP Programmer Board Available on Tindie: tindie.com/products/26244Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Simple Power Outage Monitor w/Push Notifications - Cellular 4G LTE Kevin Darrah 2021-06-30 | Need an easy way to get a push notification if your property looses power? Here's an easy way using a cellular based 4GLTE module from Particle: Everything you need: Project page here: trigboard-docs.readthedocs.io/en/latest/cellularProject.html#power-outage-monitoringBoron here: store.particle.io/collections/ethersim/products/boron-lte-cat-m1-noram-ethersimBatteries: adafruit.com/category/574Boron QuickStart: docs.particle.io/quickstart/boronCode here: gist.github.com/krdarrah/314027798992a8ee29cc05a4cb47960fScroll a bit down here to see web hook integration setup: trigboard-docs.readthedocs.io/en/latest/cellularProject.html#trigboard-gateway-softwarePushover is here: pushover.netMy guide on setting that up: trigboard-docs.readthedocs.io/en/latest/supportedServices.html#pushoverAnd you can set that up to send to multiple people: trigboard-docs.readthedocs.io/en/latest/supportedServices.html#sharing-notificationsThe ultimate home security system is here: trigboard-docs.readthedocs.io/en/latest/cellularProject.htmlTindie link to trigBoard if interested: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Geiger Counter (BR-6) - Battery/Charging UPGRADE - Full Tutorial Kevin Darrah 2021-06-26 | Was going to say this is just a quick video... but nope, my classic rambling style upgrading this cheap Geiger counter (BR-6). Originally, this thing has terrible charging capabilities basically "cooking" the Ni-MH batteries. Why not just upgrade this to use a common Lithium cell? That's what this video is all about... Geiger counter is BR-6: ebay.us/tVIEUy Charger Board: amazon.com/dp/B071RG4YWM/ref=cm_sw_em_r_mt_dp_NWW0N7JCNN6V8CNE70E1?_encoding=UTF8&psc=1 MCP1702 regulator I used: digikey.com/short/5mwmnbmhThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Useful IoT with Home Assistant & trigBoard - Turn a WiFi Bulb ON Automatically! Kevin Darrah 2021-05-19 | This is something really cool and useful that I just whipped up with the trigBoard. What's nice is that it still works with my existing home security system based cellular and TCP messaging. This just adds some useful features to my existing setup with home assistant:Full Guide HERE: trigboard-docs.readthedocs.io/en/latest/homeassistant.html#trigboard-activated-wifi-light-bulbTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Home Assistant & trigBoard (Ultra Low Power Sensors) Full Tutorial - New Favorite IoT Platform! Kevin Darrah 2021-05-03 | This is my new favorite IoT project and I've been spending a ton of time adding all of my trigBoard projects to it and creating custom automations and scenes based on all kinds of events. If you haven't checked out Home Assistant yet, then I highly recommend throwing an image of it on a spare Pi just to mess around with it... you'll get the itch... trust me :) And make sure to also check out ESPhome as well for adding other sensors/plugs/lights/whatever, but trigBoard really shines due to its ultra low power and trigger front-end, but also the onboard nano amp RTC that let's you easily log sensor data at some interval. This is what I do with several boards to then log/visualize the data via influxDB and Grafana.Home Assistant here: home-assistant.iotrigBoard docs: trigboard-docs.readthedocs.io/en/latest/index.htmlHome Assistant Guide: trigboard-docs.readthedocs.io/en/latest/homeassistant.htmlTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Expanding TONS of Switches/LEDs with Arduino (Teensy + ATtiny) and Controlling over MIDI! Kevin Darrah 2021-03-27 | Big thanks to this customer for giving permission to showcase this project here - lots to discuss and hopefully you'll pick something up here to use in your own projects! TLDR: Expanding IO from a Teensy 4.1 over I2C bus using ATtiny1614's super easy to do this and the MIDI control from the Teensy keeps it simple. Mega Tiny Core: github.com/SpenceKonde/megaTinyCoreThe chip I'm using: github.com/SpenceKonde/megaTinyCore/blob/master/megaavr/extras/ATtiny_x14.mdBuild your own UPDI programmer: github.com/SpenceKonde/megaTinyCore/blob/master/MakeUPDIProgrammer.mdTeensy: pjrc.com/store/teensy41.htmlTeensy Code: github.com/krdarrah/Teensy_IOexpansionATtiny Code: github.com/krdarrah/ATtiny1614_IOExpansionCheck out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Lithium Battery Protection Circuit Experiments - Self Discharge Measurements? and more! Kevin Darrah 2021-03-06 | This was one I was actually curious about, so decided to film the experiments. TLDR - protection board pulls ~4uA from the battery at all times. Cutout was 2.9V Over current wasTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Smoke/CO Detector with WiFi Push Notifications ESP32 (trigBoard) PART 2 CO Detection TESTED Kevin Darrah 2021-02-27 | Part 1 here: youtu.be/NuwXAvgs4HoHad an issue with the last method not waking the trigBoard when CO is detected... this was all resolved by adding a simple RC circuit to stretch the pulse to the trigBoard. All explained and tested in this video. Project page is here with everything you need: trigboard-docs.readthedocs.io/en/latest/SmokeCODetector.htmlAmazon produce page for same detector I'm using: amazon.com/gp/product/B000MXJ498/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1Tindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Adding IoT to a Smoke/CO Detector with ESP32! (trigBoard) with 3 wires! Kevin Darrah 2021-02-18 | NOTE - made a part 2 fixing the CO detection: youtu.be/JQKId7zr0v0One of my favorite projects here - trigBoard started with giving peace of mind that windows/doors are all monitored, then catastrophic events like flooding with the water sensor. This was the next project on the list for trigBoard and it was maybe the easiest with this off-the-shelf smoke/CO detector. Just three wires! NOTE - DO NOT DO THIS ON YOUR PRIMARY SMOKE DETECTOR! You are making modifications yourself and this could render the detector inoperable. Only for supplementing existing systems. I'm going to add these all over as well as for my 3D printer, so I'm not so nervous leaving that thing running when I have to leave the house. Project page is here with everything you need: trigboard-docs.readthedocs.io/en/latest/SmokeCODetector.htmlAmazon produce page for same detector I'm using: amazon.com/gp/product/B000MXJ498/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1Tindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
How To Read from ESP32 - CLONE/BACKUP Everything Kevin Darrah 2021-02-13 | This was kind of a fun one that you might find useful someday like I did. Esptool git reference: github.com/espressif/esptoolFlash chip datasheets: winbond.com/hq/product/code-storage-flash-memory/serial-nor-flash/?__locale=en&selected=128Mb#DensityHere's all of those commands you can use as a starting point and note that on windows, things will be slightly different. Just follow the same steps and you should be good: Read from Adafruit Huzzah board (4MB): /Users/kevindarrah/Library/Arduino15/packages/esp32/tools/esptool_py/2.6.1/esptool.py --port /dev/cu.usbserial-01D5ECE0 --baud 921600 read_flash 0 0x400000 adafruit.binWrite back to Adafruit Huzzah: /Users/kevindarrah/Library/Arduino15/packages/esp32/tools/esptool_py/2.6.1/esptool.py --chip esp32 --port /dev/cu.usbserial-01D5ECE0 --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size detect 0x0 /Users/kevindarrah/adafruit.bin Get Flash ID for size: /Users/kevindarrah/Library/Arduino15/packages/esp32/tools/esptool_py/2.6.1/esptool.py --port /dev/cu.usbserial-DA00Y7QG --baud 921600 flash_idRead trigBoard (16MB):/Users/kevindarrah/Library/Arduino15/packages/esp32/tools/esptool_py/2.6.1/esptool.py --port /dev/cu.usbserial-DA00Y7QG --baud 230400 read_flash 0 0x1000000 trigBoardbackup.binWrite trigBoard:/Users/kevindarrah/Library/Arduino15/packages/esp32/tools/esptool_py/2.6.1/esptool.py --chip esp32 --port /dev/cu.usbserial-DA00Y7QG --baud 921600 --before default_reset --after hard_reset write_flash -z --flash_mode dio --flash_freq 80m --flash_size detect 0x0 /Users/kevindarrah/trigBoardbackup.binTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Experiments with Super Capacitors for IoT Projects Kevin Darrah 2021-01-13 | Random testing of super capacitors - was running these tests on the bench and thought a video might be interesting? The project I'm planning for this is going to be really cool and will make a video on that soon. The 2.5F capacitor I'm using: DGH255Q5R5The google sheet project docs: trigboard-docs.readthedocs.io/en/latest/LogGoogleDocs.htmlConstant Current Regulator is a ZKE EBD-A20HPower Supply is an Otii ArcTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Easy ESP32-ESP32 Communication (BOTH TCP & UDP Tutorials with trigBoard) Kevin Darrah 2020-12-24 | Kind of a long one here, but these methods can be used to easily communicate between ESP32s - I have been updating my "Ultimate Home Security System" to use TCP instead of UDP, and so decided to make a video here showing that. Sorry for the long rambling :) This could be perfect if you only want to send data between two devices and even for a lot of trigBoard projects, like if motion occurs in the back yard, you can sound an alarm or turn lights on... something like that anyhow. Lots of resources: trigBoard Docs: trigboard-docs.readthedocs.io/en/latestThe Ultimate Home Security Project is here: trigboard-docs.readthedocs.io/en/latest/cellularProject.htmlLinks to sample Gateway code and other things you see here: trigboard-docs.readthedocs.io/en/latest/supportedServices.html#udp-tcpI made a good tutorial on working with character strings: youtu.be/tCJgnBI1D5oTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Low Power Water Detector Alarm Circuit and IoT with trigBoard (Immediate Push Notifications) Kevin Darrah 2020-12-18 | Super simple water detector circuit here and has been tested now for a couple months - this was of course designed to be an IoT water leak notifier, but in the video I show you how to make just a simple alarm circuit. Project page is here: trigboard-docs.readthedocs.io/en/latest/waterleakDetector.htmlTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Automated Factory Programmer and Tester for ESP32 (trigBoard Production Test Fixture) Full Tutorial Kevin Darrah 2020-11-14 | WARNING - LONG VIDEO but lots of good stuff in here. This is how I actually factory program and test each and every trigBoard. There are a few things I didn't mention in here, like why use USB-Serial programming instead of JTAG? the reason is because the user may want to reprogram that base firmware, so I need to test the auto-reset circuit. And that's also why I didn't have espressif pre-program the modules for me... not to mention the longer lead times involved. Code is here: github.com/krdarrah/trigBoardTesterProcessing here: processing.orgProject page is here: trigboard-docs.readthedocs.io/en/latest/index.htmlTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
How to Make a Better Hand Sanitizer with Arduino! LOWER POWER Kevin Darrah 2020-11-12 | This was a fun project to improve a super cheap soap dispenser to be used with hand sanitizer and significantly increase battery life! Full project detailed out here with hardware explanations and code walkthrough - everything linked to below: Soap Dispenser used: amazon.com/dp/B08CXTCLJQ/ref=cm_sw_em_r_mt_dp_ghnRFbP4ZP00H?_encoding=UTF8&psc=1 Hand Sanitizer: bedbathandbeyond.com/store/product/sparoom-reg-8-oz-spray-bottle-antibacterial-hand-sanitizer/5511915?opbthead=true&ta=typeahead&keyword=hand-sanitizer**UPDATE** Had a minor change in the drawing!CODE IS HERE and Diagrams: github.com/krdarrah/handsanitizerThat cool :) 328 board is here: tindie.com/products/14948and if adding IoT to this project, trigBoard would be perfect - I might do this if a good use case comes up: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Lowest Power (~3uA) MOTION Sensor - WiFi Connected with trigBoard Kevin Darrah 2020-11-05 | I couldn't believe how low the standby current was on this PIR sensor, so I had to make a video about it - comparing the AM312 based sensor at ~13uA total, the Panasonic EKMB1201111 shown in the video here totals up to ~3uA, which includes the trigBoard. Pretty unbelievable! I've been using this now for a couple months and have been very happy with the performance. Project page is here: trigboard-docs.readthedocs.io/en/latest/motionSensor.htmlAnd if you want to build the Cellular based system, that is fully documented here: trigboard-docs.readthedocs.io/en/latest/cellularProject.htmlTindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
trigBoard Catches Package Thieves! But I messed up... Kevin Darrah 2020-10-27 | This is kind of a funny one here, but really just a good use-case for the trigBoard and how having my phone on do-not-disturb mode totally failed me here! Note that I'm almost positive nothing was stolen here, and for all I know, these could have been my neighbors placing my mail in the box? like if it was miss-delivered? Who knows... But either way, this was a wakeup call as to how the trigBoard "should" be configured - LOL, don't hate my click bait!Project Page: trigboard-docs.readthedocs.io/en/latest/cellularProject.htmlTindie link to trigBoard - options to add boards to build exact cellular based system as shown in video: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Garage Open/Closed/Left Open Push Notification from ESP32 (trigBoard) with Mercury Tilt Sensor Kevin Darrah 2020-09-25 | Just a quick IoT project with the trigBoard. WARNING - this project uses a mercury switch, so make sure you understand the dangers and what to do if it is exposed: epa.gov/mercuryProject Page: trigboard-docs.readthedocs.io/en/latest/garage.htmlTindie link to trigBoard - options to add boards to build exact cellular based system as shown in video: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
DIY Door Bell Push Notification with ESP32 (trigBoard) Full Tutorial Kevin Darrah 2020-09-20 | Part of a series of videos on monitoring everything with the trigBoard! The door bell is an obvious one to add IoT to and one of my favorites. Just note that this was installed in my house, which may be different from how your doorbell is wired... make sure you fully understand how everything works and only make connections when the power is off. This project is documented here parts/schematics/etc: trigboard-docs.readthedocs.io/en/latest/doorbell.htmlTindie link to trigBoard - options to add boards to build exact cellular based system as shown in video: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Is Your Cheap Pro-Mini REAL? Easy Way to Test! (ATMEGA328P) Kevin Darrah 2020-09-15 | First video benchmarking the suspicious Pro-Mini: youtu.be/PlGycKwnsSwSecond Video Forensically Analyzing the ATMEGA: youtu.be/o0rEzcKYzGwThanks to Sensible Micro: sensiblemicro.comThe test code is here: gist.github.com/krdarrah/6e6cb94c1df015e8e9f910ae5cf85299Easiest to just throw that into your own sketch and run it - let me know what you get! This is just a quick test that I did that showed something distinctly different between the good and questionable parts. My Tindie store - I have a board there with genuine ATMEGA328 :) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Professional Forensic Analysis of a sketchy Pro-Mini (ATMEGA328P) - is it Counterfeit? Kevin Darrah 2020-09-14 | Part 1 on the pro-mini analysis: youtu.be/PlGycKwnsSwPart 3 Test Sketch to see if yours is real: youtu.be/eeDC1m7ANJISo based on that, there were a lot of suggestions that maybe the ATMEGA328 was still genuine, but somehow failed QA and ended up on some kind of great grey market... well I decided to reach out to Sensible Micro Corporation to conduct a full forensic analysis on the part! Check them out here: sensiblemicro.comMy Tindie store - I have a board there with genuine ATMEGA328 :) tindie.com/products/13776Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Full Tutorial - ESP32 + 4G Cellular + Battery Backed Ultimate Home Security System trigBoard/Boron Kevin Darrah 2020-09-09 | This is a massive tutorial showing you every detail in building the ultimate home security system that hosts its own network, so no existing WiFi or internet access needed. Also, it's battery backed! so even if AC power is lost, the system still works! trigBoard was designed to be insanely low power, so batteries can last for years and years!Project details here: trigboard-docs.readthedocs.io/en/latest/cellularProject.html#Tindie link to trigBoard - options to add boards to build exact cellular based system as shown in video: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Quick-n-Dirty Testing ESP32 Range Extenders for IoT! Kevin Darrah 2020-08-26 | Just something I was planning on doing anyhow, so figured I'd share. This Nat-Router code runs great on the ESP32 and work pretty good for light weight range extenders - perfect for IoT projects (like trigBoard).That Nat Router Code: github.com/martin-ger/esp32_nat_routertrigBoard Docs: trigboard-docs.readthedocs.io/en/latest/index.htmlVideo I made on burning bin files: youtu.be/jIIYrOe25S0Or even easier to follow might be this: youtu.be/Lwpxrq9v1YwTindie link to trigBoard - options to add boards to build exact cellular based system as shown in video: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Sleep Mode breaks on cheap Pro-Mini? Testing ATMEGA328 - is it counterfeit? Kevin Darrah 2020-08-11 | Part 2 Forensic Analysis: youtu.be/o0rEzcKYzGwPart 3 Test Sketch to see if yours is real: youtu.be/eeDC1m7ANJIReferenced from this video I did a while back on low power modes of the ATMEGA328: youtu.be/urLSDi7SD8MThis came in from a viewer that was trying to run this same code on a cheap pro-mini purchased on eBay. Said the board was pulling over 100uA!! Should be less than 1uA! I had to find out what was going on here, so here we go... TEST CODE: github.com/krdarrah/lowPowerATMEGAtestPS - I may send this chip off for further analysis - what do you think?My Tindie store: tindie.com/products/13776Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
ESP32 OTA (Over The Air) Programming with EASY GUI - Code and Tutorial Kevin Darrah 2020-06-17 | Wanted to build a simple GUI that anyone could use to upload new code their ESP32, just send a bin file to them and they can handle it from there... This was written in Processing: processing.orgPython mode: py.processing.orgMy code is HERE: github.com/krdarrah/ESP32_GUI_ProgrammerJust download the application folder down for your operating system if you just want to use it. My Tindie store: tindie.com/products/13776Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Fixing a Slot Machine from the 90s! Ballys MPU Board - Dead Battery Kevin Darrah 2020-04-29 | Since I was going to fix this slot machine anyhow, thought I'd make a video showing the process. Pretty straight forward actually - just dead battery on the MPU board, so could just as easily swap that out... which I did a few years back, but now that I got the board on my bench, decided to give it a little upgrade. Since this machine only gets used every once and a while, I went ahead and made the battery rechargeable. That should keep it going just as long as they power it up at least every couple months to recharge the battery. Well let's hope anyway.My Tindie store: tindie.com/products/13776Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Super Long Video on Programming ESP32 w/trigBoard - ArduinoIDE/CommandLine USB/OTA Mac/Windows Kevin Darrah 2020-04-24 | Had this idea while factory programming the trigBoard. I wanted to make a tutorial on how to program the trigBoard, but figured while I'm at it, I'll just go threw the command line/terminal methods as well. And since it's slightly different on a PC, I had to show both Mac/PC. Well that was the idea... then I realized I made an 18minute video!!Forgot to mention a few things - you can also program with JTAG (much faster), or even order modules pre-programmed with your bin file. I had to exercise the auto-reset circuit I designed, so wanted to program them as my customers would. Wiki: kevindarrah.com/wiki/index.php?title=TrigBoardCode for this project here: github.com/krdarrah/trigBoardV8_BaseFirmwaretrigBoard available from my Tindie store: tindie.com/products/13776Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Battery Powered E-Paper COVID19 Display - ESP32 (trigBoardv8) Kevin Darrah 2020-04-05 | Updating the original project from here: youtu.be/HX2szVGYoX4Now with trigBoard, so easily can change the wakeup time and state all with the Bluetooth connected chrome app. Really shows off some of the new features with the trigBoard v8. Wiki: kevindarrah.com/wiki/index.php?title=TrigBoardCode for this project here: github.com/krdarrah/coronaDisplay_trigBoardEpaperArchive of that bitmap tool: http://www.kevindarrah.com/download/Image2Lcd.ziptrigBoard available from my Tindie store: tindie.com/products/13776Display: 7.5" epaper display: amazon.com/waveshare-7-5inch-HAT-Raspberry-Consumption/dp/B075R4QY3LNote that I'm using the 640x384 resolution - looks like there's a newer display with higher res, so display library may not work properly with that one. Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Introducing the Ultimate In Low Power WiFi - trigBoard v8! Kevin Darrah 2020-04-01 | This has been a couple months in the making - based on the success of its predecessor trigBoard v7, we now have v8. A complete overhaul of the design with a ton of new features! - Based on the ESP32 (Combo WiFi BT Module)- Preloaded with Base firmware to support Pushover, Push Safer, IFTTT, UDP, MQTT- SINGLE DIGT uA SLEEP CURRENT!! Battery life? Well... long time!- Speaking of the battery, now supports input voltage range 1.8-5V So perfect for a lithium Battery 4.2V, or even a pair of AA/AAA batteries. Your choice- Programmable RTC, so now you can set the wake time to whatever you want to check status of the contact. - And the heart and soul of the trigBoard is the wake trigger input, which now can wake on both OPEN/CLOSE. You pick either or both. - Base firmware allows you to configure everything on the board over a Bluetooth connection from a simple Google chrome app written in p5.JstrigBoard available from my Tindie store: tindie.com/products/13776All Information is maintained here on the Wiki: kevindarrah.com/wiki/index.php?title=TrigBoardThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
They keep changing the Data! My COVID 19 status display - now back to JSON! Kevin Darrah 2020-03-21 | The first video to this "series": youtu.be/HX2szVGYoX4NEW CODE: kevindarrah.com/download/arduino_code/CoronaCheckerjsonAgain.inoThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
CDC changed the format for the COVID 19 data - from JSON to CSV Kevin Darrah 2020-03-15 | The last video was about the epaper display showing the latest cases reported: youtu.be/HX2szVGYoX4That method of scraping the JSON data from the cdc.gov website only lasted one day before they decided to change to a csv format... here is that updated tutorial and code: CODE HERE:kevindarrah.com/download/arduino_code/CoronaChecker_csvVersion.inoAnd changed again - latest here: youtu.be/ytz7ztfj6t0Thanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Coronavirus (COVID 19) Status Display Tutorial - ESP32 (WiFi) + EPAPER Kevin Darrah 2020-03-13 | I thought about building something like this after refreshing the CDC website over and over again throughout the day... here is what I came up with, but note there's a lot here you can reuse into other projects where you might need to pull down and parse data from a website. In this case, data is pulled from the CDC covid19 page: cdc.gov/coronavirus/2019-ncov/cases-in-us.htmlHardware used: ESP32 board adafruit.com/product/34057.5" epaper display: amazon.com/waveshare-7-5inch-HAT-Raspberry-Consumption/dp/B075R4QY3LNote that I'm using the 640x384 resolution - looks like there's a newer display with higher res, so display library may not work properly with that one. ARDUINO CODE HERE (not the best, but I threw this one together in just a few hours...)kevindarrah.com/download/arduino_code/CoronaChecker.inoUPDATED HERE TO PARSE CSV HERE: youtu.be/qPvZOX2k0SgDownload Epaper library here: github.com/ZinggJM/GxEPDThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
trigBoard v8 Sneak Peak - The Ultimate Low Power IoT platform - based on ESP32 Kevin Darrah 2020-02-05 | Wondering where I've been lately? With all the success of the trigBoard v7, I decided to design a new version with a ton more features.Tindie link to trigBoard: tindie.com/products/kdcircuits/trigboard-ultra-low-power-esp32-iot-platformThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
How I cut my water bill in Half with IoT! Kevin Darrah 2019-11-14 | I recently connected an ESP32 to my water meter: youtu.be/D6JG2DZeWeYThat was a fun project, but had no idea how useful it really was. I've been monitoring water usage all over the house, and discovered that the shower was using over 3 gallons/minute!! That's crazy, so by just replacing the bathtub spout, we're back down to 1gal/min... sure enough, this had a huge impact on the water bill the following month. Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Ultra Low Power Light Detector Circuit! Wake up processor from Light! trigBoard Example Kevin Darrah 2019-11-04 | Wanted to build a low power light detector circuit with stuff I had on hand - this is what I came up wit. This ties into the water meter usage project: youtu.be/D6JG2DZeWeYWiki Page for the circuit to interface with trigBoard: kevindarrah.com/wiki/index.php?title=TrigBoardLightDetecI actually found that LED I used, bought from Sparkfun back in 2010.... was COM-10023 and still seems to be available. Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
IoT Water Meter with ESP32 - Full Tutorial and Code Kevin Darrah 2019-10-31 | The water bill doubled last month, so time to engineer something to get to the bottom if it!! I actually did find out what the cause was, but gonna save that for a separate video. This is an ESP32 hooked up to a super sensitive Hall effect sensor. Got the inspiration for this project here after almost giving up: instructables.com/id/Monitoring-residential-water-usage-by-reading-muniTHE CODE HERE: kevindarrah.com/download/arduino_code/waterMeter_10_29_19_FOR_VIDEO.zipCheck out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
How to use Excel to Animate LEDs! Arduino + WS2812 LEDs Kevin Darrah 2019-10-19 | I actually just created this excel utility to help create some cool animations for a halloween costume... It just generates the function calls to set the bytes properly in the LED array. Here's the links mentioned:Original how-to video on the WS2812: youtu.be/VAa4duqMrgsThen something in the Arduino Core broke that sketch, so I fixed it in this video: youtu.be/ev-Di5GVQ3YThe Excel file I used: kevindarrah.com/download/arduino_code/16x16_utility.xlsxThe CODE:kevindarrah.com/download/arduino_code/WS1812_V4_ANIMATION_FOR_VIDEO.inoThat 328 board for the costume here: tindie.com/products/14948Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Text String Tutorial in C Code! Tutorial using Arduino, copy/move/parsing/etc... Kevin Darrah 2019-10-17 | Just my 2 cents in how to handle and manipulate text strings (Character Arrays) in C code... all shown using Arduino, but is universal on embedded systems coded in C. Very useful stuff in here that can be used in many projects! It's a doozy, so here are the timestamps: 2:13 Intro, Size, Length, and Null8:10 Concatenate10:33 Copy and Move16:09 Comparing two strings17:09 Find string in another string21:06 Parsing a string, like data separated by commas24:50 Convert string to integers, long, float and back to string28:00 Pass and return strings with functions29:25 Parse data from a serial port - real exampleTHE CODE:kevindarrah.com/download/arduino_code/STRINGS_FOR_VIDEO.zip Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Police Scanner on the Raspberry Pi! Full tutorial with Code! Kevin Darrah 2019-10-11 | Found this website where people can livestream from their scanners: broadcastify.comGave me the idea to make a dedicated device out of a raspberry Pi to cycle through a few of my favorite streams - mostly police channels, but can also stream music. Lots of good stuff in this one that you can use in many projects. Sorry if you thought this was going to be an SDR project... for some reason I gotta feeling those comments are coming.It's a long one, so here's the breakdown: 4:22 Hardware7:30 setup10:56 export application11:25 Start app automatically on boot13:05 safe shutdown and kill power14:13 disable blank screen14:50 setting up urls16:38 code walkthroughProcessing app code and sample url.txt here: kevindarrah.com/download/policeScanner.zipNote that you might want to comment out the fullscreen line of code, just for testing, just in case things crash on you.Oh and make sure you select the analog output for audio on the Pi, Just right click on the volume control icon on the upper right. I keep the volume at around 75% for clean output to the amplifier.Get processing here: processing.orgLatch Circuit: kevindarrah.com/wiki/index.php?title=LatchPowerCircuitMy other raspberry pi tutorial you might find handy: youtu.be/4vdnGZWjBTk Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Arduino Wireless Bluetooth from CHROME - EASY Tutorial! Kevin Darrah 2019-10-04 | Actually just found out about this the other day when I was trying to create a simple Bluetooth app in processing... turns out a library exists for the p5.js side of it that works in chrome! How cool is that!REFERENCES:The HM-10 module I used - amazon.com/gp/product/B06WGZB2N4/ref=ppx_yo_dt_b_asin_title_o01_s00?ie=UTF8&psc=1That cool ATMEGA board :) tindie.com/products/14948Processing - processing.orgp5.js - p5js.orgBluetooth Library: yining1023.github.io/p5ble-websiteNOTE - if you publish to your own website, make sure it's https not http It won't work. CODE HERE: Processing (P5.js) project here for the app: kevindarrah.com/download/arduino_code/BluetoothGUI.zipArduino:kevindarrah.com/download/arduino_code/Bluetooth_HM10_10_1_19.inoCheck out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
No-IDE Arduino Programming! Hex/Bin File upload from Command Line - AVR/ESP8266/ESP32 Kevin Darrah 2019-09-23 | Need to program 1000 boards quickly? or maybe you want to upload a pre-compiled binary/hex file? Well, this might be the solution for you! Might be common knowledge for some people, but just in case you didn't know about this, here you go! Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
DEMO & Installation -The Ultimate DIY Home Security System - ESP8266 (trigBoard) + 4G LTE Modem Kevin Darrah 2019-09-08 | All details found here on the project page: kevindarrah.com/wiki/index.php?title=TrigBoard_Ultimate_SystemFULL TUTORIAL:Part 1 - youtu.be/exBlNLhZdzQPart 2 - youtu.be/oMOrBnf3OpwPart3 - youtu.be/WNH6tyQpwF4Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
PART 3 Cellular -The Ultimate DIY Home Security System - ESP8266 (trigBoard) + 4G LTE Modem Kevin Darrah 2019-09-07 | All details found here on the project page: kevindarrah.com/wiki/index.php?title=TrigBoard_Ultimate_SystemCheck out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
PART 2 ESPNOW - The Ultimate DIY Home Security System - ESP8266 (trigBoard) + 4G LTE Modem Kevin Darrah 2019-09-06 | All details found here on the project page: kevindarrah.com/wiki/index.php?title=TrigBoard_Ultimate_SystemInspiration here: youtube.com/watch?v=6NsBN42B80QReference here: github.com/HarringayMakerSpace/ESP-NowCheck out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
PART 1 Intro & Hardware - The Ultimate DIY Home Security System - ESP8266 (trigBoard) + 4G LTE Modem Kevin Darrah 2019-09-05 | All details found here on the project page: kevindarrah.com/wiki/index.php?title=TrigBoard_Ultimate_SystemCheck out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
Super Quick Home Automation with ESP8266 - Control Anything from Google/Alexa Kevin Darrah 2019-07-21 | This was a crazy easy project... almost too easy. I wanted to control one of those cheap LED strips from an ESP8266. Just used io.adafruit.com with IFTTT, then google assistant as the trigger, and you're all set.IFTTT:ifttt.comio.adafruit: io.adafruit.comMQTT on Adafruit: learn.adafruit.com/welcome-to-adafruit-ioCODE: kevindarrah.com/download/arduino_code/trigBoard_GoogleASST_7_20_19.inoNote that I'm using a trigBoard, but you can use anything you want including anything based on the ESP32. One cool thing about the trigBoard is that it has an on-board timer, which will automatically reset the ESP8266 once an hour... this is nice for situations when the power goes out or the WiFi router is reset. It ensures the ESP8266 always has a WiFi connection. Check out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
How to figure out Battery Life? Examples with trigBoard! Kevin Darrah 2019-07-09 | I get this question all the time - what size battery should I use with the trigBoard?. the answer, well it depends. The trigBoard is an on-demand type of application, so battery life is going to vary depending on how many times you "wake" the trigBoard up. All of the info in this video should help you out with any battery powered application, and please keep in mind that this is all just a way to "estimate" life... there are many other factors to this, especially self-discharge. Don't think you're going to get 30yrs from a li-poly cell. wiki for trigBoard: kevindarrah.com/wiki/index.php?title=TrigBoardAndreas video on uCurrent/current ranger- I bet you all already have seen this: youtube.com/watch?v=HmXfyLyN38cThe Otii Arc (not sponsored) qoitech.com/products/standardOnline battery estimator: oregonembedded.com/batterycalc.htmCheck out my Tindie store (trigBoard is available) tindie.com/stores/kdcircuitsThanks to all the Patrons for dropping a few bucks in the tip jar to help make these videos happen! patreon.com/kdarrahTwitter: twitter.com/KDcircuitsFor inquiries or design services:kdcircuits.com
