Retro Tech & Electronics | ESP32 and Arduino - MAX6675 Thermocouple Tests and Experiments @retrotechandelectronics | Uploaded October 2019 | Updated October 2024, 1 day ago.
Today we do some testing on the MAX6675 that I'd picked up on Banggood. I need a few of these for several projects, though I haven't settled on which type or what yet, I figured I would capture some tests in a video today and go way overboard on the unnecessaries. Everything I do is with the ESP32; not actually owning an Arduino, my assumption is that this will work just the same, given the simplicity of todays tasks.
The wiring is straight forward, I went with the 3.3 volt but its good to know that 5v is also a possibility straight off a power supply. I was surprised to see that the Adafruit library wont work for the ESP32, and I went with the one from Yurii Salimov, it worked just fine, designed exactly around the chip specification.
Apparently it would seem that Red goes to + and Blue to -. This is not immediately evident. Testing with a supplied example from the library showed sadly that my flir camera may be off a few degrees, I should check that out. My other thermometer confirms that the probe is off just a few degrees.
The first task was to assemble a program using PWM to use the blue LED on the ESP32 as a temperature indicator. I did this without map just to demonstrate whats going on. It works but not smooth because the range I was working in did not provide for wonderful resolution, also there is no secondary sensor to hold the base temperature value, so this method is flawed.
Instead I employed a PCM9685 driver board and a servo, mapping 0 to 100 degrees to the full throw of the servo. In this manner i could mount a cardboard display behind the servo and mark every 5 degrees celsius. With this, a Rube Goldberg Analogue thermometer is produced. It did work surprisingly well though, and demonstrates that this has great potential for automatic regulation at the output, given the input with little effort Consider that servo could be adjusting the gas at the lighter to maintain an ideal pre-set temperature.
Well, thats enough fun for one afternoon, more ESP32 stuff in the future.
Items used on the ESP32:
banggood.com/MAX6675-Sensor-Module-Thermocouple-Cable-1024-Celsius-High-Temperature-Available-p-1086406.html?rmmds=myorder&cur_warehouse=CN
#esp32 #arduino #maker
technocoma.blogspot.com
Today we do some testing on the MAX6675 that I'd picked up on Banggood. I need a few of these for several projects, though I haven't settled on which type or what yet, I figured I would capture some tests in a video today and go way overboard on the unnecessaries. Everything I do is with the ESP32; not actually owning an Arduino, my assumption is that this will work just the same, given the simplicity of todays tasks.
The wiring is straight forward, I went with the 3.3 volt but its good to know that 5v is also a possibility straight off a power supply. I was surprised to see that the Adafruit library wont work for the ESP32, and I went with the one from Yurii Salimov, it worked just fine, designed exactly around the chip specification.
Apparently it would seem that Red goes to + and Blue to -. This is not immediately evident. Testing with a supplied example from the library showed sadly that my flir camera may be off a few degrees, I should check that out. My other thermometer confirms that the probe is off just a few degrees.
The first task was to assemble a program using PWM to use the blue LED on the ESP32 as a temperature indicator. I did this without map just to demonstrate whats going on. It works but not smooth because the range I was working in did not provide for wonderful resolution, also there is no secondary sensor to hold the base temperature value, so this method is flawed.
Instead I employed a PCM9685 driver board and a servo, mapping 0 to 100 degrees to the full throw of the servo. In this manner i could mount a cardboard display behind the servo and mark every 5 degrees celsius. With this, a Rube Goldberg Analogue thermometer is produced. It did work surprisingly well though, and demonstrates that this has great potential for automatic regulation at the output, given the input with little effort Consider that servo could be adjusting the gas at the lighter to maintain an ideal pre-set temperature.
Well, thats enough fun for one afternoon, more ESP32 stuff in the future.
Items used on the ESP32:
banggood.com/MAX6675-Sensor-Module-Thermocouple-Cable-1024-Celsius-High-Temperature-Available-p-1086406.html?rmmds=myorder&cur_warehouse=CN
#esp32 #arduino #maker
technocoma.blogspot.com
![Sears Silvertone Twin Twelve 1484 Major Restoration Project [5/6]](https://i.ytimg.com/vi/vfQnLG_yjMQ/hqdefault.jpg "Sears Silvertone Twin Twelve 1484 Major Restoration Project [5/6]
We continue into part five with some of the cosmetic work, beginning with the prep and painting of the handle ends so that they can be re-installed into the cabinet. This gives pause and time to reflect on how far things have come since the beginning of the project. With that, everything is placed back into the cabinet and screwed back in. The top caps for the handle are snapped back in and everything receives and inspection.
This starts the disassembly of the speaker cabinet for repairs and restoration. This will need a lot of work. Much water damage, pieces missing that will require research as well. Chunks of corners are gone and a deep cleaning will be required before anything else.
Having cut back a section of inside material, repairs begin throughout the amp from easiest to hardest. Most sections roughed up upon completion to match the patina around the affected area. Corners were built back up with putty first.
On the inside there will need to be repairs to the bottom that has been rotted out by water damage. A clear glue will be soaked into the wood and let to settle overnight to turn it back into plywood and then knocked down flat again and filled with wood putty. The second sanding with the putty preps it for stain and polyurethane.
The cabinet handle end prep work is done the same way as the one for the amp cabinet. Once completed the handle is re-introduced to the speaker cabinet.
We did a visit to Hobby Lobby to find material for the sides and ended up with a 3in elastic belt to do the job and it came out perfect. Having been given a picture of the original setup I was able to replicate it.
One piece of speaker cable is chewed up in the 1st two feet so it was simply removed as to not cause issues later. With that the back of the cabinet was replaced and the Tolex received a final treatment.
The remaining belt material is glued to the backstops to protect the amp, the Amplifier then reinserted into the cabinet to see how it fits. Everything looks really nice. Cable management wasnt too bad either.
At this point I turn the Amp over to the wife for testing. sadly there were issues. Though the Amp itself ran great, troubleshooting shows that the speakers within the cabinet have issues. This proved to be conclusive and we proceeded with a demo of the amp using a different speaker and relegated the cabinet speaker repair to the next unscheduled video, part 6.
#retrotechandelectronics #vintagetubeamprepairs")
