CoreXY experimentation, testing movement by hand Jon Langseth 2014-09-29 | Based on the CoreXY concept and ideas from FABtotum to avoid crossing belts, I'm experimenting to see if I can get away with as few mounting-points for belts/pulleys as possible. This video shows that my prototype moves, as well as showing the CoreXY movements. Moving resistance feels very low, even if this is very simply built (no linear rollers/brass bearings, no attention made to precicion...). Next step: moving the parts using the motors :)Update 1: youtube.com/watch?v=h4HQlSZROQ8Update 2: youtube.com/watch?v=K6MRep9bwfsUpdate BLOG: http://defcon.no/mech/flaws-in-my-simplified-corexy-idea/Parts: http://www.thingiverse.com/thing:1418153Ideas from: http://corexy.com http://www.fabtotum.com http://reprap.org
HP-UX 10.20 Boot process on an Apollo 9000 D350 Jon Langseth 2020-09-07 | This shows the boot process of an older HP Apollo 9000 D-Class D350/1 server that was used as an oracle database server, displayed on a HP 700/96 serial console.openpa.net/systems/hp-9000_d-class_r-class.htmlweb.archive.org/web/20200224131448/terminals-wiki.org/wiki/index.php/HP_700/96en.wikipedia.org/wiki/HP-UX
DEC VT220 and VT320 demo using vttest Jon Langseth 2020-05-15 | I have a couple of DEC terminals in my collection, and after getting some questions about how these actually look and behave, I set up this demo. When setting up the demo, I did not have any modern systems to run vttest on that also had proper serial ports, so I had to jump through an old 486 PC with an old Linux install with classical getty and SSH2. That's the reason you'll see me using Telnet to get to a modern Linux distro.The terminals are more than 32 years old, still working without refurbishing. I am considering doing a refurb and adjustment to get a better screen-fill than what is shown here, but technically speaking there's no need for a re-cap or similar.
Z50AYMSound AY3-8910 sound card demonstration Jon Langseth 2018-11-03 | Presenting my Z50AYMSound chip-sound adapter for Z50Bus based 8-bit computers. The sound card is designed around the AY3-8910/YM2149 sound chip, with a Z50Bus interface. In this demonstration, I am using my LiNC80 SBC1 (http://linc.no/go/linc80) to run a port of PTxPlayer. All sound is as picked up by the camera, and all execution is done by the Z80 CPU on the LiNC80 SBC1.Buy this product at tindie.com/products/linc/z50aymsound-ay3-8910ym2149-sound-cardProduct description and documentation at http://linc.no/products/z50bus-ay3-8910-ym2149-sound-card/Source code and schematics at github.com/linc80/Z50AYMSoundLink to song played:https://zxart.ee/eng/authors/l/luchibobra/three-bad-mice/Result list from 3BM Open Air 2015:http://www.pouet.net/party_results.php?which=1575&when=2015
Montage of a Roadtrip in Oppland, Norway Jon Langseth 2018-10-12 | Amateur attempt, I just wanted to try assembling a montage video. It's probably too long, and the footage is far from great, but I had fun making it :)Locations: Gausdal, Helvete, Espedal, Skåbu, Kvikne, Frya, Biri, GjøvikMusic:"Fireflies and Stardust" Kevin MacLeod (incompetech.com)Licensed under Creative Commons: By Attribution 3.0 Licensehttp://creativecommons.org/licenses/by/3.0
Playing PT3 music on a YM2149 with my Z80 Homebrew computer Jon Langseth 2018-07-17 | Using my LiNC80 SBC1 homebrew computer and a prototype YM2149/AY3-8910 sound-adapter to play some PTxPlayer executable music under CP/M. The sound pickup on my camera is not the best... The tunes played are:MmcM - Summer of Rain (PT3)Vedem - Antidance (PT3)This description will be updated when the schematics and source code is made available.I sell the LiNC80 SBC1, see http://linc.no/go/linc80The sound-card prototype will eventually become a proper kit product that I'll be maiking available via Tindie :)Filmed in potatovision using a Nikon D5000 and no external microphone. The songs are believed to be in the public domain, and are used fairly to demonstrate functionality of an electronics prototype.
New 3D Printer frame for my CoreXY Jon Langseth 2015-12-19 | http://defcon.no/mech/opencorebot-update-3-new-frame-removes-flex-almost-done/I'm almost done putting together the new frame for my printer, but stopped to upload a short video, as seen above. I'm amazed at how much flex I've lived with on the old frame, and already really believe that I'll be getting better results with the new frame. Before, I could flex the frame on the corners by a few centimeters(!), the we one simply does not move. This gun' be gud'!
OpenCoreBot CoreXY printer running Jon Langseth 2015-12-05 | http://defcon.no/mech/opencorebot-update-2-im-changing-the-build/
Ill stop using Gemfan propellers .... Jon Langseth 2015-07-05 | These are Gemfan 6030 props, so far I've had more GF props fail mid-air than snapping due to crashing into stuff... I really don't think it's a QA issue, the design is just bad. Sticking with HQ brand props for now.
Practicing my loops and rolls (FPV raw, uncut and loud) Jon Langseth 2015-06-27 | The 250 size quadcopters in rate mode are so much fun! Mine is still a little underpowered, and I am very much a n00b at flying it XD
CoreXY experimentation update #2: conventional revised belt path Jon Langseth 2014-10-10 | After reviewing the naive errors in my thinking (see link below), I've concluded that my idea for simplifying the belt path will not work. So, a revised prototype has been built, now using 3D-printed belt idlers on the loops, and only straight & symmetric lines on the essential parts of the belt path.So, I'm no longer chasing the not-crossing belt path that FAtotum uses, instead going with a conventional, two-level CoreXY. There is now a crossing path on the belts, but the belts run on two separate levels, so there is no parts where the belt is forced to move in ways it's not designed to do.Post about my flaws: http://defcon.no/mech/flaws-in-my-simplified-corexy-idea/Previously:youtube.com/watch?v=cdTB0t-0FW8youtube.com/watch?v=h4HQlSZROQ8Parts: http://www.thingiverse.com/thing:1418153I hope you can notice the increased speed of moves after these modifications :)
CoreXY experimentation update: pen plotting with motor moves Jon Langseth 2014-09-30 | The prototype for my CoreXY experiment now moves by motor control. Using Marlin software on an Arduino Mega with RAMPS1.4 to drive the motors, I go through several speeds from 800mm/min to 24000mm/min, (that's 400mm/sec) moves. I have made no care to precision in the belt, and adding that to unevenly tightened belts, flex in components, and finally a pen that's not really fastened well, there is noticeable flaws in the resulting drawing. However, this also means the prototype highlights what areas of a final build will need extra attention. This first prototype is based on the CoreXY concept and ideas from FABtotum to avoid crossing beltsPrevious video: youtube.com/watch?v=cdTB0t-0FW8Update 2: youtube.com/watch?v=K6MRep9bwfsUpdate BLOG: http://defcon.no/mech/flaws-in-my-simplified-corexy-idea/Parts: http://www.thingiverse.com/thing:1418153Relevant links: http://corexy.com http://reprap.org/wiki/RAMPS_1.4 github.com/ErikZalm/Marlinhttp://blog.fabtotum.com/blog/2014/04/04/belts-and-stuff-experiences-to-share
Old Failthful vs HCopter: two copters, one landing ... Jon Langseth 2014-08-13 | I finally got around to editing the raw files from a flight in october 2013 that ... didn't end too well :)
Arducopter AC 3.1.2 Loiter test on PX4 Jon Langseth 2014-08-09 | Finally I've gotten stable Loiter, by getting GPS and Compass away from pesky annoying interference. I wasn't able to show long-duration position hold as I had planned, because my battery went flat a bit early :)The AC version I am using is quite old, so it is not representative of current AC Loiter state. I have also done minimal tuning of nav/loiter when doing the test.The frame I am using is a HobbyKing Q450 (really a Whirlwind FY450), equipped with generic 20A ESC's and NTM 28-30S 900 motors spinning unbalanced 1045SF plastic props, so the PX4 is seeing quite a lot of vibration. The GPS is a uBlox Neo-7M + HMC5883l compass from HobbyKing: http://hobbyking.com/hobbyking/store/__55558__Camera operator is youtube.com/user/hamartinse
Mikrokopter flight (propeller snaps at end of flight) Jon Langseth 2014-08-07 | Test-flying my Mikrokopter Quad after repairs, very happy with the result, until one of my propellers snaps because of material fatigue. Nice and safe crash, with minimal damage to the copter :)Youtube-music overlay: Hounds: Silent Partner
Pathfinder Mk.0 Tricopter maiden flight Jon Langseth 2014-08-06 | Maiden flight of my first bujild of a tricopter. The build is based on the common rcexplorer.se / David Windestål trike-design, but using aluminium 10x10mm profiles, FR4 as material for center-plate. Flight controller on this one is a KK2.1.5, ESC's are HK SS-series 18-20, tail servo is a TGY-9018MG.
FPV November - Biri Bruk Jon Langseth 2013-11-03 | Evening flight in November at Biri Bruk.Aircraft is my HCopter APM2.0Soundtrack: "Son of a Rocket" Kevin MacLeod (incompetech.com) Licensed under Creative Commons: By Attribution 3.0http://creativecommons.org/licenses/by/3.0
FPV forest flight in October Jon Langseth 2013-10-21 | FPV-flight in the forest.Music by MiuGlitch/MiuThe Emergence of Superintelligencesoundcloud.com/miuglitch/the-emergence-ofFlying my APM2 based "HCopter1", a scratch-built H-shaped quadcopter. First time flying in a really enclosed area..
Roll/Pitch camera gimbal test Jon Langseth 2013-10-14 | Testing a simple home-built rollt/pitch gimbal for my H-frame quadrocopter. I have a very bad roll-servo causing a lot of unwanted movement in the gimbal. I demonstrate the gimball locked and active.
AVRFBOSD Demo 4 Jon Langseth 2013-06-28 | I'm working on an OSD project (like so may others), the initial hardware-prototype is built around the LM1881 sync separator and an Atmel ATmega328p. This video demonstrates drawing of fonts/text, bitmaps and automatic fallback to generated video when input video is lost. Current code is at http://git.defcon.no/avrfbosd/ and Eagle 6.x schematics are at http://git.defcon.no/avrfbosd_hw/
Testing of 5GHz wireless at The Gathering 2013. Jon Langseth 2013-03-29 | At The Gathering 2013 we used a slightly non-standard way of doing Wireless survey...The survey procedure: icmp ping for latency test, real-time video stream for quality and throughput, a reloading web-page for "simple connectivity", IRC for communication between the surveyor and the Network Operation Centre. This screen setup is streamed out using twitch.tv and Open Broadcaster Software so the NOC has a real-time view of hte network quality.The challenge: provide 1000+ wireless clients low latency and high throughput in a very complex environment: a semi-dome shaped building with a metal roof, 5000 people with all sorts of computers and wireless equipment generating noise and interresting issues.The Wireless network is a 802.11a/n deployment of Cisco CAPWAP-enabled 1142, 2602, 3502 and 3602 access points, managed by the Cisco Wireless Controller 5508 and Cisco Prime Infrastructure. CleanAir and controller-managed RF adjustment, as well as careful tuning is key to providing complete coverage on ~10.000 m^2
AVRFBOSD Demo 3 Jon Langseth 2012-07-22 | I'm working on an OSD project (like so may others), the initial hardware-prototype is built around the LM1881 sync separator and an Atmel ATmega328p. This video demonstrates automatic fallback to generated video when input video is lost. The video starts with fallback-image, then the intro of Big Buck Bunny is connected as input video. Finally, that input is disconnected. Current code is at http://git.defcon.no/avrfbosd/ More info will be posted in later videos ...
AVRFBOSD Demo 2 Jon Langseth 2012-07-20 | I'm working on an OSD project (like so may others), the initial hardware-prototype is built around the LM1881 sync separator and an Atmel ATmega328p. In this video, a test-pattern is generated in a 128x92 pixels (16 bytes x 92 lines) screen-buffer. During the video, I switch between a GoPro video-feed and a test-signal generated by an ATtiny85. More info will be posted in later videos ...
AVRFBOSD Demo1 Jon Langseth 2012-07-19 | I'm working on an OSD project (like so may others), the initial hardware-prototype is built around the LM1881 sync separator and an Atmel ATmega328p. In this video, a quick test of the vsync&hsync interrupt routines is done, the boxes are generated by the ATmega using simple delays, animated by a simple Y-position iterator in the code main loop. More info will be posted in later videos ...
Et svevende blikk på Gjøvik Gård - Mikrokopter + GoPro Jon Langseth 2012-05-26 | Et overblikk på Gjøvik Gård / An overview of Gjøvik Gård.http://www.gjovikgard.no/ - http://mjosmuseet.no/museene/gjovik_gaardhttp://mikrokopter.de/ - http://gopro.com - http://www.frsky-rc.com
Onboard GoPro on a HobbyKing Bixler (Flight-test #2) Jon Langseth 2012-04-25 | Un-edited video from my Bixler video flight test #2. Using a standard HobbyKing Bixler ARF with 6x4 prop and a GoPro Hero HD2. No FPV or anything fancy used in this setup, I was only testing how well the combination flies. Video from the first test will not be posted...
Mikokopter + GoPro HERO HD2 testflight at Fastland, Gjøvik (uncut) Jon Langseth 2012-01-08 | Flying a mikrokopter.de hexacopter with a GoPro HERO HD2. No stabilization, the camera is simply mounted, quite some jello-effect because of this. The video is uncut (not edited).
Skjerven Skog RC raceway Sept. 2011 Jon Langseth 2011-09-23 | Bilder av Skjerven-banen ovenfra under dugnadsarbeid. Ikke helt fornøyd med denne videoen, men pytt.
Yet another piston door in Minecraft 1.7.2 Jon Langseth 2011-07-02 | This time I could not be bothered to operate switches, so I hooked it up to a simple redstone repeater oscillator. Also, showing off my tech-test-lab :)
Minecraft: Very crude piston door/portal Jon Langseth 2011-07-01 | einarjh and me cobbled together a 2x2 piston-powered door. The solution is anything but space efficient, occupying 7x11x7 blocks, primarily for redstone wiring, inverters and delays. Also, this is my first time testing fraps, so it is recorded using the demo mode....
Mikrokopter aerial video crash - motor burns out! Jon Langseth 2011-06-23 | During flight-testing of camera mount on my Mikrokopter hexa (Protokopter G4), one of the six motors burn out mid-air! I get full stop on one motor (and smoke in the video:P), but still manage to get the copter safely down. Phew!
Testing current limit, BL-Ctrl w/Turnigy TR28-26B brushless motor Jon Langseth 2011-05-22 | I have been having problems "hitting the ceiling" on my motor capacity with the Protokopters, so I decided to do an off-copter test. In this test, the BL-Ctrl is run on PWM, rather than the normal I2C. The rig is not as fancy as it may look ^_^ Control is provided by an Arduino running a slightly modified version of the "Knob" PWM demo. The "dial-indicator" is a standard RC servo connected to the same PWM signal as the BL-Ctrl. A 0-255 representation of the PWM value is sent via serial, to a simple perl-script that displays the value in a "font-bumped" terminal. I also discovered in a test that I did not film, that when the current-limit has been in effect for a while, thermal protection causes the FETs to shut down, cutting power completely! This will explain part of a "dropping out of the sky" problem that I have been experiencing.
Testing Arduino TVOut lib Jon Langseth 2011-05-15 | Testing the TVOut library for the Arduino on a breadboard-mounted ATMega328p. This may turn out to be the base of a simple OSD for RC-use.
Protokopter G4 test flight 2011-02-16 Jon Langseth 2011-02-16 | The Protokopter G4 is built from a mikrokopter FlightCtrl 1.1 updated to 1.2, four BL-Ctrl 1.2, two BL-Ctrl 1.1, Turnigy 2826-1350 and Arrowind 2210/30 motors, a 76cm (72cm axis-distance) hexa-frame with custom designed centerplates, flying with a Venom Power 4000mAh battery. EPP1045 and EPP1245 propellers were used. http://photos.defcon.no/2011-02-15-protokopter-g4-set1/ http://photos.defcon.no/2011-02-15-protokopter-g4-set2/ http://www.mikrokopter.de/ Sountrack: Static by Wintermute - Creative Commons Attribution-ShareAlike 3.0 Source: http://www.digitalgewitter.de / http://www.myspace.com/wintermutednb
Mogget flies a Mikrokopter for the first time! Jon Langseth 2011-02-16 | Maiden flight (and crash) og Mogget's Mikrokopter -- http://www.moshwire.com/mikrokopter-quadrokopter (second upload, edited)
5DOM IMU first data tests. Jon Langseth 2011-01-20 | Testing data sampling from a 5-degrees-of-measurement (5DOM) accellerator+gyro sensor board from SparkFun. The data is not filtered at all. Parts used: 5DOF Breakout ( http://www.sparkfun.com/products/9268 ) Atmel Atmega328p microcontroller with surrounding parts FTDI Basic Breakout ( http://www.sparkfun.com/products/9716 ) AVR-GCC, Qt ( http://qt.nokia.com ) and Qwt ( http://qwt.sourceforge.net )
Protokopter G3 test flight 2010-03-23 Jon Langseth 2010-03-23 | First camera-flight test of the third iteration of my "Protokopter". The Protokopter G3 is built from a mikrokopter FlightCtrl 1.1, BL-Ctrl 1.2, Turnigy 2826-1350 motors, a 50cm (46cm axis-distance) +-shaped frame, here flying with a Casio Exilim EZX11 and a Venom Power 400mAh battery.
Bondelia in-door RC touring Jon Langseth 2010-03-07 | GTL RC-klubb's bane for innendørs on-road touring, filmet ombord min Tamiya M05 med et Kodak C813., 7. mars 2010. http://rcklubben.no
Skjerven Skog RC raceway from the air, March 2010 Jon Langseth 2010-03-07 | It is still winter at Skjerven Skog, the off-road raceway of GTL RC-klubb, but the snow has been cleared to gove spring some help ;) Filmed on-board my Mikrokopter at 2010-03-06. Equipment used: 50cm Mikrokopter (http://www.mikrokopter.de), KX171 colour camera w/2.4GHz video transmitter and reciever (http://www.rangevideo.com), MC-12 RC-TX, Venom Power 4000mAh LiPo. http://rcklubben.no
ALTM1 Static test 2 Jon Langseth 2009-09-19 | Static test #2 fire of the Aluminium Test Motor 1 is another failure. Suspected causes: Blocked grain or blocked nozzle due to a failed igniter still stuck in the grain. Rear bulkhead shear bolt shears nicely, and the motor itself becomes a projectile. The "ping" sound towards the end of the video segment is the motor casing coming back down to ground.
Static test firing of KNSU powered rocket motor Jon Langseth 2009-09-17 | ALTM1, Aluminium Test Motor 1, test 1. Powered by a KNSU propellant grain. The grain was over-cooked, then wetted down and cast. This resulted in a really bad propellant grain, as evident from the stuttering.The rear end seal was made from tightly packed alu-foil, but gaps in this led to burn-through and significant rear-end leaks.The nozzle performs well, giving a nice thrust plume for one second when the propellant burned correctly, so the static test is not a failure, but proves potential for ALTM1.
KNSUFR+FeO Static Burn Jon Langseth 2009-09-06 | 65/25/10 KNO3 / Sucrose / Fructose with a dash of Iron Oxide. The grain size is roughly 170 grams.Casing made from PP plastic (37mm inner diameter), plug and nozzle made from Bentonite.The nozzle was not cured, and as a result the burn gave a one-second nozzled burn before the entire nozzle was blown out of the casing. The nozzled burn is at 00:09+ to 00:10+.Overall satisfied with the result of this grain.
KNERFR KNO3 + Erythritol + Fructose Jon Langseth 2009-09-05 | This time mixed at 70 / 15 / 15 (approx, no scale), boiled with 30 water down to paste, kneaded back to granules, and compacted.
KNFRSU+Fe rest Jon Langseth 2009-09-05 | Had to burn some leftovers after rescaling the mix of KNFRSUFe
KNFRSU+Fe Jon Langseth 2009-09-05 | This is a test burn of potassium nitrate (KNO3), Fructose (C6H12O6) and Sucrose (C12H22O11) with Iron Oxides added (Fe2O3 + FeO(OH) + Fe(OH)3), all in powder form. No precise measurements were made, the ratio is roughly 45/25/25/5. Potassium nitrate is a strong oxidizer and reactant, and must be treated with respect!
KNSU+Fe KNO3 + Sucrose + Iron Oxide powder burn test Jon Langseth 2009-09-05 | This is a test burn of potassium nitrate (KNO3) and Sucrose (C12H22O11) with Iron Oxides added (Fe2O3 + FeO(OH) + Fe(OH)3), all in powder form. No precise measurements were made, the ratio is roughly 60/35/5.Comparing this to the pure KNSU burn, the Iron Oxides reduces the burn rate significantly.Potassium nitrate is a strong oxidizer and reactant, and must be treated with respect!
