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DS1077 + Arduino
I've finally had a chance to get around to playing with the DS1077 configurable oscillator!The circuit to get it working is very simple, just hook up the Ardiono as the I2C master, I used a 10K pullup...
View ArticleRasPi R2 Pinout
http://iqjar.com/jar/connecting-to-the-gpio-pins-of-the-raspberry-pi/A handy link for future reference :)
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Prototype Propeller Accessory for RasPi
The prototype for my Propeller accessory is pretty much finished now. The final one will be a proper PCB with hopefully FOUR Propeller chips on it! I'm using one for this prototype to ensure that the...
View ArticleSuccess - RasPi programs a Propeller!
I've managed to get my RasPi module to program a Propeller and it's EEPROM using my "pushprop" program compiled and running on the RasPi under Raspbian.This was an interesting part of the project, as...
View ArticleMusings on dynamic clocking of microcontrollers
Before I embark on a voluminous treatise on the nuances of on-the-fly clock signal modulation I had better think about the potential pitfalls that might arise.Assuming that a DS1077 Programmable...
View ArticleRule 2: follow all the rules.
For once I followed the First Rule of Electronics Troubleshooting (FRET):Check your voltages.(from Leonardo da Vinci - "Reprehendo Tuum Voltages", quote from unpublished notes, volume 19 chapter...
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RasPi Propeller Shield - work commences!
Like any other electro-mechanical-engineeringly inclined hobbyist, I've spent my fair share of time drooling over the promotional videos for products like Solidworks or Zuken CR8000, but I'm still...
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Propeller network layout for RasPi accessory
Four Propellers... 64 user-GPIO pins... 1MB distributed SQI SRAM... Dynamic clock modulation...... makes for a lot of head-scratching and frowning.I've been roughing out a design for a PCB that has all...
View ArticleBeagleBone Black - EEPROM
Last week I took delivery of the new Beaglebone Black (see HERE and HERE). If you like the RasPi you'll love this too, only more so.Since I'm a pathological accessory maker for such devices, I have...
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BeagleBone Black - EEPROM (2)
Carefully crafting the contents of the 32KB EEPROM image, and then writing it into the appropriate device handle followed by a reboot yields this result...Despite the horribly slow EEPROM write cycle,...
View ArticleBeaglebone Black - EEPROM (3)
Descending further into the dimly-lit (figuratively and literally, since the documentation for this stuff is so hard to find) recesses of the BBB architecture, another minor success registered today.I...
View ArticleSometimes luck beats perseverance
Had one of those warm fuzzy moments where you're on the verge of throwing a piece of hardware in the dumpster when somehow you stumble over the tiny nugget of information that has been evading you ever...
View ArticleControlling six 17-segment digits using three I/O pins
Decided to start making good use of my "Propeller Professional Development Board" (PPDB) which has been sitting sadly idle and forlorn on the bench for a while.Set a goal of making a simple video game...
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Celestial Camera Mount
A couple of years back, while on holiday I took a few photos of the night sky with my DSLR camera and the standard lenses. Doing this gives some appreciation of how the solar system moves in relation...
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Celestial Camera Mount (Pt 2)
Just finished the hardware part of the control board for the camera mount. I'm using a 7.2v NiCAD RC car battery to power the whole thing. Conveniently, the EasyDriver board I'm using (the red board...
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Idea for concentrically aligning a worm screw with a motor shaft
Having failed to correctly align this screw section with the end of this stepper motor shaft in a previous blog post, I thought some more about a better way to do it.Then it hit me - I could use a...
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Gearbox Calcs
I would invite any mathematics enthusiasts among you to attempt to calculate the input : output ratio of this gearbox. With the help of a learned colleague at work I was able to settle on 931.222222...
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Stepper driver heatsink assembly
Some random pics of the ludicrously excessive heat sink I'm using to keep the EasyDriver's main IC cool can be seen below...Eagle-eyed readers will notice that the heat sink is from the graphics card...
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Random drawing of the week
Mounting plate for the celestial camera mount. Stepper attaches from one side, gearbox from the other.
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