These pages contain descriptions of our electronics projects, mainly involving AVR microcontrollers.
| WS2811 LED strips & 8Mhz AVR
Want to know how to drive a WS2811 led string from an 8 Mhz AVR? This page has the code and explains it. Works for Arduino too...
| USB 433Mhz transceiver for $3
Cheap 433Mhz receivers and transmitters are ideal to communicate with your microcontroller, but can also be used to control inexpensive RF-controlled switches. If you've got $3, an ebay account and a soldering iron, you can now control your light switches through a USB port.
| Digital FD-8 repair
Roland FD-8 hi-hat pedals have a tendency to become unresponsive over time. Instead of trying to repair the internal film resistor, why not completely replace its guts with a small microcontroller for accurate control without wear and tear? If you think a microcontroller is overkill, we also have an analog electronics version.
|Breadboard AVR Programming Headers|
Here are some finished, or work in progress activities:
|Project||Page status||Project status|
|Identifying Christmas Lights (ongoing project log)||started||ongoing|
|Fast, arduino compatible digital pin functions, digitalWrite() in 2 clock ticks||started||finished|
|Sending location information from an Android phone to a Nikon camera||started||halted|
|WS2811 "Water torture"||started||finished|
|Driving the WS2811 at 800 kHz with an 8 MHz AVR||finished||ongoing|
|4x4x4 Led Cube - AVR doing Bit Angle Modulation / Single PCB base||started||finished|
|Cheapest ever 433 Mhz transceiver for PCs||complete||finished|
|Roland FD-8 Issues: Hall Sensor Modification||complete||finished|
|Antique Clock Start Stop Automation||complete||finished|
|Knight Rider walking led experiments
demonstrating pwm, either through SX Virtual Peripherals or inline and How to drive many leds with a few io-pins.
|Wireless LCD display||rudimentary||finished|
|Driving a shift register led display driver.||rudimentary||finished|
|Driving 4 seven segment led displays||not started||finished|
|'Very Limited Space' Midi Sustain Pedal.||not started||finished|
|Reading Rotary Encoders||complete||finished (component)|
|Oven temperature controller||in progress||halted|
|RGB Light Show (Wired/Wireless)||started||finished|
|Digital Analogue Clock with Traffic Light alarm||not started||finished|
|Diffusing Leds the Fast Way||complete||finished|
Some older software projects:
You might want to know how to run avrdude from eclipse under linux.
Atmel has released a 4K version of the well-known Attiny2313, called the Attiny4313. It is fully (pin) compatible, with the only difference that it has double memory. The Attiny4313 is not yet recognized by Avrdude, so we have modified the Avrdude config file to be able to program it. This link contains the Attiny4313 section that should be added to your config.
Nowadays, we prefer to do our stuff in SMT because it avoids the bore of drilling holes (yes, pun intended). And you can make use of cheap SMT resistor and capacitor assortments so you'll always have the right values available. Working in SMT requires making PCBs. We use the toner transfer method. One tip: the ironing sticks much better if the paper is wet. And one other tip: etching in cupric chloride works very well and you never run out of etchant!
Here are some projects on our to do list:
Items that were on this list, but are finished now (without write-up)