From Just in Time
Just In Time Project Pages
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...
|Internet of Hamsters
It's hamsters. It's internet. What more could you possible want?
|Telescope and camera control
WiFi-to-serial bridge allowing existing apps to talk to a telescope, but also control an attached camera
|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:
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.
Our set up
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:
CC2500 Wireless System, on hold while we're working on the
- Nordic NRF24L01+ wireless system (first library now part of avr_utilities)
- Update our RGB spotlights to use Bit Angle Modulation
- AVR DAC Audio playback
- Midi Chord generator
- Solarpower Chicken Lighting System
- PIC-based MidiFilePlayer
- DCC Train control system
- simple GPS logger based on rs232 receiver
- sunrise alarm clock
Items that were on this list, but are finished now (without write-up)
- 100Mhz SX based Frequency Counter (done)
- AVR Bootloader System (done)