Step 1: Parts
In this project I used an ATtiny25 microcontroller, a handy little chip. I picked this one for this project because it's small and has 2 timers, which will make the programming easy. In order to complete this project you'll need a programmer, there are lots of methods on the internet for programming AVR's (look up "AVR programming" on instructables or google). I personally use the USBtinyISP that Ladyada sells.
Except for the AVR you can proabaly scalvange most of this stuff from old electronics. I needed to make an order to Digi-Key anyway, so I just got this stuff there.
What you need:
- 4.194304 MHZ Crystal
- 0.1 uF Capacitor
- 18 pF Capacitors (2)
- IC socket (optional)**
- Something to mount the parts on, and any tools needed to mount the parts (like a soldering iron).
**You don't need the IC socket, but it will make it very difficult to reprogram the AVR afterwards if you don't use one.