This Arduino Nano based programmer board allows ATtiny 25/45/85 processors to be flashed with your custom code.
When I started trying to programme the ATtiny85 chips I bought several cheap USB programmer boards from eBay, Amazon etc but I couldn't get any of them to work. I eventually put an Arduino Nano based version together on a breadboard, from instructions I found on the internet, and was finally able to program my ATtiny.
Rather than have everything lashed together on a breadboard I created this simple PCB to give me a permanent setup, and added the facility to connect a programming clip to allow chips to be programmed in-situ.
More details, along with the Gerber files for the PCB, the Arduino Nano code and instructions on how to use the programmer are on my GitHub site...
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