The simple CW beacon controller C version of attiny45 CW beacon. The video how it works https://youtu.be/Up1wdF8RhrY Dependencies sudo apt install avr-libc avrdude gcc-avr Compilling and programming make flash Fuse bytes The project has no ability to set fuse bytes. I use default ones for my attiny45. If it's different for your chip - you need to set fuses manually.