If there’s any looming, unwritten rule of learning a programming language ... and although they did use one to program the ATtiny85, they learned a lot along the way. It doesn’t take much ...

As the bootloader already burned, on board LED will start to blink when power up, but you must install relevant driver before first programming ... Circuit Description of the ...

This schematic is all you need to build your own voltage converter. [Lutz] needed a converter that could boost 5 V to 30 V to power a string of LEDs. The solution was to use low cost ATtiny85 and ...