[list][*]LEDs too dim: check you've set the pinmode to OUTPUT eg [code]pinMode(PB0, OUTPUT);[/code][/*][*]ATtiny85s come as default set to 1MHz. Always do "Tools -> Burn Bootloader" before you start. Mostly you'll want "8 MHz (Internal)"[/*][*]Digispark: Sketch -> Upload, not Sketch -> Upload using Programmer[/*][*]Digispark: plug it into USB only when told, [b]not before[/b] Sketch -> Upload[/*][/list][code][/code]