“Program an ATtiny13 development board with AVR assembly language.
There are a few variations for LEDs and buttons but the ATtiny13 is just an Arduino that only has PORTB. That can be enough for many applications. We’ll use a USBasp type external programmer.
The vendor provides this image of the board. LED D1 is connected to pin B3 and D2 is connected to pin B4. The blue button is for USB power and the red button resets the board.”