AVR ISP Programmer

Amtel AVR Microcontrollers come in a number of variants. The one most Arduino users know is the 28 pin ATMega328 variant. However AVR chips come in 8-Pin, 14-Pin, 20-Pin and 40-Pin packages as well. The less pins on a chip mean less IO ports. The Digispark board which is an Arduino variant uses a ATTiny85 Microcontroller and has only 5 IO pins.

Arduino boards (eg Uno, Mega, Digispark) load software from the Arduino IDE via the USB port. This is only possible because the AVR Microcontroller on