Adafruit 2488 PCB design board METRO 328 with Headers - ATmega328 AVR® ATmega ATMega328

The processor has plenty of GPIO, Analog inputs, hardware UART SPI and I²C, timers and PWM, just enough for most simple projects. This version of the METRO 328 comes as a fully assembled and tested development board with headers attached. Also included are 4 rubber bumpers to keep it from slipping off your desk.

Price: 45.99 from Conrad Electronic