Arduino Pins


9v DC Power Supply


?: Not used
IOREF
RESET
3.3V: Supply
5V:    Supply
GND
GND
Vin

Analog (In): A0..A5

USB B - Cable to computer
    Power and Serial


AREF
GND

Digital (In/Out): 2..13

Pulse Width Modulation (Out):
    PWM ~(3,5,6,9,10,11)

TX->1: Serial (Out)
RX<-0: Serial (In)