UnoShield - Keypad

Arduino Uno Protoshield - Keypad analog Input 4.55 V = Key1 4.17 V = Key2 3.85 V = Key3 3.57 V = Key4 3.33 V = Key5 3.13 V = Key6 2.94 V = Key7 2.78 V = Key8 10x Digital Output 6x Analog Input 1x 12 V 1x 5 V 1x 3.3 V 3x GND