Quantity   Component name
1 × Arduino Uno
1 × Protoshield
1 × Super Soaker Hydrostorm motorized water gun
1 × HC-SR501 PIR motion sensor
1 × 5V RadioShack relay (275-240)
2 × 9V DC wall warts
2 × #1 screws Electronic Components / Misc. Electronic Components
1 × 1n4001 diode For the relay flyback current