Quantity   Component name
1 × Arduino
3 × RELAY 5 Volt
3 × optocoupler
3 × npn transistor
10 × 1k resistor
1 × 100 ohm resistor
1 × battery Evaluation, Demonstration Kits, Boards and Modules / Evaluation Kits, Boards and Modules
1 × breadboard Electronic Components / Misc. Electronic Components
3 × screw terminals
3 × led red 5mm
3 × 220 ohm resistor