Automatic Stairs Light Control

Components Details () {
Veroboard,
12v 5Pin Relay x 12
c945 NPN Transistor x 12,
PC817 Optocoupler x 12,
Arduino Nano,
ultrasonic sensor hc-sr04 x 2,
4007 Diode x 13,
1K Resistor x 24,
10K Resistor x 12,
Green LED x 12,
jumper wire,
12v led strip lights,
green wire connectors,
female to female jumper wires,
12v power supply
}