Relay can be used with #Arduino to activate any AC device. Here is the Smart Study Lamp which get on and off according to the sensed input by Ultrasonic Sensor.

Circuit requirements are:
(1) Arduino UNO
(2) Relay
(3) Ultrasonic Sensor
(4) LED Bulb
(5) Copper wires
(6) Jumper wires
(7) 9V battery

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