Arduino based Motion Sensor light Circuit

Arduino based Motion Sensor light Circuit

The main goal of this project is to design an Arduino based motion sensor light circuit which is used to detect the motion to turn on a light.The circuit of this project mainly built with the Arduino board, PIR sensor, LED and USB with type a and b connector. When the motion is detected by a PIR sensor which is integrated with an Arduino board, then the Led light will be turned ON.

Arduino based Motion Sensor light Circuit

Pin-1 of the sensor connects to the voltage terminal of the Arduino board. Pin-3 connects to the GND in of the Arduino. The o/p of the Pin-2 connects to the digital pin D3.From these connections, pin-1 and pin-3 gets 5 volts by the Arduino board. So, the PIR sensor gets the voltage from these connections to power ON and operate.And it is through pin-2 that the Arduino board gets an o/p from the motion sensor. When the motion sensor does not detect any motion, then the o/p is LOW and the Arduino receives no voltage signal. When the sensor detects motion, the output is HIGH and the Arduino board receives a voltage signal, which can then activate another device to turn ON such as an LED is used for this circuit.The LED is connected between pin-13 and GND terminals. Here, an external resistor is not necessary to limit the current flow to the LED. Because, pin-13 has inbuilt resistance to no external resistor is necessary to limit current to the LED, because pin 13 already has built-in resistance to restrict the flow of current.