HC-SR501 PIR Sensor with Arduino

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Learn how a HC-SR501 PIR Sensor works and how to interface it with the Arduino Board for detecting motion.

Akshay Jain

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Interfacing HC-SR501 PIR Sensor to Arduino

Now, let’s see how to connect the HC-SR501 PIR motion sensor to an Arduino UNO.

The wiring is quite simple: the sensor’s OUT pin is connected to digital pin 2 of the Arduino, while VCC and GND are connected to the 5V and GND pins, respectively.

Additionally, a 16×2 LCD display is included in the setup to show real-time status updates — such as whether motion is detected or no motion is present.
The connections between Arduino Uno and LCD are as follows:

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