PIR Motion Detection Using Arduino Nano and 16×2 LCD

This project uses a PIR (Passive Infrared) sensor, an Arduino Nano, and a 16×2 LCD to detect movement.

When the PIR sensor detects a person or movement, it sends a signal to the Arduino Nano. The Arduino then displays the motion status on the LCD.

Arduino Nano

deshbot shield

PIR sensor (HC-SR501)

16×2 LCD

USB cable

The PIR sensor detects changes in infrared radiation caused by moving objects, especially people.

1. HIGH → Motion detected
2. LOW → No motion detected

The Arduino reads the PIR output through D9 and displays the result on the 16×2 LCD.

When movement is detected, the LCD displays:

When there is no movement, it displays:

1. Security alarm systems
2. Automatic lighting systems
3. Smart-home projects
4. Motion detection systems
5. Room occupancy detection
6. Automatic door systems