The PIR (Passive Infrared) sensor continuously monitors its field of view for changes in infrared radiation emitted by moving bodies. When motion is detected, the sensor's output pin goes high, sending a trigger signal to the Arduino Nano. The Arduino then activates the connected LED lights via a digital output pin for a predefined duration before automatically turning them off.
Why Build This
Create a low-cost, energy-efficient automated lighting solution
Enhance home security in hallways, entryways, or outdoor areas
Great introductory project for beginners learning Arduino programming and sensors
Real-World Application
This automated lighting mechanism is widely used in real-world security lights, automatic hallway night lamps, energy-efficient corridor lighting, and hands-free architectural illumination.
Skills You'll Learn
Connecting and reading data from a PIR motion sensor
Controlling LEDs via digital output pins
Writing basic Arduino timing and logic sketches
Wiring basic circuits on a breadboard
Safety Precautions
Always double-check your circuit wiring and power connections before plugging in the Arduino Nano to avoid short circuits. Ensure correct polarity when connecting the LED and make sure you use an appropriate current-limiting resistor to prevent burning out the LED component. Disconnect power from the circuit whenever making physical wiring adjustments on the breadboard.
Technology Tags
ARDUINO NANO
PIR SENSOR
HC-SR501
LED
RESISTOR
BREADBOARD
Frequently Asked Questions
Yes, but you will need to use a transistor or relay module to drive higher-current loads, as the Arduino digital pins cannot supply enough current for multiple high-power LEDs directly.
You can adjust the time delay either directly using the onboard potentiometer on the HC-SR501 PIR sensor or by modifying the delay parameters in the Arduino code.
The HC-SR501 typically has an adjustable detection range of up to 7 meters and a viewing angle of approximately 110 degrees.
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