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HC-SR501 PIR Motion Sensor

Sensor

Passive infrared (PIR) motion sensor that detects changes in the infrared radiation given off by people and animals. Sensitivity and hold time are set with the two trimmers on the board.

Specifications

Supply voltage

4.5 - 20V DC

Quiescent current

< 50 µA

Output

Digital, 3.3V (HIGH on motion)

Detection distance

3 - 7 m (adjustable)

Detection angle

< 120°

Hold time

~3 s - 5 min (adjustable)

Trigger mode

Single (L) / repeat (H), by jumper

Warm-up time

~1 min at power-up

Pins

VCC, OUT, GND

Shop prices

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• Robo90In stock53.57 ₺
• RobotistanIn stock54.91 ₺
• HobiDevreIn stock57.60 ₺
• Modül ElektronikIn stock58.15 ₺
• Direnc.netIn stock64.86 ₺
• RobotsepetiIn stock70.10 ₺
• MotorobitIn stock75.75 ₺
• Robolink MarketIn stock91.50 ₺
• Entegre DünyasıIn stock119.22 ₺
• F1 DepoOut of stock72.00 ₺

Prices read from the shops' pages on 22 October 2026. Prices and stock may have changed since; check at the shop before you buy.

Projects with this part

• Motion AlarmBeginner25 minA small home alarm that goes off when someone walks in: the HC-SR501 PIR sensor senses the change in the heat a human body gives off, the buzzer plays a two-tone siren and the red LED blinks; every alarm is counted in the Serial Monitor. It teaches reading a sensor's digital output, catching only the moment motion starts, sounding for a set time with millis(), and gathering the job into its own function. No extra library needed.Open project