PIR Motion Sensor Module HC-SR501
PIR Motion Sensor Module HC-SR501
PIR Motion Sensor Module HC-SR501
PIR Motion Sensor Module HC-SR501

PIR Motion Sensor Module HC-SR501

Sensors
DET506
Part.No: HC-SR501
€3.95
In Stock
Immediate Dispatch
HC-SR501 PIR Motion Sensor Module — detects human or pet movement up to 7 m with a 120° detection cone. Features adjustable sensitivity and delay, digital 3.3 V output, and operates on 5–12 V DC. Ideal for Arduino alarm, automation, and presence-detection projects.

 

The HC-SR501 PIR Motion Sensor Module (OEM) is a passive infrared detector designed to sense movement from humans or animals within a range of up to 7 metres and a 120° detection cone. It outputs a clean digital 3.3 V HIGH/LOW signal, making it immediately readable by any microcontroller. With an input supply range of 5–12 V DC and a standby current of just 60 mA, the HC-SR501 is one of the most popular motion-sensing modules for Arduino, ESP32, and Raspberry Pi projects.

Κey Features

  • Adjustable Sensitivity: on-board trimmer lets you tune the detection threshold → avoids false triggers
  • Adjustable Trigger Delay: second trimmer sets the output hold time (approx. 2–4 s) → controls how long the output stays HIGH after motion stops
  • Wide Supply Range (5–12 V DC): built-in voltage regulator handles various power rails → flexible for wall adapters, USB, or battery packs
  • 3.3 V Digital Output: direct compatibility with 3.3 V logic microcontrollers → no level-shifter needed for ESP32 or Raspberry Pi GPIO
  • Long Detection Range (7 m / 120°): covers an entire room from a corner mount → ideal for whole-room presence detection

Pinout & Wiring

PINSymbolDescription
1VCCPower supply input: 5–12 V DC
2OUTDigital output: 3.3 V HIGH when motion detected, LOW otherwise
3GNDGround

Wiring note: Connect VCC to your 5 V (or higher) rail, GND to common ground, and OUT to any digital input pin on your microcontroller. Because OUT is 3.3 V logic, it can be read directly by Arduino (treats ≥2 V as HIGH) or ESP32/Raspberry Pi without a level shifter.

Compatibility

  • Arduino UNO / Nano / Mega: Power from the 5 V pin; read OUT on any digital pin — fully compatible.
  • ESP32 / ESP8266: Power from 5 V (VIN); OUT at 3.3 V connects directly to GPIO — fully compatible.
  • Raspberry Pi: Power from 5 V header pin; OUT at 3.3 V connects safely to GPIO — fully compatible.

Typical Applications

  • Intruder alarm systems: trigger a buzzer or notification when unexpected motion is detected in a room
  • Automatic lighting control: turn lights on only when someone is present, saving energy
  • Smart home presence detection: feed occupancy data to Home Assistant, Node-RED, or similar platforms
  • Security camera activation: wake a camera or start recording only on detected movement
  • Low-power IoT nodes: use motion to wake a sleeping ESP32 and send an MQTT alert

Technical Specifications

ParameterValue
InterfaceDigital
Output Signal3.3 V HIGH / LOW
Input Voltage5–12 V DC
Typical Supply Voltage5 V DC
Operating Current60 mA
Detection RangeUp to 7 m
Detection Angle120°
Trigger DelayApprox. 2–4 s (adjustable)
SensitivityAdjustable via on-board trimmer
MPNHC-SR501

FAQ

Q: Can I use the HC-SR501 with a 3.3 V-only system?
A: The module requires at least 5 V on its VCC pin due to the internal regulator. However, the OUT signal is already 3.3 V, so 3.3 V microcontrollers (ESP32, Raspberry Pi) can read it directly. You need a 5 V power rail to drive the module itself.

Q: What do the two trimmers on the board do?
A: One adjusts detection sensitivity (distance), the other sets the output hold time — how long the OUT pin stays HIGH after motion is last detected (approximately 2–4 seconds in the default range).

Package Contents: 1 × HC-SR501 PIR Motion Sensor Module
⚠ Note: Ensure the module is powered from a 5–12 V supply. Do not connect VCC directly to a 3.3 V rail without bypassing the internal regulator, as this may result in unreliable operation.
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