BoardPilotHC-SR501 PIR motion sensor with ESP32
Supply 5 V
Bus GPIO
Measures motion
Pins and ESP32 wiring
| Pin | Role | ESP32 pin | Notes |
|---|---|---|---|
| VCC | Power | VIN | Needs 4.5 V or more: use VIN |
| OUT | Output (the part drives it) | D25 | 3.3 V HIGH when motion is detected, safe for the ESP32 |
| GND | Ground | GND |
Suggested wiring for the 30-pin ESP32 DevKit, avoiding flash, input-only and strapping pins. BoardPilot checks it for you as you wire.
This module is sold for 5 V. Its outputs may be 5 V: use a level shifter or a voltage divider on ESP32 inputs.
Starter code (Arduino)
void setup() {
Serial.begin(115200);
pinMode(25, INPUT); // OUT
}
void loop() {
Serial.println(digitalRead(25));
delay(100);
}Sources
- HC-SR501 PIR module manual, Supply 4.5 to 20 V; output 3.3 V HIGH / 0 V LOW
Try it in 3D in BoardPilot
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Part data: CC BY 4.0, free to reuse with credit to BoardPilot.