// motion
HC-SR501 (PIR)
Passive infrared motion detector
€2.80
avg eur
no image
Digital
Pins
3
Specs
4
Libraries
1
Protocols
1
// wiring → esp32 devkit v1
3V3
EN
GPIO36
VP
GPIO39
VN
GPIO34
GPIO35
GPIO32
GPIO33
GPIO25
GPIO26
GPIO27
GPIO14
GPIO12
GND
GND
OUT
GPIO13
ESP32
WROOM-32
devkit v1
USB
VIN
5V
VCC
GND
GPIO23
GPIO22
SCL
GPIO1
TX0
GPIO3
RX0
GPIO21
SDA
GPIO19
MISO
GPIO18
SCK
GPIO5
SS
GPIO17
TX2
GPIO16
RX2
GPIO4
GPIO2
GPIO15
sensor pin (left)
sensor pin (right)
unused
// pinout → esp32
| Sensor Pin | ESP32 Connection |
|---|---|
| VCC | 5V (VIN) |
| OUT | GPIO 13 |
| GND | GND |
// technical specs
Range
3–7 m
Angle
~110°
Delay
adjustable 0.3s–5min
Voltage
5–20V (has reg)
// github libraries
// notes & warnings
OUT is 3.3V — safe. Two trim pots: sensitivity + delay. Set jumper to repeatable mode for retriggering.
// related sensors · motion
Submitted by caio.ricciuti@outlook.com
· Apr 26, 2026