Mini Basic PIR Sensor - BL412
Compact BL412 PIR motion sensor, self-contained with power, ground, and a resistor-set delay. Detects motion to ~5m; breadboard and perfboard friendly.
Pinout
- GND1
ground connection
Type · GroundVoltage · 0V - TIMEGND2
delay-time setting input; connect to ground for about 2 seconds per Adafruit product page
Type · Ground, AnalogVoltage · 0V to 3.3V timing input - 3.3V3
sensor power input
Type · PowerVoltage · 3.3V - SIGNAL4
PIR motion-detect output
Type · GPIOVoltage · 3.3V logic high/low
| Pin | Position | Type | Function | Voltage |
|---|---|---|---|---|
| GND | 1 | Ground | ground connection | 0V |
| TIMEGND | 2 | Ground, Analog | delay-time setting input; connect to ground for about 2 seconds per Adafruit product page | 0V to 3.3V timing input |
| 3.3V | 3 | Power | sensor power input | 3.3V |
| SIGNAL | 4 | GPIO | PIR motion-detect output | 3.3V logic high/low |
Pin details
4 connections- GND1
ground connection
GroundVoltage · 0V - TIMEGND2
delay-time setting input; connect to ground for about 2 seconds per Adafruit product page
Ground, AnalogVoltage · 0V to 3.3V timing input - 3.3V3
sensor power input
PowerVoltage · 3.3V - SIGNAL4
PIR motion-detect output
GPIOVoltage · 3.3V logic high/low
Start wiring
Analog · I2C · UART · 3.3 – 5 V · Breakout
Verify supply voltage and logic levels before powering up.
Module pins: 3.3V, GND. Schematik maps them to your board in the app.
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