Mini Basic PIR Sensor - BS412
100 units available with a short lead time.
A compact passive infrared (PIR) motion sensor that detects movement from approximately 3–8 metres away. Much smaller than standard PIR modules, making it ideal for unobtrusive, space-constrained projects. Fully self-contained — just needs power, ground, and a resistor to set the delay time.
Key Features
- 3.3 V Operation – Low-voltage, low-power motion detection
- ~5 m Detection Range – Effective from approximately 3–8 m with the snap-on lens
- 120° Detection Spread – Wide field of view
- Adjustable On-Time – From 2 seconds (0 V on pin 2) up to 1 hour (3.3 V) via resistor divider
- 4 × 3 mm Sensor Window – Compact BS-series sensing element
- Breadboard Friendly – Standard pin spacing for easy prototyping
Wiring
- Pin 1 → Ground
- Pin 2 → Ground (for 2-second on-time) or resistor divider (see datasheet for values)
- Pin 3 → 3.3 V
- Pin 4 → Signal output (3.3 V high/low)
Note: This sensor runs on 3.3 V. If interfacing with a 5 V microcontroller such as Arduino, power the sensor from the 3.3 V regulator, not the 5 V rail.
Resources
- PIR Sensor Tutorial (CircuitPython and Arduino code examples)
The Mini Basic PIR Sensor - BS412 appears in the following collections:
SKU AF-4666
by Adafruit
