{"title":"Mini Basic PIR Sensor - BL412","handle":"mini-basic-pir-sensor-bl412","url":"/products/mini-basic-pir-sensor-bl412","description":"The BL412 is a compact passive infrared (PIR) motion sensor designed for detecting movement from people and animals at distances of approximately 3–8 m. Much smaller than standard PIR modules, it is well suited for unobtrusive projects and fits easily on breadboards or perfboard.\n\nThe sensor runs on 3.3 V and requires only power, ground, and an optional resistor divider to set the output hold time — from 2 seconds (pin 2 tied to ground) up to one hour (pin 2 at 3.3 V). The digital signal output is 3.3 V high/low. The snap-on lens provides a 120° detection spread focused at approximately 5 m.\n\nKey Features\n\n\nCompact Size – Smaller than standard PIR modules for discreet installations\n\n3.3 V Operation – Low-voltage, breadboard-friendly\n\nAdjustable Hold Time – 2 seconds to 1 hour via resistor divider on pin 2\n\n120° Detection Angle – Wide field of view with snap-on lens\n\nSimple Wiring – Only 4 pins: GND, on-time, VCC, signal\n\n\nWiring\n\n\nPin 1 – Ground\n\nPin 2 – On-time control (ground for 2 s; resistor divider for longer delays)\n\nPin 3 – 3.3 V power\n\nPin 4 – Digital signal output (3.3 V high when motion detected)\n\n\nSpecifications\n\n\nModel – BL412\n\nSupply Voltage – 3.3 V\n\nDetection Range – Approximately 3–8 m (optimised at 5 m)\n\nDetection Angle – 120°\n\nOutput – Digital, 3.3 V high/low\n\nHold Time – 2 s to 1 hour (adjustable)\n\nSensor Window – 5 × 3.8 mm\n\n\nIdeal For\n\nMotion-activated lighting and alarms\nOccupancy detection projects\nLow-power battery-operated sensors\nArduino and Raspberry Pi motion sensing\n\n\n\nNote: This sensor operates at 3.3 V. When interfacing with a 5 V microcontroller like Arduino, power the sensor from the 3.3 V regulator.\n\n\nPackage Contents\n\n1× BL412 Mini PIR sensor with snap-on lens\n\n\nResources\n\nPIR Sensor Tutorial (Adafruit)\n","vendor":"Adafruit","product_type":"physical","in_stock":false,"options":[],"variants":[{"id":3857,"title":"Default Title","sku":"AF-4667","price":4.04,"on_sale":false,"in_stock":false,"available_quantity":0,"option1":"Default Title"}]}