Is there a place to add photo resistor in the board?

It's configured with a photo resistor so it doesn't trigger during daylight. In my application I want mine to trigger anytime someone enters the bathroom, so I jumped it out of circuit. If you hold the board with the potentiometers up there is a row of resistors just below them. The one on the right being the photo transistor. The the body is clear, so it can detect light, that makes it easy to spot. It's placement on the opposite side of the board than that of the sensor, kind of makes it worthless.

Is this affected by heat? i have an am312 that throws false positives when my hvac turns on.

Yes, the Passive InfraRed (PIR) sensor detects hot things moving. If your HVAC moves hot air in front of the detector, it should be detected.

What does it need to be powered up? like 5v 12v or ac voltage.

Hello, the operating voltage range of this HC-SR501 motion sensor is DC 4.5-20V

What is the spacing on the 3 header pins? (Ground, Signal, Power)

It is 2.54mm pitch on the 3 header pins. Thanks

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🚀 Elevate your smart projects with motion that moves you!

BULK PACK ADVANTAGE - Includes 5 sensors to scale your projects or security setups effortlessly.
COMPACT LIGHTWEIGHT - Only 60 grams with a sleek 20x8x15 cm design for easy wall mounting.
RELIABLE POWER SUPPLY - Corded electric source ensures uninterrupted performance without battery hassles.
PLUG PLAY INTEGRATION - Seamlessly connects with Arduino, Raspberry Pi, and home automation systems.
PRECISION MOTION DETECTION - Detects movement up to 21 feet for flawless automation and security.

The Stemedu HC-SR501 PIR Sensor is a high-precision infrared motion detection module designed for Arduino, Raspberry Pi, and home automation systems. With a maximum detection range of 21 feet, corded power supply, and compact design, this pack of 5 sensors offers reliable, scalable solutions for security and automation enthusiasts.

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Brand	Stemedu
Colour	Multi
Power Source	Corded Electric
Item Weight	60 Grams
Maximum Range	21 Feet
Mounting Type	Wall Mount
Battery Description	battery not included
Compatible Devices	Arduino, Raspberry Pi, Home Automation Systems, Security Systems
Product Dimensions	20D x 8W x 15H Centimeters
Manufacturer	Robocraze Banglore 9711444860, Stemedu
UPC	747356632386
Manufacturer	Stemedu
Country of Origin	India
Item model number	3216550596
ASIN	B07KBWVJMP

StemeduHC-SR501 PIR Sensor Infrared IR Body Motion Module for Arduino Raspberry Pi(Pack of 5pcs)

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