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 space with motion that moves you!

VERSATILE INDOOR USE - Compact wall-mount sensor ideal for smart security, lighting, and automation in professional spaces.
ENERGY EFFICIENT DESIGN - Consumes less than 50µA in standby, ensuring minimal power drain for long-term use.
CUSTOMIZABLE DELAY TIMER - Adjust delay from 0.5 to 200 seconds to perfectly sync with your smart home or DIY projects.
PLUG PLAY COMPATIBILITY - Ready for Arduino and Raspberry Pi integration, empowering your next innovative project.
PRECISION MOTION DETECTION - Detects human movement up to 21 feet with a wide <100° cone angle for seamless automation.

The HC-SR501 PIR Infrared Motion Sensor is a high-precision, energy-efficient module designed for seamless integration with Arduino and Raspberry Pi. Featuring an adjustable delay timer (0.5-200s), a 21-foot detection range, and ultra-low standby current (<50µA), it’s perfect for smart home automation and professional indoor security setups.

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Brand	Stemedu
Color	Green, White, Yellow
Power Source	Electric
Item Weight	60 Grams
Maximum Range	21 Feet
Mounting Type	Wall Mount
Compatible Devices	Arduino, Raspberry Pi
Recommended Uses For Product	Indoor
Upper Temperature Rating	30 Degrees Celsius
Manufacturer	Stemedu
UPC	747356632386
Part Number	ST0057X5
Item Weight	2.12 ounces
Product Dimensions	7.87 x 3.15 x 5.91 inches
Item model number	3216550596
Is Discontinued By Manufacturer	No
Item Package Quantity	1
Batteries Included?	No
Batteries Required?	No

5pcs HC-SR501 PIR Infrared Motion Sensor Human Body IR Movement Detector Sensor Module for Arduino for Raspberry Pi

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