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

Product ID: 97026817

Details

Brand
Stemedu
Color
Green White
Item Weight
60 Grams
Maximum Range
21 Feet
Power Source
Electric

⏳0.5-200s adjustable delay

📡100° detection angle

🔋4.5-20V wide voltage range

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€ 20.46

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Sold byAmazon GreeceDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

🚀 Upgrade your smart space with motion that moves you!

LOW POWER EFFICIENCY - Consumes less than 50µA in standby, ensuring energy-efficient operation for continuous use.
CUSTOMIZABLE DELAY TIMER - Adjust delay from half a second to over 3 minutes to perfectly sync with your smart home needs.
PLUG PLAY COMPATIBILITY - Seamlessly integrates with Arduino and Raspberry Pi, empowering your DIY smart projects.
PRECISION MOTION DETECTION - Detects human movement up to 21 feet with a wide 100° cone angle for reliable activation.
VERSATILE WALL MOUNT DESIGN - Compact and lightweight (60g) sensor module fits discreetly in any home or office environment.

The Stemedu 5pcs HC-SR501 PIR Infrared Motion Sensor kit offers adjustable delay timing (0.5-200 seconds), a broad 100° detection angle, and low power consumption (<50µA). Compatible with Arduino and Raspberry Pi, these sensors enable precise, energy-efficient motion detection up to 21 feet, perfect for smart home automation and security projects.

Specifications

ASIN	B07KBWVJMP
Battery Description	battery not included
Best Sellers Rank	#36,714 in Electronics ( See Top 100 in Electronics ) #156 in Motion Detectors (Electronics)
Brand	Stemedu
Color	Green, White, Yellow
Compatible Devices	Arduino, Raspberry Pi
Customer Reviews	4.4 4.4 out of 5 stars (358)
Item Weight	60 Grams
Manufacturer	Stemedu
Maximum Range	21 Feet
Mfr Part Number	ST0057X5
Model Number	3216550596
Mounting Type	Wall Mount
Operating Temperature	30 Degrees Celsius
Power Source	Electric
Temperature Range	3E+1 Degrees Celsius
UPC	747356632386

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TrustScore 4.5 | 7,300+ reviews

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