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

Product ID: 258956193

Details

Brand
Stemedu
Colour
Green
Item weight
60 Grams
Maximum range
21 Feet
Power source
Battery

⏳0.5-200s adjustable delay

⚡4.5-20V wide voltage range

📏21 feet max detection range

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3498 som

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Description

🚀 Elevate your smart space with motion-sensing precision!

CUSTOMIZABLE TIMING - Fine-tune your sensor’s response delay from half a second up to 200 seconds for perfect control.
SEAMLESS AUTOMATION - Instantly triggers devices from lights to alarms with precise motion detection.
VERSATILE DEPLOYMENT - Ideal for offices, hotels, warehouses, and smart homes—secure and automate any space with ease.
ENERGY EFFICIENT DESIGN - Ultra-low quiescent current (<50µA) keeps your system power-smart and reliable.
PLUG PLAY COMPATIBILITY - Effortlessly integrates with Arduino and Raspberry Pi for next-level DIY smart projects.

The HC-SR501 PIR Sensor Module is a high-performance infrared motion detector compatible with Arduino and Raspberry Pi, featuring a wide operating voltage (4.5-20V), adjustable delay timing (0.5 to 200 seconds), and a detection range up to 21 feet. Perfect for automating lighting, alarms, and appliances in professional and home environments, it offers low power consumption and easy setup, making it a must-have for smart security and automation projects.

Specifications

ASIN	B07KBWVJMP
ASIN	B07KBWVJMP
Battery Description	battery not included
Best Sellers Rank	#51,111 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #105 in Motion Detectors
Brand	Stemedu
Color	Green
Compatible Devices	Arduino, Raspberry Pi
Customer Reviews	4.4 4.4 out of 5 stars (336)
Customer reviews	4.4 4.4 out of 5 stars (336)
Date First Available	16 December 2018
Is Discontinued By Manufacturer	No
Item Weight	60 Grams
Item model number	3216550596
Manufacturer	Stemedu
Manufacturer	Stemedu
Maximum Range	21 Feet
Mfr Part Number	ST0057X5
Model Number	3216550596
Mounting Type	Wall Mount
Operating Temperature	30 Degrees Celsius
Power Source	Battery Powered
Product Dimensions	20 x 8 x 15 cm; 60 g
Temperature Range	3E+1 Degrees Celsius
UPC	747356632386
Upper Temperature Rating	30 Degrees Celsius

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3498 som

Duties & taxes included

In stock

Sold byAmazon KyrgyzstanDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Kyrgyzstan.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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