can these be hooked in a circuit without an Arduino

I should think so. You just need a way of reading the values coming from the sensor to detect motion.

range please - how far away can it be from the surface that you are measuring?

Depends on the sensitivity setting. I have had no problems in the 2 to 3 meter range which is perfect for my uses. Also, this is an infrared sensor that senses motion, so if your surface is stationery, you might consider an ultrasonic sensor instead.

What is the field of view at 20 ft.?

It's pretty good, full range in 2 more feet

What are the dimensions of this? Specifically looking at the depth of the white dome and size of the white square. Trying to hide in woodworking.

From the dome top to the top of the square is .5" The square is .913" on a side

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HiLetgo 3pcs HC-SR501 PIR Infrared Sensor Human Body Infrared Motion Module for Arduino Raspberry Pi

Product ID: 256334295

Details

Brand
HiLetgo
Colour
white
Item weight
0.81 Ounces
Maximum range
2 Meters
Power source
DC Power

⏳<50µA ultra-low quiescent current

⚡4.5-20V wide voltage range

🎯<100° detection cone angle

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Description

🚀 Elevate your smart space with motion-sensing precision!

ENERGY EFFICIENT - Consumes less than 50µA in standby, maximizing power savings for long-term deployments.
SEAMLESS INTEGRATION - Plug-and-play compatibility with Arduino & Raspberry Pi for effortless smart projects.
VERSATILE APPLICATIONS - Ideal for smart lighting, security alarms, automated doors, and industrial control—upgrade any space instantly.
CUSTOMIZABLE DELAY TIMER - Adjustable trigger delay from 0.xx seconds up to 200 seconds to tailor response times perfectly.
PRECISION MOTION DETECTION - Detects human presence within a 2-meter range and a 100° cone angle for reliable automation.

The HiLetgo HC-SR501 PIR Infrared Sensor is a compact, energy-efficient motion detection module compatible with Arduino and Raspberry Pi. Operating between 4.5V and 20V with ultra-low standby current, it offers a 2-meter detection range and a 100° sensing angle. Its adjustable delay timer and reliable trigger modes make it perfect for smart home automation, security systems, and industrial applications.

Specifications

ASIN	B07KZW86YR
Antenna Location	Sidewalk, Driveway
Battery Description	Battery not included
Best Sellers Rank	#6,277 in Tools & Home Improvement ( See Top 100 in Tools & Home Improvement ) #10 in Motion Detectors
Brand	HiLetgo
Color	white
Compatible Devices	Arduino, Raspberry Pi
Customer Reviews	4.4 4.4 out of 5 stars (353)
Item Weight	0.81 Ounces
Manufacturer	HiLetgo
Maximum Range	2 Meters
Mfr Part Number	3-01-0120
Model Number	3-01-0120
Mounting Type	Wall Mount
Operating Temperature	50 Degrees Celsius
Power Source	DC Power Supply

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