Attributes

Brand	-
Category	Robotics / STEM Teaching Tools / Sensors
Origin	-
Model Number	SR602
Sensor Type	Pyroelectric Infrared (PIR)
Detection Angle	100 degrees cone angle
Operating Voltage	3.0V to 5.0V DC
Static Current	< 50uA
Trigger Mode	Repeatable trigger (H) and Unrepeatable trigger (L)
Delay Time	Adjustable via potentiometer (approx. 5s to 300s)
Block Time	Fixed at 2.5 seconds (default)
Dimensions	23mm x 17mm x 10mm
Application	Automatic lighting, toy activation, security alarms

6 reviews

Anonymous

Mar 22, 2026

Rating: 5/5

Perfect for my Arduino project

This SR602 module is incredibly small and fits perfectly into my compact enclosure. The sensitivity is great, and it detected motion reliably from about 4 meters away. Easy to wire up with just VCC, GND, and OUT.

Anonymous

Mar 13, 2026

Rating: 5/5

Tiny but mighty

I was surprised by how small this is compared to the standard HC-SR501. It consumes very little power, which is crucial for my battery-operated robot. Highly recommended for embedded systems.

Anonymous

Mar 12, 2026

Rating: 3/5

Works, but range is limited

The sensor works as described, but don't expect long-range detection like larger modules. For close proximity tasks (under 3 meters), it is excellent. Just manage your expectations regarding distance.

Anonymous

Mar 10, 2026

Rating: 5/5

Great for beginners

Very straightforward to use. I connected it to a simple relay module and an LED strip. No complex coding required if you just want a basic motion-activated switch. Instructions online are plentiful.

Anonymous

Mar 07, 2026

Rating: 4/5

Good value but needs calibration

Works well once you tweak the two potentiometers on the back. Initially, it was too sensitive to ambient heat changes, but after adjusting the delay and sensitivity, it works flawlessly for my hallway light.

Anonymous

Mar 02, 2026

Rating: 4/5

Solid performance

Used this to automate a pet feeder. The form factor allowed me to hide it easily inside the casing. It has been running for three weeks without any false triggers. Good build quality.

5 FAQ

Q: Can this sensor detect motion through glass?

A: No, PIR sensors generally cannot detect infrared radiation through standard glass as it blocks the specific wavelengths required for detection. You would need to mount it with a clear line of sight or use a specialized IR-transmissive window.

Q: Does this come with a Fresnel lens?

A: Yes, the module comes pre-assembled with a small white dome Fresnel lens attached directly over the pyroelectric sensor element. This lens focuses the infrared energy onto the sensor to improve detection angles.

Q: How do I adjust the detection distance?

A: You can adjust the sensitivity using the smaller potentiometer labeled 'S' on the board. Turning it clockwise usually increases sensitivity (and effective range), while counter-clockwise decreases it. Note that physical obstructions and ambient temperature also affect range.

Q: What is the difference between H and L trigger modes?

A: In 'H' (Repeatable) mode, the output stays high as long as motion is continuously detected. In 'L' (Unrepeatable) mode, once triggered, the output goes high for the set delay time regardless of whether motion continues, ignoring new triggers during that block time.

Q: Is this compatible with 3.3V microcontrollers like ESP32?

A: Yes, the SR602 operates within a voltage range of 3.0V to 5.0V, making it fully compatible with 3.3V logic microcontrollers such as the ESP32 or ESP8266 without needing a level shifter.

Explore your interests

STC32G12K128 STC8H8K64U Microcontroller Small System Core Board Development Board Emulator

$16.50

Youxin Electronics_STM32H743IIT6 Core Board System Board Learning Board STM32 Development Board

$118.00

Arduino DUE Development Board 32-bit ARM Controller A000062 Italian Official Original Import with Cable

$299.00

Ultrasonic Sensor HC-SR04 Ultrasonic Distance Measuring Module Bracket US015-025-026-100

$3.16

Serial SHT20 Chip Temperature and Humidity Sensor Test, SHT30 Chip Measurement and Monitoring Module by Viter Intelligence

$11.00

High-Speed Yabo Smart Raspberry Pi 4B Motherboard Development Board Accessories RaspberryPi 2G/4G/8G RAM Py

$494.30

Magnetic Circular Counting Chips, Two-Sided Flip Coins for Elementary Math, Kindergarten Early Education, Ten-Frame Matrix, Addition/Subtraction within 10 & 20, Teaching Tools

$11.90

3-Wire/4-Wire Flame Sensor Module, Fire Source Detection with IR Receiver, Flame Detection and Alarm

$1.08

SANSI White Label Class A Glass Graduated Cylinder C18 Micro-Precision Demulsification Cylinder with Scale Measurement Includes Certificate Ground Joint Stopper Hexagonal Bottom Borosilicate Glass Lab Equipment

$3.68

EV2400 Battery Unlock Fuel Gauge Programmer MSP430 HPA500 Evaluation Module Interface Board SMBus

$323.00

Cube Three-View Teaching Aid with Grid - 3D Geometry Observation Tool for Grades 4-5 Math (2cm Cubic Blocks Set)

$15.10

OrangePi Orange Pi Zero3 Zero 3 Development Board Allwinner H618 Orange Pi

$228.00

Digital 38KHz Infrared Receiver Transmitter Head Sensor Module Electronic Building Blocks Robot Infrared Communication Remote Control

$2.29

12V Stable Version Light-Control Switch No-Light Sensing with Extension Cable Photoresistor Plus Relay Module

$49.20

STM32 Smart Car 51 Microcontroller Arduino Obstacle Avoidance Chassis Kit Mecanum Wheel Robot Car

$40.80

Tech Small Production Small Invention DIY Piano Electronic Keyboard Real Playable Science Small Handmade DIY Materials

$33.00

HX711 Pressure Sensor Module Electronic Scale Bracket Weighing DIY Scale Pan Tray Set 5/10/40kg200

$3.28

Transparent 3D Geometric Model Perspective Decomposition Graphic Teaching Aid, Complete Set for Elementary Grades 1-6 Math

$6.80

Thin Film Pressure Sensor Display, USB Rechargeable Flexible Resistive Pressure Digital Display Module, Wide Range Wireless

$20.00

E18-D80NK Infrared Photoelectric Switch Diffuse Reflection Obstacle Avoidance Sensor Module 3-80CM

$12.60

LAN8720 Module Network Module Ethernet Transceiver RMII Interface Development Board Xinwei Electronics

$7.85

STC15W408AS Core Board Minimum System Board 51 Microcontroller Development Board TTSOP20 Learning Board

$18.47

New Version MEGA2560 R3 Development Board, Improved MEGA2560 R3 with Sensor Expansion Board

$13.68

Gradient Visual Illusion Kit: Electric Rotating Assembly Toy for Maker DIY, Paintable Handmade Model

$8.72

51/AVR Microcontroller Core Development Board STC89C52RC/51MCU Experiment Board/ATMEGA32 Learning Board

$37.90

[Trial Pack] Xianlang Complete Cat Treat Sticks Meal Packs Main Course Cans Freeze-Dried Cat Food Sample Snacks Gift Set

$15.00

5A Range Current Transformer Module Voltage Sensor Single-Phase AC Active Output Current Transmitter

$5.06

Foldable Clothes Drying Rack Floor Standing Home Balcony Bedroom Hanging Clothes Quilt Drying Artifact Outdoor Cooling Rod Indoor Drying Rack

$47.10

Metal Detector Module Non-Contact Metal Induction Sensor Detection Module Metal Detector

$8.70

RV1103 Miniature Linux Development Board: RISC-V Vision and AI with Ethernet Port

$53.10

For Arduino Development Board R3 Mainboard Microcontroller Module Kit Programming Learning Board Sensor Suite

$78.00

Xuefen Geometry Stamping and Tracing Set for Grades 1-2, 3D and 2D Ink Pads, Math Learning Tools, Cube and Cuboid Models

$4.51

Rubber Tire Toy 4WD Smart Car Wheels Car Model Robot Accessories (Suitable for 2mm Axle)

$0.50

E18-D80NK Infrared Obstacle Avoidance Sensor Proximity Switch Smart Robot Car 10-80cm

$6.30

Digital 38KHz Infrared Receiver/Transmitter Head Sensor Module for Electronic Building Blocks Robots, Infrared Communication Remote Control

$2.80

51 MCU Minimum System STC89C52 DIP40 Through-Hole Smart Car Main Control Board Learning Experiment

$19.80

Outdoor Adventure Kids' Insect Observation Box with Magnifying Glass, Boys & Girls Toy for Exploration, Butterfly Catching and Fish Scooping Tools

$7.80

MPU-9255 9-Axis Attitude 3-Axis Electronic Compass Accelerometer Gyroscope Magnetic Field Sensor Module

$13.42

Freeze-Dried Chicken Treats for Dogs: Nutritious Weight-Gain Breast Meat Chunks for Puppies – Teeth Cleaning, Grain Mixing, Universal Use

$3.90

Ningbo Keli SQB Cantilever Beam Weighing Module Sensor 100kg 500kg 1t 2t 3 Ton Small Floor Scale Inductor

$48.00