KeyeStudio EASY PLUG Infrared Obstacle Avoidance Sensor – Adjustable 2cm to 40cm Robot Detector

The KeyeStudio EASY PLUG Infrared Obstacle Avoidance Sensor Module is designed for wheeled robots, line counters, obstacle avoidance cars, and proximity-triggered projects. It uses an infrared transmitter and receiver pair, then a comparator circuit to produce a TTL output when reflected IR light indicates an obstacle.

The current listing specifies 3.3V-5V operation, detection distance of 2cm to 40cm, effective angle of 35 degrees, and adjustable distance through a potentiometer. Use it with KeyeStudio EASY PLUG boards, robot motor drivers, or visual indicators such as the RGB Full Color LED Module.

Infrared reflection depends heavily on target color, surface finish, angle, and ambient light. Calibrate the potentiometer in the actual robot environment before relying on the threshold.

Technical Specifications

Board Layout & Label Guide

• IR Transmitter – Emits infrared light toward the target.
• IR Receiver – Detects reflected infrared light.
• Potentiometer – Adjusts detection distance threshold.
• EASY PLUG Port – Connection to compatible controller.
• Indicator LED – Shows obstacle state on many modules.
• Comparator Circuit – Converts reflection to TTL output.
• Angle Note – Keep target within the effective field.
• Surface Note – Black or angled surfaces may reduce reflection.

Application Scenarios

1. Arduino Digital Input Test

Read the obstacle output output and print its state.

const int sensorPin = 2;void setup() { Serial.begin(115200); pinMode(sensorPin, INPUT);}void loop() { Serial.println(digitalRead(sensorPin)); delay(100);}

2. LED Event Indicator

Turn on an LED when the module output is obstacle detected.

const int sensorPin = 2;const int ledPin = 13;void setup() { pinMode(sensorPin, INPUT); pinMode(ledPin, OUTPUT);}void loop() { digitalWrite(ledPin, digitalRead(sensorPin));}

3. MicroPython GPIO Monitor

Monitor the digital signal from a Pico-style board.

from machine import Pinimport timesensor = Pin(15, Pin.IN)while True: print(sensor.value()) time.sleep(0.1)

Packing List

• 1 x KeyeStudio EASY PLUG Infrared Obstacle Avoidance Sensor Module

FAQ

Q: What distance can it detect?
A: The listing specifies 2cm to 40cm.

Q: What voltage does it use?
A: DC 3.3V to 5V.

Q: Does color matter?
A: Yes, dark or non-reflective surfaces can be harder to detect.

Q: Can I adjust range?
A: Yes, use the onboard potentiometer.

Q: Is it analog?
A: The listing describes TTL output.

Q: Can it detect transparent objects?
A: Often poorly, depending on reflection.

Q: Can it be used for line tracking?
A: It can support simple black/white detection experiments.

Q: Why does sunlight affect it?
A: Ambient IR can interfere with reflection sensing.