Project29.Infrared Obstacle Avoidance Sensor Module

Description

The module has a pair of infrared LEDs, an emitter, and a receiver. The emitting LED sends infrared light pulses at a certain frequency. When the light hits an obstacle is reflected back to the receiver LED.

The KY-032 has 4 pins: GND, +, S (out), and EN. The jumper makes the module permanently enabled so it’s always detecting for obstacles. To control the state of the sensor remove the jumper and use the EN pin, a HIGH signal will enable the sensor and a LOW signal will disable it.

You can adjust the detection distance by turning the left knob, turn it to the middle for maximum distance. The right knob controls the frequency of the emitting IR pulse, turn it clockwise all the way to set the emitter to the right frequency required to work with the receiver.

Specification

  • Working voltage 3.3V – 5V DC

  • Working current ≥ 20mA

  • Working temperature -10°C – 50°C

  • Detection distance 2cm – 40cm

  • IO interface 4-wire interface (/EN/+/S/-)

  • Output signal TTL level (low level if obstacle detected, high if no obstacle)

  • Adjustment method multi-turn resistance adjustment

  • Effective angle 35°

  • Board Size 1.6cm x 4cm [0.62in x 1.57in]

  • Weight 9g

Connect

_images/29_bb.png

Code

int ledPin = 13;      // LED pin on arduino
int detectorPin = 3;  // obstacle avoidance sensor interface
int val;              // variable to store result
//int enablePin = 2;  // sensor enable interface (EN)

void setup()
{
pinMode(ledPin, OUTPUT);  // Define LED as output interface
pinMode(detectorPin, INPUT);  // Define obstacle avoidance sensor as input interface

// [uncomment and remove jumper on module to use enable pin (EN)]
//pinMode(enablePin, OUTPUT);
//digitalWrite(enablePin, HIGH);  // Enable sensor
}

void loop()
{
val = digitalRead(detectorPin); // Read value from sensor
if(val == LOW) // When the sensor detects an obstacle, the LED on the Arduino lights up
{
    digitalWrite(ledPin, HIGH);
}
else
{
    digitalWrite(ledPin, LOW);
}
}

Phenomenon

_images/29.jpg