Project29.Infrared Obstacle Avoidance Sensor Module
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Description
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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
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- 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
--------
.. image:: /img/connect/29_bb.png

Code
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.. code-block:: c

    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
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.. image:: /img/phenomenon/29.jpg