Infrared Distance Measuring Proximity Sensor 20 - 150cm - SHARP GP2Y0A02

The Sharp distance sensor's are a popular choice for many projects that require accurate distance measurements. This IR sensor is more economical than sonar range-finders, yet it provides much better performance than other IR alternatives. Interfacing to most microcontrollers is straightforward: the single analog output can be connected to an analog-to-digital converter for taking distance measurements, or the output can be connected to a comparator for threshold detection. The detection range of this version is approximately 20 cm to 150 cm (8" to 60"). For over 1 m distance, we suggest using sonar sensors.

Features:

• Infrared rangefinder: 20 cm to 150 cm (8" to 60")
• Analog Interface
• External control circuit is unnecessary
• Japanese Solderless Terminal (JST) Connector

Specifications:

• Distance measuring range: 20 - 150 cm (8" to 60")
• Maximum measurement angle: >40°
• Operating voltage: 4.5 V to 5.5 V DC
• Average power consumption : 35mA
• Peak power consumption : 50mA
• Frequency of updates/cycle : 25 Hz / 40ms
• Response time: 39 ± 10 ms
• Output type: Analog voltage (3.1V at 10cm to 0.55V > 80cm)
• Output voltage differential over distance range: 1.8 V (typical)
• Analog output noise : < 200 mV
• Weight: 3.5 g

Connect Sharp Infrared Distance Measurement to Arduino

// connect gp2d120x to A0

#define pin A0

void setup(){
   Serial.begin (9600);
   pinMode(pin, INPUT);
}

void loop(){
   uint16_t value = analogRead (pin);
   double distance = get_IR (value);  //Convert the analog voltage to the distance
   Serial.println (value);  //Print the data to the arduino serial monitor
   Serial.print (distance);
   Serial.println (" cm");
   Serial.println ();
   delay (500);   //Delay 0.5s
}

//return distance (cm)
double get_IR(uint16_t value){
   if (value < 16)  value = 16;
   return 9462.0 / (value - 16.92);
}