โมดูลวัดระยะแบบอินฟาเรด 10-80cm 2Y0A21 infrared distance sensor 10-80cm

/******** start code ********/
/*
 * created 2013-07-12
 * by lisper (leyapin@gmail.com)
 * function test gp2d12, read value from A0
 * 
 * VCC -- VCC 
 * GND -- GND 
 * Signal -- Analog 0 
 */

#define pin A0

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

void loop () {
uint16_t value = analogRead (pin);
uint16_t range = get_gp2d12 (value);
Serial.println (value);
Serial.print (range);
Serial.println (" mm");
Serial.println ();
delay (500);
}

uint16_t get_gp2d12 (uint16_t value) {
if (value < 10) value = 10;
return ((67870.0 / (value - 3.0)) - 40.0);
}

/******** end code ********/