Infrared Proximity Sensor Sharp GP2Y0A21YK

// demo sketch for connecting Infrared Proximity Sensor Sharp GP2Y0A21YK to Z-Uno

// pin connection to Sharp IR
#define PIN_SHARP A0

// supply voltage (if USB - 3.05 V)
float V = 3.05;

// the number of measurements for smoothing (averaging)
#define COUNT_AVERAGE 10

// set up channel
ZUNO_SETUP_CHANNELS(
    ZUNO_SENSOR_MULTILEVEL(ZUNO_SENSOR_MULTILEVEL_TYPE_DISTANCE,
                            SENSOR_MULTILEVEL_SCALE_METER,
                            SENSOR_MULTILEVEL_SIZE_TWO_BYTES,
                            SENSOR_MULTILEVEL_PRECISION_TWO_DECIMALS,
                            getterDistance)
         );

// here we will store the average analog value
int adistance;

// here we will store the value of the distance
float distance;

void setup() {
  Serial.begin();
  Serial.println("start");
}

void loop() {
    // obtain readings
    adistance = irRead();
    Serial.print("adistance = ");
    Serial.println(adistance);
    distance = getDistance(adistance);
    
    // sensor measuring range: 10-80 cm
    distance = min(distance, 80);
    distance = max(distance, 10);
    Serial.print("distance = ");
    Serial.println(distance);
    
    // send data to channel
    zunoSendReport(1);
    // every 30 second
    delay(30000);
}

// function analog value transformation to the distance (cm)
int getDistance(int avalue) {
    float volts; 
    
    volts = avalue * 0.0048828125 / 5 * V;
    Serial.print("volts = ");
    Serial.println(volts); 
    
    return 32 * pow(volts, -1.10);
}

// Obtain readings from the sensor and average to smooth
int irRead() {
    int averaging = 0;  // variable for adding data
    int avalue1;
    
    // We do COUNT AVERAGE measurement
    for (int i = 0; i < COUNT_AVERAGE; i++) {
        avalue1 = (float)(analogRead(PIN_SHARP));
        averaging = averaging + avalue1;
        delay(55); // Wait 55 ms before each reading
    }
    avalue1 = averaging / COUNT_AVERAGE; // get the average
    return avalue1;             
} 

word getterDistance() {
  return (word)distance;
}