MeasureDistance.ino

/*
  MeasureDistance by Pedro A. Melendez
  based on Analog input, analog output, serial output by Tom Igoe
 
  Reads Analog input from proximity sensor, flicker the pin 13 LED with period of the sensor value in ms,
  and alsa maps the sensor value to the distance and sends the data via serial.
  
 */

// These constants won't change.  They're used to give names
// to the pins used:
const int proximitySensor = A0;  // Analog input pin that the potentiometer is attached to
const int ledPin = 13; // integrated LED on the Arduino Leonardo


int sensorValue = 0;  // value read from the proximity sensor
int distance = 0;

void setup() {
    // initialize serial communications at 9600 bps:
    Serial.begin(9600); 
    
    // initialize the led pin
    pinMode(ledPin, OUTPUT);
}

void loop() {
    // read the analog in value:
    sensorValue = analogRead(proximitySensor);
    
    // map read 10 bit value to distance range
    //~ distance = map(sensorValue, 634, 81, 4, 30);    // short distance sensor
    distance = map(sensorValue, 634, 81, 10, 80);   // medium distance sensor
    
    // turn on and off the LED using as interval the value of the sensor
    digitalWrite(ledPin, HIGH);
    delay(distance*2);
    digitalWrite(ledPin, LOW);
    delay(distance*2);

    // print the results to the serial monitor:
    Serial.print("sensor = " );                       
    Serial.print(sensorValue);      
    Serial.print("\t distance = ");      
    Serial.println(distance);   

    // wait 2 milliseconds before the next loop
    // for the analog-to-digital converter to settle
    // after the last reading:
    delay(2);                     
}