IR Distance Sensor

/**

 * @file: blinking LED example

 * @date: 4/5/2011

 *

 * @DESCRIPTION

 * SHARP IR distance sensor, use correct cable! 

 * 

**/

#define IRpin 1 // analog pin for reading the IR sensor

//--- Function: Setup ()

void setup() 

{

     Serial.begin(9600); // start the serial port

}

//--- Function: Loop ()

void loop() 

{

     float stepsize = 5.0/1024; // 5V supply, value which is between 0 and 1023

     float volts = analogRead(IRpin)* stepsize; // value from sensor * stepsize

     float delta = (80-10)/2;                    // worked out from figure 2

     float distance = delta*pow(volts, -1.10); // theoretical distance / (1/Volts)S

     Serial.println(distance); // print the distance

     delay(100); // wait

}