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RangingExample

int potPin = 0; // Analog input pin that the potentiometer is attached to int potValue = 0; // value read from the pot int led = 9; // PWM pin that the LED is on. n.b. PWM 0 is on digital pin 9 int led2 = 10; int rangedValue = 0;

void setup() {

  // initialize serial communications at 9600 bps:
  Serial.begin(9600); 

}

void loop() {

  potValue = analogRead(potPin); // read the pot value
  analogWrite(led, potValue/4);  // PWM the LED with the pot value (divided by 4 to fit in a byte)
  Serial.print("potValue = ");      // print the pot value back to the debugger pane
  Serial.print(potValue);      // print the pot value back to the debugger pane

// rangedValue = intRanger(originalMinimum,originalMaximum,newMinimum,newMaximum,valueToBeRanged)

  rangedValue = intRanger(320,840,0,255,potValue);

  analogWrite(led2, rangedValue);  // PWM the LED with the pot value (divided by 4 to fit in a byte)

  Serial.print("       rangedValue  = ");      // print the pot value back to the debugger pane
  Serial.print(rangedValue);      // print the pot value back to the debugger pane
  Serial.print("\n");  

 delay(10);                     // wait 10 milliseconds before the next loop

}

int intRanger( int originalMin, int originalMax, int newMin, int newMax, int currentValue) {

   long zeroRefOriginalMax =0;
   long zeroRefNewMax = 0; 
   long zeroRefCurVal = 0;
   int rangedValue = 0;

   	// Check for out of range currentValues
	if (currentValue < originalMin) {
		currentValue = originalMin;
	}
	if (currentValue > originalMax) {
		currentValue = originalMax;
	}


	// Zero Refference the values
	zeroRefOriginalMax = originalMax - originalMin;
	zeroRefNewMax = newMax - newMin;
	zeroRefCurVal = currentValue - originalMin;

	// Check for negative values and 0 max ranges
	if ( (zeroRefNewMax < 1) || (zeroRefOriginalMax < 1) || (originalMin < 0) || (originalMax < 1) || (newMin < 0) || (newMax < 1) || (currentValue < 0)  ) {
		return 0;
	}

	rangedValue =  ( (zeroRefCurVal * zeroRefNewMax) / zeroRefOriginalMax ) + newMin ;

        return rangedValue;

}