Update 04.Analog/Calibrate.ino

Calibrate generated values beyond the from range of the map function and the behavior did not seem to match the spirit of the comments.

Author: zfields

build/shared/examples/03.Analog/Calibration/Calibration.ino

@@ -19,6 +19,8 @@
  By David A Mellis
  modified 30 Aug 2011
  By Tom Igoe
+ modified 07 Apr 2017
+ By Zachary J. Fields
 
  http://www.arduino.cc/en/Tutorial/Calibration
 
@@ -64,11 +66,11 @@ void loop() {
   // read the sensor:
   sensorValue = analogRead(sensorPin);
 
-  // apply the calibration to the sensor reading
-  sensorValue = map(sensorValue, sensorMin, sensorMax, 0, 255);
-
   // in case the sensor value is outside the range seen during calibration
-  sensorValue = constrain(sensorValue, 0, 255);
+  sensorValue = constrain(sensorValue, sensorMin, sensorMax);
+
+  // apply the calibration to the sensor reading
+  sensorValue = map(sensorValue, 0, 1023, 0, 255);
 
   // fade the LED using the calibrated value:
   analogWrite(ledPin, sensorValue);