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+/*
+  Esplora Led calibration
+ 
+ This  sketch shows you how to read and calibrate the light sensor.
+ Because light levels vary from one location to another, you need to calibrate the 
+ sensor for each location. To do this, you read the sensor for a few seconds,
+ and save the highest and lowest readings as maximum and minimum.  
+ Then, when you're using the sensor's reading (for example, to set the brightness
+ of the LED), you map the sensor's reading to a range between the minimum
+ and the maximum.
+ 
+ Created on 22 Dec 2012
+ by Tom Igoe
+ 
+ This example is in the public domain.
+ */
+
+#include <Esplora.h>
+
+// variables:
+int lightMin = 1023;        // minimum sensor value
+int lightMax = 0;           // maximum sensor value
+boolean calibrated = false;  // whether the sensor's been calibrated yet
+
+void setup() {
+  // initialize the serial communication:
+  Serial.begin(9600);
+
+  // print an intial message
+  Serial.println("To calibrate the light sensor, press and hold Switch 1");
+}
+
+void loop() {
+  // if switch 1 is pressed, go to the calibration function again:
+  if (Esplora.readButton(1) == LOW) {
+    calibrate();
+  }
+  // read the sensor into a variable:
+  int light = Esplora.readLightSensor();
+
+  // map the light level to a brightness level for the LED
+  // using the calibration min and max:
+  int brightness = map(light, lightMin, lightMax, 0, 255);
+  // limit the brightness to a range from 0 to 255:
+  brightness = constrain(brightness, 0, 255);
+  // write the brightness to the blue LED. 
+  Esplora.writeBlue(brightness);
+  
+  // if the calibration's been done, show the sensor and brightness
+  // levels in the serial monitor:
+  if (calibrated == true) {
+    // print the light sensor levels and the LED levels (to see what's going on):
+    Serial.print("light sensor level: ");
+    Serial.print(light);
+    Serial.print(" blue brightness: ");
+    Serial.println(brightness);
+  }
+  // add a delay to keep the LED from flickering:
+  delay(10); 
+}
+
+void calibrate() {
+  // tell the user what do to using the serial monitor:
+  Serial.println("While holding switch 1, shine a light on the light sensor, then cover it.");
+
+  // calibrate while switch 1 is pressed:
+  while(Esplora.readButton(1) == LOW) {
+    // read the sensor value: 
+    int light  = Esplora.readLightSensor();
+
+    // record the maximum sensor value:
+    if (light > lightMax) {
+      lightMax = light;
+    }
+
+    // record the minimum sensor value:
+    if (light < lightMin) {
+      lightMin = light;
+    }
+    // note that you're calibrated, for future reference:
+    calibrated = true;
+  }
+}
+
+
+
+
+
+
+
+