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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;
- }
-}
-
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