http://arduino.cc/en/Tutorial/Calibration
This example code is in the public domain.
+ Schema: Schema: https://learn.adafruit.com/assets/460
*/
// These constants won't change:
const int sensorPin = A0; // pin that the sensor is attached to
-const int ledPin = 9; // pin that the LED is attached to
+const int ledPin = 11; // pin that the LED is attached to
// variables:
int sensorValue = 0; // the sensor value
void setup() {
// turn on LED to signal the start of the calibration period:
pinMode(13, OUTPUT);
+ pinMode(ledPin, OUTPUT);
digitalWrite(13, HIGH);
// calibrate during the first five seconds
if (sensorValue < sensorMin) {
sensorMin = sensorValue;
}
+ delay(5); // Let the sensor rest a bit and stabilize
}
// signal the end of the calibration period
void loop() {
// read the sensor:
sensorValue = analogRead(sensorPin);
-
+ // in case the sensor value is outside the range seen during calibration
+ sensorValue = constrain(sensorValue, sensorMin, sensorMax);
+
// 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);
+
// fade the LED using the calibrated value:
analogWrite(ledPin, sensorValue);
1. Modificare lo sketch in modo che modifichi la luminosita' di un led
via PWM tramite il valore letto dal sensore.
2. Come fare per costringere la variabile dentro un intervallo stabilito?
+*/