Atelier CAO

 /* Détection de volume Audio 
  Le circuit :
  http://design.ensa-nancy.net/detection-de-son
  http://www.arduino.cc/en/Tutorial/BlinkWithoutDelay
  */
 
 const int ledPin =  9;      // no du connecteur de led
 const int ledPin_1 =  2;      // no du connecteur de led
 const int ledPin_2 =  3;      // no du connecteur de led
 const int ledPin_3 =  4;      // no du connecteur de led
 const int ledPin_4 =  5;      // no du connecteur de led
 const int sensorPin = A0;
 
 long previousMillis = 0;
 int volume = 0;
 int volume_min = 1023;
 int volume_max = 0;
 int volume_interval = 2;
 boolean led_etat = false;
 int led_value = 0;
 long led_timer = 10000;
 long led_delay = 10;
 long prev_delay = 0;
 
 void setup() {
   Serial.begin(9600);
   pinMode(ledPin_1, OUTPUT);
   pinMode(ledPin_2, OUTPUT);
   pinMode(ledPin_3, OUTPUT);
   pinMode(ledPin_4, OUTPUT);
   digitalWrite(13, HIGH);
 
   // calibrate during the first five seconds 
   while (millis() < 5000) {
     volume = analogRead(sensorPin);
 
     // record the maximum sensor value
     if (volume > volume_max) {
       volume_max = volume;
     }
 
     // record the minimum sensor value
     if (volume < volume_min) {
       volume_min = volume;
     }
   }
   // signal the end of the calibration period
   digitalWrite(13, LOW);
   volume_interval = (volume_max - volume_min)/4;
   prev_delay = millis();
   Serial.println(volume_min);
   Serial.println(volume_max);
   Serial.println(volume_interval);
 }
 
 void loop() {
   volume = analogRead(sensorPin);
  
   if (volume > volume_min + volume_interval ) digitalWrite(ledPin_1, HIGH); else digitalWrite(ledPin_1, LOW);
   if (volume > volume_min + volume_interval * 2 ) digitalWrite(ledPin_2, HIGH); else digitalWrite(ledPin_2, LOW);
   if (volume > volume_min + volume_interval * 3) digitalWrite(ledPin_3, HIGH); else digitalWrite(ledPin_3, LOW);
   if (volume > volume_min + volume_interval * 4) digitalWrite(ledPin_4, HIGH); else digitalWrite(ledPin_4, LOW);  
  
   //int sensorValue = map(volume, volume_min, volume_max, 0, 255);
   //sensorValue = constrain(sensorValue, 0, 255);
   // fade the LED using the calibrated value:
   //analogWrite(ledPin, sensorValue);
   
   if ( volume >= volume_max){
     if (led_etat == false){
       led_etat = true;
       previousMillis = millis();
       prev_delay = millis();
       Serial.println(led_etat);
     }
   } else if (millis() - previousMillis > led_timer){
     if ( led_etat == true){
       led_etat = false;
       previousMillis = millis();
       prev_delay = millis();
       Serial.println(led_etat);
     }
   }
   if (millis() - prev_delay >= led_delay){
     Serial.println(led_value);
     if (led_etat == true) {
        if (led_value < 255) led_value++;
        analogWrite(ledPin, led_value);
     } else {
        if (led_value > 0) led_value--;
        analogWrite(ledPin, led_value);
     }
     prev_delay = millis();
   }
 }