====== Gestion de trois leds via bluetooth ======
Suite à notre découverte du module bluetooth [[tel0026]] et à un premier essais [[allumer une led via bluetooth]], continuons l'apprentissage en utilisant cette fois un [[https://www.dfrobot.com/wiki/index.php/Joystick_Module_For_Arduino_SKU:DFR0061|joystick]] d'un côté et trois leds de l'autre.

===== Mise en place ======
  * Arduino "master" : 
    * Une [[https://www.dfrobot.com/product-786.html|Dreamer Nano V4.1]] avec un ATmega32u4.
    * Avec un [[https://www.dfrobot.com/product-68.html|shield]].
    * Sur lequel on met un [[https://www.dfrobot.com/product-360.html|TEL0026]] et un [[https://www.dfrobot.com/wiki/index.php/Joystick_Module_For_Arduino_SKU:DFR0061|joystick]].

  * Arduino "slave" :
    * Une [[https://www.arduino.cc/en/Main/arduinoBoardMega2560|Arduino MEGA 2560]]
    * Avec un [[https://www.dfrobot.com/product-560.html|shield]]
    * Sur lequel on met trois [[https://www.dfrobot.com/product-490.html|LED]]s et on connecte un TEL0026.

<WRAP center round important 60%>
**TODO:** Ajouter photos!
</WRAP>

===== Code "Master" =====
<code c>
/* Minimal code for testing bluetooth module TEL0026 with a joystick

The circuit is based on Dreamer Nano V4.1, compatible Arduino Leonardo ( https://www.dfrobot.com/product-786.html ).
TEL0026 and button are plugged on Nano I/O Shield ( https://www.dfrobot.com/product-68.html )
 
Created 2017 by Simon Lefort.
*/

const int joyX = A0;
const int joyY = A1;
const int joyZ = 8; //button is on pin 8

byte joyXValue = 0;
byte joyYValue = 0;
byte joyZValue = 0;

void setup() {  
  Serial.begin(38400);   // Serial to talk with computer via USB
  Serial1.begin(38400);  // Serial to talk to bluetooth module TEL0026
}

void loop() {
  //lecture des capteurs
  joyXValue = analogRead(joyX) / 4; //équivalent à un map(valeur, 0, 1023, 0, 255)
  joyYValue = analogRead(joyY) / 4; 
  joyZValue = digitalRead(joyZ);
  
  //envoi
  Serial1.write("X");
  Serial1.write(joyXValue);
  Serial1.write("Y");
  Serial1.write(joyYValue);
  Serial1.write("Z");
  Serial1.write(joyZValue);
  Serial1.println();
  
  //debug
  Serial.print("X");
  Serial.print(joyXValue);
  Serial.print(" Y");
  Serial.print(joyYValue);
  Serial.print(" Z");
  Serial.println(joyZValue);
  
  delay(1000);
}
</code>

===== Code "Slave" =====
<code c>
/* Minimal code for testing bluetooth module TEL0026 with leds.

This program must be used with "bluetooth-TEL0026-commande-avec-joystick.ino".

The circuit is based on Arduino Mega 2560. TEL0026 and leds are plugged on a shield.
 
Created 2017 by Simon Lefort.
*/

int ledPinRed = 14;
int ledBrightX = 15;
int ledBrightY = 16;
int incomingByte = 0;
String chaine = "";

byte xValue = 0;
byte yValue = 0;
byte zValue = 0;

void setup() {
  Serial.begin(38400);  //communicate via USB
  Serial1.begin(38400); //communicate via Bluetooth
  
  digitalWrite(ledBrightX, LOW);
  digitalWrite(ledBrightY, LOW);
  digitalWrite(ledPinRed, LOW);
}

void loop() {  
  if (Serial1.available() > 0){
    incomingByte = Serial1.read();
    delay(20);
    chaine.concat(incomingByte);
    
    if (isAlpha(incomingByte)){
      Serial.write(incomingByte);
      Serial.print(" ");
      
      if(incomingByte == 'X'){
        xValue = Serial1.read();
        chaine.concat(xValue);
        Serial.println(xValue);
      }
      else if(incomingByte == 'Y'){
        yValue = Serial1.read();
        chaine.concat(yValue);
        Serial.println(yValue);
      }
      else if(incomingByte == 'Z'){
        zValue = Serial1.read();
        chaine.concat(zValue);
        Serial.println(zValue);
      }
    }
  }
  
  analogWrite(ledBrightX, xValue);
  analogWrite(ledBrightY, yValue);
  digitalWrite(ledPinRed, zValue);
  delay(50);
  
  if(chaine != "") {
    if(incomingByte == 10 || chaine.length() > 28){
      //Debug:
      Serial.println(chaine);
      
      chaine = "";
      xValue = 0;
      yValue = 0;
      zValue = 0;
    } 
  }
}

/* NOTES:
Ce qu'on lit dans le terminal série :
   
X 126
Y 129
Z 1
88126891299011310

*/
</code>