/*
 * lecture des capteurs de temperature LM35
 */
/* -------------------------------------------------- */

#define NBVAL   4
#define DELAI   12000

/* -------------------------------------------------- */
void setup() {
  Serial.begin(9600);
  pinMode(LED_BUILTIN, OUTPUT);
  
  Serial.print("\n");
  /* XXX */
  /*  changing the voltage reference of the ADC
   *  greatly increase the prcision on the limited
   *  range of our temperatures.
   */
  analogReference(INTERNAL1V1); // Pour Arduino Mega2560
  
  delay(1000);
  Serial.print("M running\n");
}
/* -------------------------------------------------- */
/* ================================================== */
short adc_pins[] = { A0, A1, A2, A4 };
/* -------------------------------------------------- */
void updatevalues(short *ptr)
{
  int foo;
  digitalWrite(LED_BUILTIN, HIGH);
  for (foo=0; foo<NBVAL; foo++) {
    ptr[foo] = analogRead(adc_pins[foo]);
    delay(200);
    }
  digitalWrite(LED_BUILTIN, LOW);
}
/* -------------------------------------------------- */
void sendvalues(short *ptr)
{
  int foo;

  Serial.print("T");
  for (foo=0; foo<NBVAL; foo++) {
    Serial.print(" ");
    Serial.print(ptr[foo]);
    }
  Serial.print("\n");
}
/* -------------------------------------------------- */
void update_and_send(void)
{
  short values[NBVAL];
  
  updatevalues(values);
  sendvalues(values);
}
/* ================================================== */
void loop() {
  update_and_send();
  delay(DELAI);
}

/* -------------------------------------------------- */