#include <LiquidCrystal.h>
const byte Rly_Fan1 = 6; //Pin Relay Fan #1
const byte Rly_Fan2 = 7; //Pin Relay Fan #2
const byte Rly_Fan3 = 8; //Pin Relay Fan #3

unsigned long Dly_Periode = 5000;  // it's 5 min but I'm 5 seconds for the speed of the tests
unsigned long Millis_Now; // read millis = no
unsigned long previousMillis;

boolean Lock_Boucle = 0;
boolean Lock_Fan1 = 0;
boolean Lock_Fan2 = 0;
boolean Lock_Fan3 = 0;

float temp;

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {
//Serial.begin(9600);
lcd.begin (16, 2);
pinMode(Rly_Fan1, OUTPUT);
digitalWrite(Rly_Fan1, HIGH); //set a 0V
pinMode(Rly_Fan2, OUTPUT);
digitalWrite(Rly_Fan2, HIGH); //set a 0V
pinMode(Rly_Fan3, OUTPUT);
digitalWrite(Rly_Fan3, HIGH); //set a 0V

lcd.print ("T reel:");

}

void loop() {
temp = analogRead (0) ;
temp = temp / 2.06 ;
lcd.print ("temp:");

// the goal is simple: it is to make activate the 3 fans successively if tepm> 26

        // if tepm> 26 in active fan 1 then assist 5 min if the temperature is still> 26 in active fan 2 then assist 5 min if the temperature is still> 26 in active fan 3
        // but be careful if temp> 26 The temple counter does not start with the van 1 only starts with the fan 2 and 3

        // if tepm> 24 disables the 3 fans successively 3 then 2 then 1
        // but beware if temp <25 the first fan to turn off should not wait 5 min in all possible:

             // if temp <25 and the 3 fans are active so the 3 rd fan is the 1 st fan to turn off (in this case the 3 rd fan should not wait 5 min the other fans 2 and 1 wait 5 min then turn off if the temperature is still <24)
             // if temp <25 and two fans are active so the 2nd fan is the first fan to turn off (in this case the 2nd fan should not wait 5 minutes other fans in this case 1) wait 5 min and then get dry if the temperature is still <24)
             // if temp <25 and only one fan is active so the fan 1 will go directly without waiting 5 min


if (temp > 26 &&     Lock_Fan1 == 0) {            // Starting the fan # 1 the fan 1 of the spear without waiting 5000
digitalWrite(Rly_Fan1, LOW );                     // start fan1
 Lock_Fan1 = 1;
 previousMillis = millis();
  }

Millis_Now = millis();
if ((Millis_Now - previousMillis) >= Dly_Periode) {
if (temp > 26 && Lock_Boucle == 0 && Lock_Fan1 == 1 && Lock_Fan2 == 0) {                // Start Fan # 2                    after 5000 if the temperature is still> 26 start Fan # 2
digitalWrite(Rly_Fan2, LOW );                                                           // start fan1
Lock_Boucle = 1;
Lock_Fan2 = 1;
}

if (temp > 26 && Lock_Boucle == 0 && Lock_Fan1 == 1 && Lock_Fan2 == 1 && Lock_Fan3 == 0) {     // Start the Fan3            after 5000 if the temperare is still> 26 launches Fan # 2

digitalWrite(Rly_Fan3, LOW );                                                                 // Start the Fan3
Lock_Boucle = 1;
 Lock_Fan3 = 1;
previousMillis = millis ();
}
}

Millis_Now = millis();

if (temp <  24 &&   Lock_Fan1 == 1 && Lock_Fan2 == 1 && Lock_Fan3 == 1 ) {          // Stop Fan # 3 if the temperature is <24 and the 3 fans are successively off the fan 3 stop without waiting 5000
digitalWrite(Rly_Fan3, HIGH );                                                      // Stop Fan # 3
 Lock_Fan3 = 0;
  previousMillis = millis ();
 }
Millis_Now = millis();
if ((Millis_Now - previousMillis) >= Dly_Periode) {

if (temp <  24 && Lock_Boucle == 0 && Lock_Fan1 == 1 && Lock_Fan2 == 1 && Lock_Fan3 == 0 ) {      // Stop Fan # 2      if the temperature is still <24 and fan 3 is disable wait for 5000 then stop the fan 2
digitalWrite(Rly_Fan2, HIGH );                                                                    // Stop Fan # 2
Lock_Fan2 = 0;
}
if (temp <  24 && Lock_Boucle == 0 && Lock_Fan1 == 1 && Lock_Fan2 == 0 && Lock_Fan3 == 0 ) {      // Stop Fan # 1       if the temperature is still <24 and fan 3 and 2 are disabled in wait for 5000 and then stop the fan 1
digitalWrite(Rly_Fan1, HIGH );                                                                    // Stop Fan # 1
Lock_Boucle = 1;
Lock_Fan1 = 0;
previousMillis = millis ();
}
}



if (temp <  24 &&   Lock_Fan1 == 1 && Lock_Fan2 == 1 && Lock_Fan3 == 0 ) {                        // Stop Fan # 2        if the temperature is <24 and fans 1 and 2 are active fan 2 stop without waiting 5000
digitalWrite(Rly_Fan2, HIGH );                                                                    // Stop Fan # 2
 Lock_Fan2 = 0;
previousMillis = millis();
  }

Millis_Now = millis();
if ((Millis_Now - previousMillis) >= Dly_Periode) {
if (temp <  24 && Lock_Boucle == 0 && Lock_Fan1 == 1 && Lock_Fan2 == 0 && Lock_Fan3 == 0 ) {        // Stop fan # 1      if the temperature is still <24 and fan 1 only is active wait for 5000 and then stop the fan 1
digitalWrite(Rly_Fan1, HIGH );                                                                      // Stop fan # 1
Lock_Fan1 = 0;
previousMillis = millis();
}
}


if (temp <  24 &&   Lock_Fan1 == 1 && Lock_Fan2 == 0 && Lock_Fan3 == 0 ) {                         // Stop fan # 1         if the temperature <24 and fan 1 only is active stops fan 1 without waiting 5000
digitalWrite(Rly_Fan1, HIGH ); //Arret ventilateur.                                                 // when I add this condition of missing in the program in appear other defaults danc there are errors in the use of the function millis
 Lock_Fan1 = 0;                                                                                      // when I delete this condition (line 111 to 116) there is only the defals: if temp <24 and the 3 fan are active fan 3 and 2 stops directly at the same time then 5 min then the fan 1 s' stop
previousMillis = Millis_Now;
Lock_Boucle = 0;
}
delay (1000);
/* Fin Enpeche millis() de OVERFLOW */
}