Problem with heater [SOLVED]

[Danilo Casteller]

hi

I'm new in the forum sorry for my english but I use google translator ...

I have a problem with the heater, when the temperature drops to below the set minimum level the relay becomes on but just reaches the minimum level becomes off without reaching the reference temperature.
in this way the relays are constantly changing state.
to remedy this problem is corrected to change the code so ??

Code: Select all

if (offTempC > 0)
  {
    if ((tempC > (setTempC + offTempC)))            // Liga o chiller
    {
      while(tempC)
      {
      bitWrite(status_parametros,0,1);
      digitalWrite(chillerPin, HIGH);
      }
    }
    if ((tempC < (setTempC - offTempC)))             // Liga o aquecedor
    {
      while(tempC)
      {
      bitWrite(status_parametros,1,1);
      digitalWrite(aquecedorPin, HIGH);
      }
    }
  }

thank you very much for your attention

danilo

[Fernando Garcia]

Hi!

It's completely wrong check this page: http://www.arduino.cc/en/Reference/While

You need work with this lines:

Code: Select all

if ((tempC > (setTempC + offTempC)))

if ((tempC < (setTempC - offTempC)))

Best regards.

[Danilo Casteller]

hi

I understand that there is a compilation error of the while statement.
is correct to use the while istruction or using this type of instruction there is a risk that the controller goes into an infinite loop?

I thought to correct the statement with these two.

Code: Select all

while((tempC < setTempC ))
while((tempC > setTempC ))

[Fernando Garcia]

Hi!

What are the values possible to tempC and setTempC?

Replace this values and tell me if will make what you want.

Best regards.

[Danilo Casteller]

hi Fernando

I now set so:

setTempC = 25.5
offTempC = 0.7

I wish that when the temperature of the aquarium (tempC) descends for example at 24.7 ° C the heater turning on and remain on until 25 ° .5 and not turn OFF as it happens now at 24.8 ° C.
my only fear is that during the entire period in which the heater is on the controller does not perform most other commands

[Fernando Garcia]

Hi!

You can't use a "while" on this case.

Try another method.

Best regards.

[Danilo Casteller]

hi fernando
let's see if this method can go .
I do not know anything about programming but I'm trying to apply myself to understand how to make and I hope also with your help

I defined three boolean variable is then thought to modify the code like this:

Code: Select all

 
 if (tempC < (setTempC + offTempC + alarmTempC) && tempC > (setTempC - offTempC - alarmTempC))
  {
    bitWrite(status_parametros,2,0);
  }

  if (alarmTempC > 0)                        // Aciona alarme
  {
    if ((tempC >= (setTempC + offTempC + alarmTempC)) || (tempC <= (setTempC - offTempC - alarmTempC)))
    {
      bitWrite(status_parametros,2,1);
    }
  }

  if ((tempC < (setTempC + offTempC)) && (tempC > (setTempC - offTempC)))          // Desliga aquecedor e chiller
  {
    bitWrite(status_parametros,0,0);
    bitWrite(status_parametros,1,0);
    digitalWrite(aquecedorPin, LOW);
    digitalWrite(chillerPin, LOW);   
  }

  if (offTempC > 0)
  {
    if ((tempC > (setTempC + offTempC)))            //   ocorre entre ligar o chiller
          {
            temperatura_max_set = true;
            temperatura_ok = false;
            temperatura_min_set = false;
           }
     
     
   
   
    if ((tempC < (setTempC - offTempC)))             // ocorre entre ligar o aquecedor
              {
                temperatura_min_set = true;
                temperatura_ok = false;
                temperatura_max_set = false;
              }
   
    if (temperatura_max_set == true)            // ocorre entre desligar o chiller
      {
         if ((tempC <= (setTempC)))
               {
                 temperatura_max_set = false;
                 temperatura_ok = true;
                } 
      }
    if (temperatura_min_set == true)
      {
        if ((tempC >= (setTempC)))             // ocorre entre desligar o aquecedor
            {
              temperatura_min_set = false;
              temperatura_ok = true;
             }
      }
   

 
    if (temperatura_max_set == true)            // Liga o chiller
    {
      bitWrite(status_parametros,0,1);
      digitalWrite(chillerPin, HIGH);
    }
    if (temperatura_min_set ==true)             // Liga o aquecedor
    {
      bitWrite(status_parametros,1,1);
      digitalWrite(aquecedorPin, HIGH);
    }
 

 if (temperatura_ok==true)                    //desliga o chiller e aquecedor
  {
    bitWrite(status_parametros,0,0);
    bitWrite(status_parametros,1,0);
    digitalWrite(aquecedorPin, LOW);
    digitalWrite(chillerPin, LOW);
  }
  }
  if ((tempC > 50) || (tempC <10))
  {
    bitWrite(status_parametros,0,0);
    bitWrite(status_parametros,1,0);
    digitalWrite(aquecedorPin, LOW);
    digitalWrite(chillerPin, LOW);
  }

  if ((bitRead(status_parametros, 0) == true) &&  (bitRead(status_parametros, 1) == true)) // Evita aquecedor e chiller ligados ao mesmo tempo.
  {
    bitWrite(status_parametros,0,0);
    bitWrite(status_parametros,1,0);
    digitalWrite(aquecedorPin, LOW);
    digitalWrite(chillerPin, LOW);
  }

  int tempval = int(tempH * 10);
  fanSpeed = map(tempval, (HtempMin * 10), (HtempMax * 10), 0, 255);       // Controle de velocidade das ventoinhas do dissipador
  if (fanSpeed < 0)
  { 
    fanSpeed = 0;
  }   
  if (fanSpeed > 255)
  {
    fanSpeed = 255;
  }
  analogWrite(fanPin, fanSpeed);

  if(tempH < HtempMin) // Desativa os coolers se a temperatura estive abaixo da mínima definida.
  {
    digitalWrite(desativarFanPin, LOW);
  }
  else
  {
    digitalWrite(desativarFanPin, HIGH);
  }
}