Problem with fan [SOLVED]

[Enrico Pirola]

Hi Fernando, I have a problem with my fans .
As you explain in your website, I have connect two fans F12 Arctic Cooling at one transistor ULN2003A using the blu wire, but I have a problem: If the tempetarure of led is low under 35C the fans run at maximum and if the temperature is hight over 45 C the fans stopped. What is wrong?

Thank you

[Fernando Garcia]

Hi!

Which arduino pin is connected on ULN?

In the tab Ferduino change:

Code: Select all

byte fanSpeed = 0;         // PWM dos coolers


To:

Code: Select all

int fanSpeed = 0;         // PWM dos coolers


Best regards.

[Enrico Pirola]

I use pin 1 And pin 13

[Fernando Garcia]

Pin 1 to ULN and pin 13 to blue wire?

What's settings for fans (min. and max)?

Have you removed Serial.begin(38400) on setup()?

[Enrico Pirola]

Yes pin 1 ULN and pin 13 blu wire of fan.
Setting 30.5 and 40.5
I have not the Serial.begin(38400) on Setup

In my tab there are not :

Code: Select all

byte fanSpeed = 0;         // PWM dos coolers

Or

Code: Select all

int fanSpeed = 0;         // PWM dos coolers

But only these:

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//*****************************************************************************************
//************************ Variáveis de controle de velocidade dos coolers ****************
//*****************************************************************************************
float HtempMin = 30.5;    // Declara a temperatura para iniciar o funcionamento das ventoinhas do dissipador
float HtempMax = 40.5;    // Declara que as ventoinhas devem estar em sua velocidade máxima quando o dissipador estiver com 40°c

//*****************************************************************************************
//************** Variáveis temperárias de controle de velocidade dos coolers **************
//*****************************************************************************************
float HtempMin_temp = 0;    // Declara a temperatura para iniciar o funcionamento das ventoinhas do dissipador
float HtempMax_temp = 0;    // Declara que as ventoinhas devem estar em sua velocidade máxima quando o dissipador estiver com 40°c

//*****************************************************************************************

I must write it?

[Fernando Garcia]

So you haven't the latest version.
No need add this variable.

You did some change in the tab "parametros"?

Check if is of this way:

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  int tempval = int(tempH * 10);
  int 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);
  }


You need check the behaviour of your fan manually, connecting directly on 12V and see what's the speed when blue wire is connected on 5V and GND.

[Enrico Pirola]

Solved, i have changed as the following:

Code: Select all

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


[Fernando Garcia]

Thank you very much for your help.

[Ironic mode]