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A quick code question.

Former Member

I am trying to figure out how to write a code for multiple pots a high level set and a low level set to turn on a led for one the other or keep a middle one on if it doesnt hit either one I know it needs to be an if else code but dont know how to set it up exactly. can anyone help me?

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  • Are you controlling three digital potentiometers which in turn control the brightness of three leds?

    I don't understand high level set etc.   Do you have single variable, LevelValueInt, which determines which led is on?

    One of the syntactical tools to do that is http://www.arduino.cc/en/Tutorial/SwitchCase2.

    Nico has been discussing that here.

     

    -=Syntax Matters=-

  • in reply to billabott

    ok I should have been more specific. there are three levels and three leds anhigh level a safe level and a low level the leds are acting as indicators of which level it is on i want a pot set to which when the level gets above it it switches from the safe to the high and the same if it gets below the low set pot

  • in reply to Former Member

    Guess You want to do something like this: (this is just one possible solution)

     

    // Input Pins

    #define HI A1

    #define LO A2

    #define IN A0

    // Output Pins

    #define OVER 2

    #define UNDER 3

    #define SAFE 4

     

     

    int levelHi;

    int levelLo;

    int levelIn;

     

     

    void setup(){

      pinMode(OVER,OUTPUT);

      pinMode(UNDER,OUTPUT);

      pinMode(SAFE,OUTPUT);

    }

     

     

    void loop(){

      // Read Inputs

      levelHi=analogRead(HI);

      levelLo=analogRead(LO);

      levelIn=analogRead(IN);

      // Set Outputs

      if(levelIn>levelHi){

        digitalWrite(OVER,HIGH);

        digitalWrite(UNDER,LOW);

        digitalWrite(SAFE,LOW);

        goto done;

      }

      if(levelIn<levelLo){

        digitalWrite(OVER,LOW);

        digitalWrite(UNDER,HIGH);

        digitalWrite(SAFE,LOW);

        goto done;

      }

      // If we get here we are inside the two limiting levels - safe

      digitalWrite(OVER,LOW);

      digitalWrite(UNDER,LOW);

      digitalWrite(SAFE,HIGH);

      done:;

    }

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  • in reply to Former Member

    Guess You want to do something like this: (this is just one possible solution)

     

    // Input Pins

    #define HI A1

    #define LO A2

    #define IN A0

    // Output Pins

    #define OVER 2

    #define UNDER 3

    #define SAFE 4

     

     

    int levelHi;

    int levelLo;

    int levelIn;

     

     

    void setup(){

      pinMode(OVER,OUTPUT);

      pinMode(UNDER,OUTPUT);

      pinMode(SAFE,OUTPUT);

    }

     

     

    void loop(){

      // Read Inputs

      levelHi=analogRead(HI);

      levelLo=analogRead(LO);

      levelIn=analogRead(IN);

      // Set Outputs

      if(levelIn>levelHi){

        digitalWrite(OVER,HIGH);

        digitalWrite(UNDER,LOW);

        digitalWrite(SAFE,LOW);

        goto done;

      }

      if(levelIn<levelLo){

        digitalWrite(OVER,LOW);

        digitalWrite(UNDER,HIGH);

        digitalWrite(SAFE,LOW);

        goto done;

      }

      // If we get here we are inside the two limiting levels - safe

      digitalWrite(OVER,LOW);

      digitalWrite(UNDER,LOW);

      digitalWrite(SAFE,HIGH);

      done:;

    }

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