Scope of variables (or something else?)

[wirefree101]

G'day & Namate to All.

I appreciate the chance to submit a query here on this forum.

Any advice on why the following code always output a zero for the second Serial.println() in each of the two if, else blocks?

I hope that the previously stored value of either A1 or A2 pins is retained at every loop() call as the respective variables are declared out of scope.

const byte inputs[] = {A1, A2};
float milliVolt_A1 = 0;
float milliVolt_A2 = 0;
  
void setup()
{
  Serial.begin(115200);
  while (!Serial);
}
  
void loop()
{
    for (int pin = 0; pin < 2 ; pin++){
      int dummy = analogRead(inputs[pin]);  //read values twice as advise
      int value = analogRead(inputs[pin]);
      
      if (pin == 0){
        float milliVolt_A1 = (value/1023.0)*5*1000;
        Serial.print(milliVolt_A1);    
        Serial.print(",");
        Serial.println(milliVolt_A2);                //second println
      }
      
      else {
        float milliVolt_A2 = (value/1023.0)*5*1000;
        Serial.print(milliVolt_A2);    
        Serial.print(",");
        Serial.println(milliVolt_A1);          //second println
      }
            
      delay(1);
  }
}

[anon73444976]

@wirefree101

float milliVolt_A1 = (value/1023.0)*5*1000;

Lose the "float"

@wirefree101

G'day & Namate to All.

sp. "Naw, mate"

[groundFungus]

@wirefree101

I hope that the previously stored value of either A1 or A2 pins is retained at every loop() call as the respective variables are declared out of scope.

Either remove the float from inside the if block like @anon73444976 says so that the globally declared variables are used or do not declare them global and declare the variable that you wish to retain values static in their functions.

[wirefree101]

Namaste