Electrical – Project with wattmeter in proteus works and in practice there is difference of values

microchipproteus

in my project i'm using a current sensor ACS712 30A, for measuring current, i tested on proteus 8.6 sp3 and works ok, but in practice (using protoboard) the sensor it's accusing current without any loads connected. here's the part of my code that deals with the ACS712 obs: i'm measuring AC current and arbritering 220 V as voltage

    while(1)
    {
       char ACS[15];                      
       char Corrente [15];

       pino1 = 0;                        
       for (i = 0; i < samples; i++)    
       {
           pino1 = pino1+ ( ADC_Read(0) - 511.95  );      
       }
       current = pino1;
       current = current / samples;
       current = current * current;
       current = sqrt(current);
       current = current / 8.6f;                      

       FloatToStr(current, Corrente);

       potencia = ( current * 220 );                 
       FloatToStr(potencia, ACS); 
       Lcd_Cmd(_LCD_CLEAR);
       Lcd_Cmd(_LCD_CURSOR_OFF);                       
       Lcd_Out(1, 1, "AMP =");
       Lcd_Out(1, 7, Corrente);                             
       Lcd_Out(2, 1, "P =");
       Lcd_Out(2, 5, ACS);
       Lcd_Out(2, 16, "W");
    }

Best Answer

   pino1 = pino1+ ( ADC_Read(0) - 511.95  );

If ADC_Read(0) is 0 or not, pino1 = samples × -511.95. This will account for your numbers, which should equal 59.5A (assuming ADC_Read(0) = 0).

Additionally:

   current = pino1;
   current = current / samples;
   current = current * current;
   current = sqrt(current);
   current = current / 8.6f;

So current = current * current; and current = sqrt(current); do nothing.

I'll assume current = current / 8.6f;, factors out the -511.95.

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