experimental code in C

[swapan]

Hi Friends

Following various codes in C published in this forum and gaining a little knowledge I have started a small project for experiment. Please see the code

void main_check();
int adc_main, old_value, difference_value;
void main() {

 TRISIO = 0x9;
 GPIO = 0;
 CMCON  = 7;
 ANSEL  = 1;
 GPIO.GP2 = 0;
 
 adc_main = ADC_Read(0);
 if (adc_main > 900) {
 GPIO.GP1 = 1;            // High Indication LED ON
 GPIO.GP4  =0;             //Low  Indication LED  OFF
 GPIO.GP5 =0;              //Normal Indication LED  OFF
 GPIO.GP2= 0;                //RELAY  OFF
 old_value = adc_main;  // To record present value.
                      }
 else if (adc_main < 560) {
 GPIO.GP1 = 0;              // High Indication LED  OFF
 GPIO.GP4  =1;              // Low  Indication LED   ON
 GPIO.GP5 =0;               // Normal Indication LED  OFF
 GPIO.GP2= 0;                 //RELAY  OFF
 old_value = adc_main;    // To record present value
                          }
 else  {
 GPIO.GP1 = 0;           // High Indication LED  OFF
 GPIO.GP4  =0;            // Low  Indication LED  OFF
 GPIO.GP5 =1;            // Normal Indication LED  ON
 Delay_ms(1000);
 Delay_ms(1000);
 Delay_ms(1000);
 Delay_ms(1000);
 Delay_ms(1000);
 
 GPIO.GP2= 1;           //RELAY ON

       }
 do       {
 main_check();
  }while (1);

}

void main_check() {
adc_main =  ADC_Read(0);
if (adc_main > old_value)  {
difference_value = adc_main - old_value;
                           }
else    {
difference_value = old_value - adc_main;
        }
if (difference_value >= 100) {        // Hysteriasis 
if (adc_main > 900) {
 GPIO.GP1 = 1;            // High Indication LED ON
 GPIO.GP4  =0;            //Low  Indication LED  OFF
 GPIO.GP5 =0;             //Normal Indication LED  OFF
 GPIO.GP2= 0;               //RELAY  OFF
 old_value = adc_main;  // To record present value.

                     }
 else if (adc_main < 560) {
 GPIO.GP1 = 0;               // High Indication LED  OFF
 GPIO.GP4  =1;               // Low  Indication LED   ON
 GPIO.GP5 =0;                // Normal Indication LED  OFF
 GPIO.GP2= 0;                //RELAY  OFF
 old_value = adc_main;    // To record present value

                          }
 else {
 GPIO.GP1 = 0;            // High Indication LED  OFF
 GPIO.GP4  =0;            // Low  Indication LED  OFF
 GPIO.GP5 =1;             // Normal Indication LED  ON 
 GPIO.GP2= 1;               //RELAY ON
old_value = adc_main;    // To record present value
      }
   }
 }

As per code it was intended when supply is applied first time and the value of applied signal at AN0 is within normal range, a delay of 5 seconds will be there to activate the Relay. But in practice it is seen that the Relay operates almost at the moment supply is made through. I have used delay upto 10 seconds. But the result is same.

Help is earnestly requested to point the fault out.


swapan

 

[doraemon]

Hello!

As you don't provide schematics, we cannot check how the relay is wired and therefore
cannot reply to your question.
Does your relay signal power a transistor? Is it a low side or high side transistor?
Etc...
You may try to use the debugger, set the relay signal to 1, see what happens, then set it to 0.


Dora.