controller for detecting a digital input to RA0, RA1 & RA2

[Dhananjaya]

Hi i am having a problem with pic16f676 controller for detecting a analog input to RA0, RA1 & RA2  are connected to three analog  AC inputs 50 hz frequenncy, three phase voltages 440 volts i reduced ac voltages by connecting series resistors.   i ust i want its i/p coming or not (yes/No) 
 
i have declare the following steps if have any further steps please let me know…

 

#include<htc.h>

#define_XTAL_FREQ 4000000

__CONFIG(0x3FF4)

#define Rmain RA0;

#define Ymain RA1;

#define Bmain RA2;

#define RphaseLed RC0;

#define YphaseLed RC1;

#define BphaseLed R2

char RphaseFlag=0;

char YphaseFlag=0;

char BphaseFlag=0;

void main()

{

INTCON =0x00;
CMCON=0x07;
ANSEL=0x00;
TRISA=0b001111;
PORTA=0b001111;
TRISC=0b000000;
PORTC=0b000000; 

RphaseFlag=0;YphaseFlag=0;BphaseFlag=0;

while(1)

{

  if(Rmain ==1)

      RphaseFlag=1;

  

if(Ymain ==1)

      YphaseFlag=1;

 

if(Bmain ==1)

      BhaseFlag=1;

  

     if(RphaseFlag==1) RphaseLed=1;

 if(YphaseFlag==1) YphaseLed=1;

 if(BphaseFlag==1) BphaseLed=1;

}

}

its working good in only RA0 and RA1 but not working RA2 pin i think its comparator out put pin itd not detecting input AC voltage is there any other declaration please let me know…

I/O ports RA0/RA1/RA2 digital how to  defined by the ANSEL register.
The CMCON register, on the other hand, has 8 operating modes, which ALSO define the analog or digital function of each port.
My problem is that if I don't use the comparator, what mode should I use?
For example, if I want RA0 & RA1 and RA2 to be digital inputs,  – what value should I put in CMCON

Hi i am having a problem with pic16f676 controller for detecting a analog input to RA0, RA1 & RA2  are connected to three analog  AC inputs 50 hz frequenncy, three phase voltages 440 volts i reduced ac voltages by connecting series resistors.   i ust i want its i/p coming or not (yes/No) 
 
i have declare the following steps if have any further steps please let me know…

[Prabakaran P M]

If your aim is to check the input only, you can use transformer less AC to DC circuit and then a optocoupler to detect the input.

[Author]

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