[PIC] Stuck in pic18f4520 project for charging controller

[PIYUSH SONI]

Hi,
I am PIYUSH. I am working on a project to control the charger using pic microcontroller. I am using pic 18f4520 MCU and easy pic5 development board. I have taken 2 ADC channel and displaying the equivalent voltage on 4*16 LCD. Actually i want to display the difference of both channel in percentage.Help me so that i can solve my problem. I am also attaching my program code:-

sbit LCD_RS at RB5_bit;
 sbit LCD_EN at RB4_bit;
 sbit LCD_D4 at RB3_bit;
 sbit LCD_D5 at RB2_bit;
 sbit LCD_D6 at RB1_bit;
 sbit LCD_D7 at RB0_bit;
 sbit LCD_RS_Direction at TRISB5_bit;
 sbit LCD_EN_Direction at TRISB4_bit;
 sbit LCD_D4_Direction at TRISB3_bit;
 sbit LCD_D5_Direction at TRISB2_bit;
 sbit LCD_D6_Direction at TRISB1_bit;
 sbit LCD_D7_Direction at TRISB0_bit;

 char message1[] = "SPG SYSTEMS";
 char message2[] = "-----------";
 char message3[] = "DEVELOPED BY:-";
 char message4[] = "SPG INFOTECH LTD";
 char message5[] = "CH1=      VOLTS";
 char message6[] = "CH2=      VOLTS";
 char message7[] = "CHARGER OFF";
 char message8[] = "CHARGER ON";


 sbit Relay  at RA5_bit;
 sbit Buzzer at RA4_bit;
 char *temp = "00000";
 char *temps = "00000";
 unsigned int adc_value;
 unsigned int adc_valueV;
 unsigned int adc_values;
 unsigned int adc_valueVs;
 unsigned char VOLTS;

 void main()
  {
  OSCCON = 0b01111110;
  ANSEL =  0b00000011;
  ADCON0 = 0b00001000;
  ADCON1 = 0b00000000;
  CMCON = 7 ;
  TRISA = 0b00000011;
  TRISB = 0b00000000;
  Lcd_Init();

  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Cmd(_LCD_CURSOR_OFF);
  Lcd_Out(1,3,message1);
  Lcd_Out(2,3,message2);
  Lcd_Out(3,-3,message3);
  Lcd_Out(4,-3,message4);

  Delay_ms(3000);
  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Out(1,1,message5);
  Lcd_Out(2,1,message6);
  Lcd_Out(4,1,message7);
  Lcd_Out(4,1,message8);

  do
 {
    Delay_ms(1);
    Lcd_Out(1,1,message5);
    Lcd_Out(2,1,message6);
    adc_value = ADC_READ(1);
    Delay_ms(25);
    adc_valueV = adc_value*4.89;
    temp[0] = adc_valueV/1000 + 48;
    temp[1] = '.';
    temp[2] = (adc_valueV/100)%10 + 48;
    temp[3] = (adc_valueV/10)%10 + 48;
    temp[4] = adc_valueV%10 + 48;
    Lcd_Out(1,5,temp);


    adc_values = ADC_READ(0);
    Delay_ms(25);
    adc_valueVs  = adc_values*4.89 ;
    temps[0] = adc_valueVs/1000 + 48;
    temps[1] = '.';
    temps[2] = (adc_valueVs/100)%10 + 48;
    temps[3] = (adc_valueVs/10)%10 + 48;
    temps[4] = adc_valueVs%10 + 48;
    Lcd_Out(2,5,temps);
    Delay_ms(500);

   if((adc_valueV/666 >2.0) || (adc_valueVs/666 >2.0))
    {
     Relay = 0;

     Lcd_Out(4,0,message7);
     Lcd_Cmd(_LCD_CLEAR);
     Lcd_Out(4,0,message7);

     Buzzer =1 ;

     }
    else
    {
     Relay = 1;

     Lcd_Out(4,0,message8);
      Lcd_Cmd(_LCD_CLEAR);
     Lcd_Out(4,0,message8);
     Buzzer =0 ;
     }
    }while(1);

   } /*

Plz help me to display the difference b/w adc channel .

 

[jayanth.devarayanadurga]

To find difference you just take the difference of adc_val and adc_values.

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sbit LCD_RS at LATB5_bit;
sbit LCD_EN at LATB4_bit;
sbit LCD_D4 at LATB3_bit;
sbit LCD_D5 at LATB2_bit;
sbit LCD_D6 at LATB1_bit;
sbit LCD_D7 at LATB0_bit;
 
sbit LCD_RS_Direction at TRISB5_bit;
sbit LCD_EN_Direction at TRISB4_bit;
sbit LCD_D4_Direction at TRISB3_bit;
sbit LCD_D5_Direction at TRISB2_bit;
sbit LCD_D6_Direction at TRISB1_bit;
sbit LCD_D7_Direction at TRISB0_bit;
 
sbit Relay  at RA5_bit;
sbit Buzzer at RA4_bit;
 
char message1[] = "SPG SYSTEMS";
char message2[] = "-----------";
char message3[] = "DEVELOPED BY:-";
char message4[] = "SPG INFOTECH LTD";
char message5[] = "CH1=      VOLTS";
char message6[] = "CH2=      VOLTS";
char message7[] = "CHARGER OFF";
char message8[] = "CHARGER ON";
 
char temp[23];
char temps[23];
float adc_value;
float adc_valueV;
float adc_values;
float adc_valueVs;
unsigned char VOLTS;
 
void main(){
 
  OSCCON = 0b01111110;
  ANSEL =  0b00000011;
  ADCON0 = 0b00001000;
  ADCON1 = 0b00000000;
  CMCON = 7 ;
  TRISA = 0b00000011;
  TRISB = 0b00000000;
 
  Lcd_Init();
 
  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Cmd(_LCD_CURSOR_OFF);
  Lcd_Out(1,3,message1);
  Lcd_Out(2,3,message2);
  Lcd_Out(3,3,message3);
  Lcd_Out(4,3,message4);
 
  Delay_ms(3000);
 
  Lcd_Cmd(_LCD_CLEAR);
  Lcd_Out(1,1,message5);
  Lcd_Out(2,1,message6);
  Lcd_Out(4,1,message7);
  Lcd_Out(4,1,message8);
 
  do{
 
        Delay_ms(1);
        Lcd_Out(1,1,message5);
        Lcd_Out(2,1,message6);
        adc_value = ADC_READ(1) * 4.89;
        FloatToStr(adc_value, temp);
        Lcd_Out(1,5,temp);
 
 
        adc_values = ADC_READ(0) * 4.89;
        FloatToStr(adc_values, temps);
    
        Lcd_Out(2,5,temps);
    
 
        if(((adc_value / 666) > 2.0) || ((adc_values / 666) > 2.0))
        {
            Relay = 0;
 
            Lcd_Out(4,0,message7);
            Lcd_Cmd(_LCD_CLEAR);
            Lcd_Out(4,0,message7);
 
            Buzzer = 1 ;
 
        }
        else
        {
            Relay = 1;
 
            Lcd_Out(4,0,message8);
            Lcd_Cmd(_LCD_CLEAR);
            Lcd_Out(4,0,message8);
            Buzzer = 0 ;
        }
 
    }while(1);
 
   }

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[PIYUSH SONI]

@ jayanth :-Thanx for the help , I will try with this and let you know later.