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[SOLVED] LCD to Display Voltage and temperature simultaniuosly

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Tamim Neak

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Hi all,

I have been working on the following code and running the simulation on Proteus:

Code: 
// ***************************************************************************
//  File Name        : newproject.c
//  Version          : 1.0
//  Description      : Pulse Width Modulation (PWM)
//                     ADC
//  Author(s)        : Tamim Neak
//  Target(s)        : PIC16F887
//  Programmer       : PICKit
//  Last Updated     : 14 Feb 2015
// ***************************************************************************

// LCD module connections
sbit LCD_RS at RC4_bit;
sbit LCD_EN at RC5_bit;
sbit LCD_D4 at RD1_bit;
sbit LCD_D5 at RD2_bit;
sbit LCD_D6 at RD3_bit;
sbit LCD_D7 at RD4_bit;

sbit LCD_RS_Direction at TRISC4_bit;
sbit LCD_EN_Direction at TRISC5_bit;
sbit LCD_D4_Direction at TRISD1_bit;
sbit LCD_D5_Direction at TRISD2_bit;
sbit LCD_D6_Direction at TRISD3_bit;
sbit LCD_D7_Direction at TRISD4_bit;
// End LCD module connections

unsigned int battery_voltage;
unsigned int output_voltage;
unsigned int output_current;
unsigned int temp;
float temp1;
float battery_voltage1;
char temper[7];
char battery_voltage2[7];
float x = 15.15;
void temp_read(void){
     temp = ADC_read(0);            // Get 10-bit results of AD conversion
     temp1 = (temp* 500./1023);
     if (temp > 56) PORTB.F1 = 1;   // cooling fan on
       else PORTB.F1 = 0;           // cooling fan off
     IntToStr(temp1,temper);
     lcd_out(1,6, Ltrim(temper));
     Lcd_Chr_Cp(0xdf);
     Lcd_Chr_Cp('C');
     Lcd_Chr_Cp(' ');
                     }

void battery_read(){
     battery_voltage = ADC_read(1);                       // Get 10-bit results of AD conversion
     battery_voltage1 = (battery_voltage* 15.15/1023);
     if (battery_voltage < 676) PORTB.F0 = 1;             // battery LED off
       else PORTB.F0 = 0;                                 // battery too low LED on
     IntToStr(battery_voltage1,battery_voltage2);
     lcd_out(1,6, Ltrim(battery_voltage2));
     Lcd_Chr_Cp('V');
     Lcd_Chr_Cp(' ');
                    }

void main() {
 ADCON1 = 0x00; // All channels are config as analog I/p.
 TRISA=0b00001111;
 TRISD.F0 = 1;       //Configure 1st bit of PORTD as input for power on
 TRISB = 0;          //Configure PORTB as output
 PORTB = 0;
 PORTD.F0 = 1;       //Switch off

adc_init();        // Initialize ADC module with default settings
Lcd_Init();                        // Initialize LCD
Lcd_Cmd(_LCD_CURSOR_OFF);          // LCD Cursor Off
Lcd_Cmd(_LCD_CLEAR);               // Clear display
lcd_out(1,1,"TEMP=");
lcd_out(1,11,"Bat=");

do {
   //output_voltage = ADC_read(3);
   //output_current = ADC_read(4);

   temp_read();
   battery_read();

battery_voltage = ADC_read(1);
   if ((PORTD.F0 == 0) && (battery_voltage > 676))  //If the switch is pressed
      {
       Delay_ms(100);    //Switch Debounce
       if ((PORTD.F0 == 0) && (battery_voltage > 676))        //If the switch is still pressed
          {
           PORTB.F2 = 1; //PWM LED ON
           Delay_ms(100);
           temp_read();
           }
       }else {
              PORTB.F2 = 0;    //PWM LED Off
              Delay_ms(100);
              }
    } while(1);
}

I have two problems:
1- I don't get any value for the Battery_voltage in the LCD.
2- When i run the code and make the battery_voltage less than 10V the led at PORTB.F0 keeps blinking instead of staying on till the battery_voltage > 10V.
any help regarding these issues are appreciated
 

I fixed the code here it is for those interested.

Code: 
// ***************************************************************************
//  File Name        : newproject.c
//  Version          : 1.0
//  Description      : Pulse Width Modulation (PWM)
//                     ADC
//  Author(s)        : Tamim Neak
//  Target(s)        : PIC16F887
//  Programmer       : PICKit
//  Last Updated     : 15 Feb 2015
// ***************************************************************************

// LCD module connections
sbit LCD_RS at RC4_bit;
sbit LCD_EN at RC5_bit;
sbit LCD_D4 at RD1_bit;
sbit LCD_D5 at RD2_bit;
sbit LCD_D6 at RD3_bit;
sbit LCD_D7 at RD4_bit;

sbit LCD_RS_Direction at TRISC4_bit;
sbit LCD_EN_Direction at TRISC5_bit;
sbit LCD_D4_Direction at TRISD1_bit;
sbit LCD_D5_Direction at TRISD2_bit;
sbit LCD_D6_Direction at TRISD3_bit;
sbit LCD_D7_Direction at TRISD4_bit;
// End LCD module connections

unsigned int battery_voltage;
unsigned int output_voltage;
unsigned int output_current;
unsigned int temp;
float temp1;
float battery_voltage1;
char temper[7];
char battery_voltage2[3];
float x = 15.15;
void temp_read(void){
     temp = ADC_read(0);            // Get 10-bit results of AD conversion
     temp1 = (temp* 500./1023);
     /*if (temp > 56) PORTB.F1 = 1;   // cooling fan on
       else PORTB.F1 = 0;           // cooling fan off*/
     IntToStr(temp1,temper);
     lcd_out(1,6, Ltrim(temper));
     Lcd_Chr_Cp(0xdf);
     Lcd_Chr_Cp('C');
     Lcd_Chr_Cp(' ');
                     }

void battery_read(){
     battery_voltage = ADC_read(1);                       // Get 10-bit results of AD conversion
     battery_voltage1 = (battery_voltage* 15.15/1023);
     //if (battery_voltage < 676) PORTB.F0 = 1;             // battery LED off
       //else PORTB.F0 = 0;                               // battery too low LED on
     FloatToStr(battery_voltage1,battery_voltage2);
     battery_voltage2[5] =0;
     lcd_out(1,15, battery_voltage2);
     Lcd_Chr_Cp('V');
                    }

void main() {
 ADCON1 = 0x00; // All channels are config as analog I/p.
 TRISA=0b00001111;
 TRISD.F0 = 1;       //Configure 1st bit of PORTD as input for power on
 TRISB = 0;          //Configure PORTB as output
 PORTB = 0;
 PORTD.F0 = 1;       //Switch off

adc_init();        // Initialize ADC module with default settings
Lcd_Init();                        // Initialize LCD
Lcd_Cmd(_LCD_CURSOR_OFF);          // LCD Cursor Off
Lcd_Cmd(_LCD_CLEAR);               // Clear display
lcd_out(1,1,"TEMP=");
lcd_out(1,11,"Bat=");

do {
   //output_voltage = ADC_read(3);
   //output_current = ADC_read(4);

   temp_read();
   battery_read();
   
    if ((temp > 56)&&(battery_voltage < 676)) {
       if (PORTD.F0 == 1)             PORTB = 0b00000011;   // cooling fan on and battery LED on
       else PORTB = 0b00000011;
    }else if ((temp < 56)&&(battery_voltage < 676)) {
       if (PORTD.F0 == 1)             PORTB = 0b00000001;   // cooling fan off and battery LED on
       else PORTB = 0b00000001;
    }else if ((temp < 56)&&(battery_voltage > 676)) {
       if (PORTD.F0 == 1)             PORTB = 0b00000000;   // cooling fan off and battery LED off
       else PORTB = 0b00000100;
    }else if ((temp > 56)&&(battery_voltage > 676)) {
       if (PORTD.F0 == 1)             PORTB = 0b00000010;   // cooling fan on and battery LED on
       else PORTB = 0b00000110;
    }

    } while(1);
}
 

Configure ADCON0 properly.

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// LCD module connections
sbit LCD_RS at RC4_bit;
sbit LCD_EN at RC5_bit;
sbit LCD_D4 at RD1_bit;
sbit LCD_D5 at RD2_bit;
sbit LCD_D6 at RD3_bit;
sbit LCD_D7 at RD4_bit;
 
sbit LCD_RS_Direction at TRISC4_bit;
sbit LCD_EN_Direction at TRISC5_bit;
sbit LCD_D4_Direction at TRISD1_bit;
sbit LCD_D5_Direction at TRISD2_bit;
sbit LCD_D6_Direction at TRISD3_bit;
sbit LCD_D7_Direction at TRISD4_bit;
// End LCD module connections
 
unsigned int battery_voltage;
unsigned int output_voltage;
unsigned int output_current;
unsigned int temp;
float temp1;
float battery_voltage1;
char temper[23];
char battery_voltage2[23];
float x = 15.15;
 
void temp_read(void) {
 
     temp = ADC_read(0);            // Get 10-bit results of AD conversion
     temp1 = (temp * 500 / 1023);
     if(temp > 56) PORTB.F1 = 1;   // cooling fan on
     else PORTB.F1 = 0;             // cooling fan off
 
     FloatToStr(temp1,temper);
     LCD_Out(1,6,Ltrim(temper));
     Lcd_Chr_Cp(0xdf);
     Lcd_Chr_Cp('C');
     Lcd_Chr_Cp(' ');
}
 
void battery_read() {
 
     battery_voltage = ADC_read(1);                       // Get 10-bit results of AD conversion
     battery_voltage1 = (battery_voltage * 15.15 / 1023.0);
     if(battery_voltage < 676) PORTB.F0 = 1;             // battery LED off
     else PORTB.F0 = 0;
                                 // battery too low LED on
     FloatToStr(battery_voltage1,battery_voltage2);
     LCD_Out(2,6,Ltrim(battery_voltage2));
     Lcd_Chr_Cp('V');
     Lcd_Chr_Cp(' ');
                    }
 
void main() {
 
 CM1CON0 = 0x00;
 CM2CON0 = 0x00;
 ANSEL = 0x0F;
 ANSELH = 0x00;
 ADCON1 = 0x80;
 
 TRISA = 0x0F;
 TRISB = 0x00;
 TRISC = 0x00;
 TRISD = 0x01;
 
 PORTD.F0 = 1;       //Switch off
 
LCD_Init();                        // Initialize LCD
LCD_Cmd(_LCD_CURSOR_OFF);          // LCD Cursor Off
LCD_Cmd(_LCD_CLEAR);               // Clear display
LCD_out(1,1,"TEMP=");
LCD_out(1,11,"Bat=");
 
do {
 
   temp_read();
   battery_read();
 
   if ((PORTD.F0 == 0) && (battery_voltage > 676)) {  //If the switch is pressed
       Delay_ms(100);    //Switch Debounce
       while((PORTD.F0 == 0) && (battery_voltage > 676));        //while the switch is pressed wait here
          {
           PORTB.F2 = 1; //PWM LED ON           
          }
    }
    else {
           PORTB.F2 = 0;    //PWM LED Off
    }
 
    } while(1);
}
 
Last edited:
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