how to code ADC voltage to LCD display?

[caramelz]

hi i'm using mcc18 compiler. I need to display the voltage on my lcd (tc1602A) using microcontroller (PIC18f4520). I'm stuck after while(ADCON0bits.DONE), and i dunno how to display the value on LCD.
Please help!

#include <p18f4520.h>
#include <delays.h>
#include <stdlib.h> 

	ADCON0=0b00000001;
	ADCON1=0b00000111;
	ADCON2=0b10000010;

Delay10TCYx(5);
ADCON0bits.GO = 1;		// Start ADC 
while(ADCON0bits.DONE);	// ADC completed?

 

[jayanth.devarayanadurga]

Where is LCD Code? You have to get the values in ADRESH and ADRESL into a float or int variable and convert that float ot int value to string and display the sting on LCD.

Post full code in syntax tags.

 

[caramelz]

I need a range from 0 to 5V in 2decimals place on the LCD
I dont get

#include <p18f4520.h>
#include <delays.h>
#include <stdlib.h> 

void Init_LCD(void);   
void W_ctr_8bit(char);  
void W_data_8bit(char);

#define LCD_DATA PORTD
#define LCD_RS PORTBbits.RB1
#define LCD_E PORTBbits.RB2
void main()
{       int result;
        char MESS[i]="Voltage:"
	ADCON0=0b00000001;
	ADCON1=0b00000111;
	ADCON2=0b10000110;

Delay10TCYx(5);
ADCON0bits.GO = 1;		// Start ADC 
while(ADCON0bits.DONE);	// ADC completed?		
result = ADRESH;;
result>>=4;
PORTB=result;
for(i=0;i<8;i++)
W_data_8bit(Mess[i]);  // is to print text to LCD
}

 

[jayanth.devarayanadurga]

Check this link. I have written a code there. My previous account was internetuser2k11 and 12.

https://www.edaboard.com/threads/254723/



https://www.edaboard.com/threads/253183/

Use that code. There is a small mistake in floattosting() function. I have fixed it here.

---

Code C - [expand]
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//Function Prototypes
void floattostring(double FP_NUM);
 
//Sub Function
void floattostring(double FP_NUM) {
        double fpnumber;
        long int befdec, aftdec;
 
        fpnumber = FP_NUM;
 
        befdec = fpnumber;                      // Fractional part is truncated
                                                // 12.163456 becomes 12
        aftdec = fpnumber * 100;            // 12.163456 becomes 1216
        aftdec = aftdec - (befdec * 100);   // 1216 - 1200 = 16
 
 
        if (fpnumber < 1) {
                string[0] = '0';
                string[1] = '.';
                string[2] = (aftdec/10) + 48;
                string[3] = (aftdec/1)%10 + 48;
                string[4] = '\0';
                
 
        }
 
        else if ((fpnumber >= 1) && (fpnumber < 10)) {
                string[0] = (befdec/1)%10 + 48;
                string[1] = '.';
                string[2] = (aftdec/10) + 48;
                string[3] = (aftdec/1)%10 + 48;
                string[4] = '\0';
                
 
        }
 
        else if ((fpnumber >= 10) && (fpnumber < 100)) {
                string[0] = (befdec/10) + 48;
                string[1] = (befdec/1)%10 + 48;
                string[2] = '.';
                string[3] = (aftdec/10) + 48;
                string[4] = (aftdec/1)%10 + 48;
                string[5] = '\0';
                
 
        }
 
        else if ((fpnumber >= 100) && (fpnumber < 1000)) {
                string[0] = (befdec/100) + 48;
                string[1] = (befdec/10)%10 + 48;
                string[2] = (befdec/1)%10 + 48;
                string[3] = '.';
                string[4] = (aftdec/10) + 48;
                string[5] = '\0';
                
 
        }
        
        else if ((fpnumber >= 1000) && (fpnumber < 10000)) {
                string[0] = (befdec/1000) + 48;
                string[1] = (befdec/100)%10 + 48;
                string[2] = (befdec/10)%10 + 48;
                string[3] = (befdec/1)%10 + 48;
                string[4] = '.';
                string[5] = (aftdec/10) + 48;
                string[6] = '\0';
                
 
        }
 
        else if ((fpnumber >= 10000) && (fpnumber < 100000)) {
                string[0] = (befdec/10000) + 48;
                string[1] = (befdec/1000)%10 + 48;
                string[2] = (befdec/100)%10 + 48;
                string[3] = (befdec/10)%10 + 48;
                string[4] = (befdec/1)%10 + 48;
                string[5] = '.';
                string[6] = (aftdec/10) + 48;
                string[7] = '\0';
 
        }
        
 
}

---

 

[caramelz]

Check this link. I have written a code there. My previous account was internetuser2k11 and 12.

https://www.edaboard.com/threads/254723/



https://www.edaboard.com/threads/253183/

Use that code. There is a small mistake in floattosting() function. I have fixed it here.

---

Code C - [expand]
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//Function Prototypes
void floattostring(double FP_NUM);
 
//Sub Function
void floattostring(double FP_NUM) {
        double fpnumber;
        long int befdec, aftdec;
 
        fpnumber = FP_NUM;
 
        befdec = fpnumber;                      // Fractional part is truncated
                                                // 12.163456 becomes 12
        aftdec = fpnumber * 100;            // 12.163456 becomes 1216
        aftdec = aftdec - (befdec * 100);   // 1216 - 1200 = 16
 
 
        if (fpnumber < 1) {
                string[0] = '0';
                string[1] = '.';
                string[2] = (aftdec/10) + 48;
                string[3] = (aftdec/1)%10 + 48;
                string[4] = '\0';
                
 
        }
 
        else if ((fpnumber >= 1) && (fpnumber < 10)) {
                string[0] = (befdec/1)%10 + 48;
                string[1] = '.';
                string[2] = (aftdec/10) + 48;
                string[3] = (aftdec/1)%10 + 48;
                string[4] = '\0';
                
 
        }
 
        else if ((fpnumber >= 10) && (fpnumber < 100)) {
                string[0] = (befdec/10) + 48;
                string[1] = (befdec/1)%10 + 48;
                string[2] = '.';
                string[3] = (aftdec/10) + 48;
                string[4] = (aftdec/1)%10 + 48;
                string[5] = '\0';
                
 
        }
 
        else if ((fpnumber >= 100) && (fpnumber < 1000)) {
                string[0] = (befdec/100) + 48;
                string[1] = (befdec/10)%10 + 48;
                string[2] = (befdec/1)%10 + 48;
                string[3] = '.';
                string[4] = (aftdec/10) + 48;
                string[5] = '\0';
                
 
        }
        
        else if ((fpnumber >= 1000) && (fpnumber < 10000)) {
                string[0] = (befdec/1000) + 48;
                string[1] = (befdec/100)%10 + 48;
                string[2] = (befdec/10)%10 + 48;
                string[3] = (befdec/1)%10 + 48;
                string[4] = '.';
                string[5] = (aftdec/10) + 48;
                string[6] = '\0';
                
 
        }
 
        else if ((fpnumber >= 10000) && (fpnumber < 100000)) {
                string[0] = (befdec/10000) + 48;
                string[1] = (befdec/1000)%10 + 48;
                string[2] = (befdec/100)%10 + 48;
                string[3] = (befdec/10)%10 + 48;
                string[4] = (befdec/1)%10 + 48;
                string[5] = '.';
                string[6] = (aftdec/10) + 48;
                string[7] = '\0';
 
        }
        
 
}

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Thanks i will try it asap. but how do i display in the LCD? or string is the one that display?

 

[jayanth.devarayanadurga]

Use LCD Code that I have written here. https://www.edaboard.com/threads/287832/