Display temperature on LCD 16x2 display using LM35 and Pic16F876A

Code C - [expand]
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
sbit LCD_RS at RC2_bit;
sbit LCD_EN at RC3_bit;
sbit LCD_D4 at RC7_bit;
sbit LCD_D5 at RC6_bit;
sbit LCD_D6 at RC5_bit;
sbit LCD_D7 at RC4_bit;
 
sbit LCD_RS_Direction at TRISC2_bit;
sbit LCD_EN_Direction at TRISC3_bit;
sbit LCD_D4_Direction at TRISC7_bit;
sbit LCD_D5_Direction at TRISC6_bit;
sbit LCD_D6_Direction at TRISC5_bit;
sbit LCD_D7_Direction at TRISC4_bit;
// End LCD module connections
void read_adc(void);
void custchar(char x, char y);
unsigned int result;
float n;
int temp,rs;
char txt[7];
const char character[]={4,10,4,0,0,0,0,0}; //degree symbol
void main(void)
{
CMCON=7; //Comparator off
TRISA.RA0=1;
ADCON0=0b10000000;       
ADCON1=0b11000000;       
ADCON0.ADON=1;                // turn on the A2D conversion module
Delay_ms(300);
LCD_init();
Lcd_Cmd(_LCD_CLEAR);       // Clear LCD display
Lcd_Cmd(_LCD_CURSOR_OFF);  // Turn cursor off
        while(1){
          Delay_ms(30);
          read_adc();
          n=result*0.48876;
          n+=0.05;
          temp=n;
          n=(n-temp)*10;
          rs=n;
          InttoStr(temp,txt);
          Lcd_Out(2,3,txt);
          Lcd_chr(2,10,'.');
          Lcd_chr(2,11,rs+48);
          custchar(2,12);
          Lcd_chr(2,13,'C');
          Delay_ms(30);
         }
 
}
 
 
void read_adc(void)
{
unsigned short i;
unsigned long result_temp=0;
      for(i=2000;i>0;i-=1) //looping 2000 times for getting average value
      {
        ADCON0.GO = 1; //ADGO is the bit 2 of the ADCON0 register
        while(ADCON0.GO==1); //ADC start, ADGO=0 after finish ADC progress
        result=ADRESH;
        result=result<<8; //shift to left for 8 bit
        result=result|ADRESL; //10 bit result from ADC
        result_temp+=result;
      }
result = result_temp/2000; //getting average value
}
 
void custchar(char x, char y){
char i;
Lcd_Cmd(64);
for(i=0;i<=7;i++) Lcd_Chr_CP(character[i]);
Lcd_Cmd(_LCD_RETURN_HOME);
LCD_chr(x,y,0);
}