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
76
77
78
79
80
81
82
83
| //Interface of DHT11 with PIC16F84A MikroC code
//Please read the datasheet of DHT11 sensor to understand the code
//Written by: BENCHEROUDA Okba
//electronnote@gmail.com
//Use at your own risk
// LCD module connections
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;
// End LCD module connections
unsigned char *text,mytext[4];
unsigned short a, b, i, t, rh;
void StartSignal(){
TRISB.F6 = 0; //Configure RB6 as output
PORTB.F6 = 0; //RB6 sends 0 to the sensor
delay_ms(18);
PORTB.F6 = 1; //RB6 sends 1 to the sensor
delay_us(30);
TRISB.F6 = 1; //Configure RB6 as input
}
void CheckResponse(){
a = 0;
delay_us(40);
if (PORTB.F6 == 0){
delay_us(80);
if (PORTB.F6 == 1) a = 1; delay_us(40);}
}
void ReadData(){
for(b=0; b<8; b++){
while(!PORTB.F6); //Wait until PORTB.F6 goes HIGH
delay_us(30);
if(PORTB.F6 == 0) i&=~(1<<(7-b)); //Clear bit (7-b)
else{i|= (1 <<( 7 - b)); //Set bit (7-b)
while(PORTB.F6);} //Wait until PORTB.F6 goes LOW
}
}
void error(){
text="ERROR";
Lcd_Out(1,6,text);
}
void main() {
TRISB = 0; //Configure PORTB as output
PORTB = 0; //Initial value of PORTB
Lcd_Init();
while(1){
Lcd_Cmd(_LCD_CURSOR_OFF); // cursor off
Lcd_Cmd(_LCD_CLEAR); // clear LCD
StartSignal();
CheckResponse();
if(a == 1){
ReadData();
rh = i;
ReadData();
ReadData();
t = i;
ReadData();
ReadData();
if(i = rh + t){
text = "Temp: .0C";
Lcd_Out(1, 4, text);
text = "Humi: .0%";
Lcd_Out(2, 4, text);
ByteToStr(t,mytext);
Lcd_Out(1, 9, Ltrim(mytext));
ByteToStr(rh,mytext);
Lcd_Out(2, 9, Ltrim(mytext));}
else error();
}
else error();
delay_ms(2000);
}
} |