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Ttelmah
Joined: 11 Mar 2010
Posts: 19792
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 Posted: Tue Nov 08, 2016 4:36 am |
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Fair enough. I suspect he didn't bother, since there was a working driver.  |
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wided
Joined: 22 Jun 2017
Posts: 1
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| two dht22 |
| Posted: Tue Jul 18, 2017 4:53 pm |
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HELLO. I need your help with two DHT22 sensor and PIC18f4550.
when i use one dht22 it works but when i use two dht22 it doesn't. Can anyone help me??? Thanks anyway!!!
This is the code:
| Code: |
#include <18f4550.h>
#define LCD_ENABLE_PIN PIN_D0
#define LCD_RS_PIN PIN_D1
#define LCD_RW_PIN PIN_D2
#define LCD_DATA4 PIN_D3
#define LCD_DATA5 PIN_D4
#define LCD_DATA6 PIN_D5
#define LCD_DATA7 PIN_D6
#fuses HS,NOWDT,NOLVP
#use delay(clock = 20000000)
#include <lcd.c>
#use fast_io(B)
#use fast_io(D)
#BIT Data_Pin = 0xF81.0 // Pin mapped to PORTB.0
#BIT Data_Pin_Direction = 0xF93.0 // Pin direction mapped to TRISB.0
#BIT Data_Pin1 = 0xF83.0 // Pin mapped to PORTB.0
#BIT Data_Pin_Direction1 = 0xF95.0 // Pin direction mapped to TRISB.0
char message1[] = "Temp = 00.0 C";
char message2[] = "RH = 00.0 %";
short Time_out ;
unsigned int8 T_byte1, T_byte2, RH_byte1, RH_byte2, CheckSum ;
unsigned int16 Temp, RH;
char message11[] = "Text = 00.0 C";
char message22[] = "R1 = 00.0 %";
short Time_out1 ;
unsigned int8 T_byte11, T_byte22, RH_byte11, RH_byte22, CheckSum1 ;
unsigned int16 Text, R1;
void start_signal(){
Data_Pin_Direction = 0; // Configure connection pin as output
Data_Pin = 0; // Connection pin output low
delay_ms(25);
Data_Pin = 1; // Connection pin output high
delay_us(30);
Data_Pin_Direction = 1; // Configure connection pin as input
}
short check_response(){
delay_us(40);
if(!Data_Pin){ // Read and test if connection pin is low
delay_us(80);
if(Data_Pin){ // Read and test if connection pin is high
delay_us(50);
return 1;}
}
}
unsigned int8 Read_Data(){
unsigned int8 i, k, _data = 0; // k is used to count 1 bit reading duration
if(Time_out)
break;
for(i = 0; i < 8; i++){
k = 0;
while(!Data_Pin){ // Wait until pin goes high
k++;
if (k > 100) {Time_out = 1; break;}
delay_us(1);}
delay_us(30);
if(!Data_Pin)
bit_clear(_data, (7 - i)); // Clear bit (7 - i)
else{
bit_set(_data, (7 - i)); // Set bit (7 - i)
while(Data_Pin){ // Wait until pin goes low
k++;
if (k > 100) {Time_out = 1; break;}
delay_us(1);}
}
}
return _data;
}
void start_signal1(){
Data_Pin_Direction1 = 0; // Configure connection pin as output
Data_Pin1 = 0; // Connection pin output low
delay_ms(25);
Data_Pin1 = 1; // Connection pin output high
delay_us(30);
Data_Pin_Direction1 = 1; // Configure connection pin as input
}
short check_response1(){
delay_us(40);
if(!Data_Pin1){ // Read and test if connection pin is low
delay_us(80);
if(Data_Pin1){ // Read and test if connection pin is high
delay_us(50);
return 1;}
}
}
unsigned int8 Read_Data1(){
unsigned int8 i, k, _data1 = 0; // k is used to count 1 bit reading duration
if(Time_out1)
break;
for(i = 0; i < 8; i++){
k = 0;
while(!Data_Pin1){ // Wait until pin goes high
k++;
if (k > 100) {Time_out1 = 1; break;}
delay_us(1);}
delay_us(30);
if(!Data_Pin1)
bit_clear(_data1, (7 - i)); // Clear bit (7 - i)
else{
bit_set(_data1, (7 - i)); // Set bit (7 - i)
while(Data_Pin1){ // Wait until pin goes low
k++;
if (k > 100) {Time_out1 = 1; break;}
delay_us(1);}
}
}
return _data1;
}
void main(){
//setup_oscillator(OSC_8MHZ); // Set internal oscillator to 8MHz
//setup_adc_ports(NO_ANALOGS); // Configure AN pins as digital
lcd_init(); // Initialize LCD module
lcd_putc('\f'); // LCD clear
while(TRUE){
delay_ms(1000);
Time_out = 0;
Start_signal();
if(check_response()){ // If there is response from sensor
RH_byte1 = Read_Data(); // read RH byte1
RH_byte2 = Read_Data(); // read RH byte2
T_byte1 = Read_Data(); // read T byte1
T_byte2 = Read_Data(); // read T byte2
Checksum = Read_Data(); // read checksum
if(Time_out){ // If reading takes long time
lcd_putc('\f'); // LCD clear
lcd_gotoxy(5, 1); // Go to column 5 row 1
lcd_putc("Time out!");
}
else{
if(CheckSum == ((RH_Byte1 + RH_Byte2 + T_Byte1 + T_Byte2) & 0xFF)){
RH = RH_byte1;
RH = (RH << 8) | RH_byte2;
Temp = T_byte1;
Temp = (Temp << 8) | T_byte2;
if (Temp > 0X8000){
message1[6] = '-';
Temp = Temp & 0X7FFF; }
else
message1[6] = ' ';
message1[7] = (Temp / 100) % 10 + 48;
message1[8] = (Temp / 10) % 10 + 48;
message1[10] = Temp % 10 + 48;
message2[7] = (RH / 100) % 10 + 48;
message2[8] = (RH / 10) % 10 + 48;
message2[10] = RH % 10 + 48;
message1[11] = 223; // Degree symbol
lcd_putc('\f'); // LCD clear
lcd_gotoxy(1, 1); // Go to column 1 row 1
printf(lcd_putc, message1); // Display message1
lcd_gotoxy(1, 2); // Go to column 1 row 2
printf(lcd_putc, message2); // Display message2
}
else {
lcd_putc('\f'); // LCD clear
lcd_gotoxy(1, 1); // Go to column 1 row 1
lcd_putc("Checksum Error!");
}
}
}
else {
lcd_putc('\f'); // LCD clear
lcd_gotoxy(3, 1); // Go to column 3 row 1
lcd_putc("No response");
lcd_gotoxy(1, 2); // Go to column 1 row 2
lcd_putc("from the sensor");
}
delay_ms(2000);
Time_out1 = 0;
Start_signal1();
if(check_response1()){ // If there is response from sensor
RH_byte11 = Read_Data1(); // read RH byte1
RH_byte22 = Read_Data1(); // read RH byte2
T_byte11 = Read_Data1(); // read T byte1
T_byte22 = Read_Data1(); // read T byte2
Checksum1 = Read_Data1(); // read checksum
if(Time_out1){ // If reading takes long time
lcd_putc('\f'); // LCD clear
lcd_gotoxy(5, 1); // Go to column 5 row 1
lcd_putc("Time out!");
}
else{
if(CheckSum1 == ((RH_Byte11 + RH_Byte22 + T_Byte11 + T_Byte22) & 0xFF)){
R1 = RH_byte11;
R1 = (R1 << 8) | RH_byte22;
Text = T_byte11;
Text = (Text << 8) | T_byte22;
if (Text > 0X8000){
message11[6] = '-';
Text = Text & 0X7FFF; }
else
message11[6] = ' ';
message11[7] = (Text / 100) % 10 + 48;
message11[8] = (Text / 10) % 10 + 48;
message11[10] = Text % 10 + 48;
message22[7] = (R1 / 100) % 10 + 48;
message22[8] = (R1 / 10) % 10 + 48;
message22[10] = R1 % 10 + 48;
message11[11] = 223; // Degree symbol
lcd_putc('\f'); // LCD clear
lcd_gotoxy(1, 1); // Go to column 1 row 1
printf(lcd_putc, message1); // Display message1
lcd_gotoxy(1, 2); // Go to column 1 row 2
printf(lcd_putc, message2); // Display message2
}
else {
lcd_putc('\f'); // LCD clear
lcd_gotoxy(1, 1); // Go to column 1 row 1
lcd_putc("Checksum Error!");
}
}
}
else {
lcd_putc('\f'); // LCD clear
lcd_gotoxy(3, 1); // Go to column 3 row 1
lcd_putc("No response");
lcd_gotoxy(1, 2); // Go to column 1 row 2
lcd_putc("from the sensor");
}
}
}
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temtronic
Joined: 01 Jul 2010
Posts: 9459
Location: Greensville,Ontario
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| Posted: Tue Jul 18, 2017 5:01 pm |
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Simple to debug...
Using the single sensor program, confirm both DHT22 sensors work.
Copy the single sensor program, call it version2, and confirm both sensors work (obviously 1 at a time), using the 2nd I/O pin.
Now 'merge' both programs into one.. it should work fine. |
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