 |
 |
| View previous topic :: View next topic |
| Author |
Message |
Ttelmah
Joined: 11 Mar 2010
Posts: 19215
|
|
 Posted: Tue Nov 08, 2016 4:36 am |
 |
|
Fair enough. I suspect he didn't bother, since there was a working driver.  |
|
 |
wided
Joined: 22 Jun 2017
Posts: 1
|
| two dht22 |
| Posted: Tue Jul 18, 2017 4:53 pm |
|
|
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");
}
}
}
|
|
|
|
temtronic
Joined: 01 Jul 2010
Posts: 9093
Location: Greensville,Ontario
|
|
| Posted: Tue Jul 18, 2017 5:01 pm |
|
|
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. |
|
|
|
|
You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
|
Powered by phpBB © 2001, 2005 phpBB Group
|
FAQ 
Search
Register
Profile 
Log in to check your private messages 
Log in
