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DHT22 code desired (RH and Temp sensor)
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Ttelmah



Joined: 11 Mar 2010
Posts: 13036

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PostPosted: Tue Nov 08, 2016 4:36 am     Reply with quote

Fair enough. I suspect he didn't bother, since there was a working driver. Smile
wided



Joined: 22 Jun 2017
Posts: 1

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two dht22
PostPosted: Tue Jul 18, 2017 4:53 pm     Reply with quote

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: 6064
Location: Greensville,Ontario

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PostPosted: Tue Jul 18, 2017 5:01 pm     Reply with quote

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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