Tengo una pregunta se que talvez esta fuera del tema pero necesito ayuda.
Como puedo guardar el valor de temperatura y humedad en una variable para despues utilizar estas variables.
El programa se los muestro a continuación.
/* Interfacing PIC16F887 with DHT22 (AM2302) sensor CCS C code
Read DHT22 datasheet to understand the code!
Internal oscillator used @ 8MHz
Timer1 is configured so that it increments every 1µs
http://ccspicc.blogspot.com/ electronnote@gmail.com
*/
//LCD module connections
#define LCD_RS_PIN PIN_D0
#define LCD_RW_PIN PIN_D1
#define LCD_ENABLE_PIN PIN_D2
#define LCD_DATA4 PIN_D3
#define LCD_DATA5 PIN_D4
#define LCD_DATA6 PIN_D5
#define LCD_DATA7 PIN_D6
//End LCD module connections
#include <16F887.h>
#fuses NOMCLR NOBROWNOUT NOLVP INTRC_IO
#use delay(clock = 8MHz)
#include <lcd.c>
#use fast_io(B)
#use fast_io(D)
#define DHT22_PIN PIN_B0 // DHT22 Data pin is connected to RB0
char message1[] = "Temp = 00.0 C ";
char message2[] = "RH = 00.0 % ";
short Time_out = 0;
unsigned int8 T_byte1, T_byte2, RH_byte1, RH_byte2, CheckSum ;
unsigned int16 Temp, RH;
void start_signal(){
output_drive(DHT22_PIN); // Configure connection pin as output
output_low(DHT22_PIN); // Connection pin output low
delay_ms(25);
output_high(DHT22_PIN); // Connection pin output high
delay_us(25);
output_float(DHT22_PIN); // Configure connection pin as input
}
short check_response(){
set_timer1(0); // Set Timer1 value to 0
setup_timer_1(T1_INTERNAL | T1_DIV_BY_2); // Start Timer1 with internal clock source + 2 prescaler
while(!input(DHT22_PIN) && get_timer1() < 100); // Wait until DHT22_PIN becomes high (cheking of 80µs low time response)
if(get_timer1() > 99) // If response time > 99µS ==> Response error
return 0; // Return 0 (Device has a problem with response)
else{
set_timer1(0); // Set Timer1 value to 0
while(input(DHT22_PIN) && get_timer1() < 100); // Wait until DHT22_PIN becomes low (cheking of 80µs high time response)
if(get_timer1() > 99) // If response time > 99µS ==> Response error
return 0; // Return 0 (Device has a problem with response)
else
return 1; // Return 1 (response OK)
}
}
unsigned int8 Read_Data(){
unsigned int8 i, _data = 0;
if(Time_out)
break;
for(i = 0; i < 8; i++){
set_timer1(0); // Set Timer1 value to 0
while(!input(DHT22_PIN)) // Wait until DHT22_PIN becomes high
if(get_timer1() > 100){ // If low time > 100 ==> Time out error (Normally it takes 50µs)
Time_out = 1;
break;
}
set_timer1(0); // Set Timer1 value to 0
while(input(DHT22_PIN)) // Wait until DHT22_PIN becomes low
if(get_timer1() > 100){ // If high time > 100 ==> Time out error (Normally it takes 26-28µs for 0 and 70µs for 1)
Time_out = 1;
break;
}
if(get_timer1() > 50) // If high time > 50 ==> Sensor sent 1
bit_set(_data, (7 - i)); // Set bit (7 - i)
}
return _data;
}
void main(){
setup_oscillator(OSC_8MHZ); // Set the internal oscillator to 8MHz
setup_timer_1(T1_DISABLED); // Disable Timer1
lcd_init(); // Initialize LCD module
lcd_putc('\f'); // Clear LCD
while(TRUE){
delay_ms(1000); // Wait 1s
Time_out = 0;
Start_signal(); // Send start signal to the sensor
if(check_response()){ // Check if there is a response from sensor (If OK start reading humidity and temperature data)
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
setup_timer_1(T1_DISABLED); // Disable Timer1
if(Time_out) { // If there is a time out in reading
lcd_putc('\f'); // LCD clear
lcd_gotoxy(5, 1); // Go to column 5 row 1
lcd_putc("Time out!"); // Display "Time out!"
}
else { // If there is no time out
if(CheckSum == ((RH_Byte1 + RH_Byte2 + T_Byte1 + T_Byte2) & 0xFF)){
RH = RH_byte1;
RH = (RH <<
| RH_byte2;
Temp = T_byte1;
Temp = (Temp <<
| 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;
if(RH == 1000) // If the relative humidity = 100.0 %
message2[6] = 1 + 48;
else
message2[6] = ' ';
message2[7] = (RH / 100) % 10 + 48;
message2[8] = (RH / 10) % 10 + 48;
message2[10] = RH % 10 + 48;
message1[11] = 223; // Degree symbol
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 { // If there is no response from DHT22 sensor
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");
}
}
}
Saludos.
