ลองทำตาม Datasheet ของ DHT11 แล้วยังไม่ออก ผมเคยลองนำโค๊ดของพี่ท่านหนึ่ง ไม่แน่ใจว่าพี่ Ozuke หรือของพี่ jeng พอดีว่า HDD ของผมเสีย โค๊ดที่เป็นต้นฉบับและที่เอามาดัดแปลงเพิ่มเติมเลยหายหมด
***มาแจ้งอัพเดท ตอนนี้ผมกู้ข้อมุลเก่ากลับมาได้หมดแล้ว ขอบคุณทุกๆท่านครับ
ผมใช้ตัวนี้อยู่
http://www.es.co.th/detail.asp?Prod=39100019
และใช้งาน Codevision AVR ลองดูไหมครับ
Code
//********************************************************
/*****************************************************
This program was produced by the
CodeWizardAVR V2.05.3 Standard
Automatic Program Generator
ฉ Copyright 1998-2011 Pavel Haiduc, HP InfoTech s.r.l.
http://www.hpinfotech.com
Project :
Version :
Date : 25/10/2012
Author : PerTic@n
Company : If You Like This Software,Buy It
Comments:
Chip type : ATmega8
Program type : Application
AVR Core Clock frequency: 8.000000 MHz
Memory model : Small
External RAM size : 0
Data Stack size : 256
*****************************************************/
#include <mega8.h>
#include <stdio.h>
#include <math.h>
#include <stdlib.h>// External Interrupt 0 service routine
#include <delay.h>
#include <string.h>// Declare your global variables here
#define DATA PINB.0
#define DATAHI() DDRB.0 = 0
#define DATALO() DDRB.0 = 1
#define DATA_in PINB.0
#define DATA_out_HI() {DDRB.0 = 1; PORTB.0 = 1;}
#define DATA_out_LO() {DDRB.0 = 1; PORTB.0 = 0;}
#define DATA_in_HI() {DDRB.0 = 0; PORTB.0 = 1;}
#define DATA_in_LO() {DDRB.0 = 0; PORTB.0 = 0;}
// #define SCKHI() DDRB.1 = 0
// #define SCKLO() DDRB.1 = 1
#define SCKHI() PORTB.1 = 1
#define SCKLO() {DDRB.1 = 1; PORTB.1 = 0;}
/*
#define DATA PINC.2
#define DATAHI() DDRC.2 = 0
#define DATALO() DDRC.2 = 1
#define DATA_in PINC.2
#define DATA_out_HI() {DDRC.2 = 1; PORTC.2 = 1;}
#define DATA_out_LO() {DDRC.2 = 1; PORTC.2 = 0;}
#define DATA_in_HI() {DDRC.2 = 0; PORTC.2 = 1;}
#define DATA_in_LO() {DDRC.2 = 0; PORTC.2 = 0;}
// #define SCKHI() DDRB.1 = 0
// #define SCKLO() DDRB.1 = 1
#define SCKHI() PORTC.3 = 1
#define SCKLO() {DDRC.3 = 1; PORTC.3 = 0;}
*/
////////////////////////////////////////////////////
// Declare your global variables here
typedef union {
unsigned int i;
float f;
} value;
unsigned int bit_data;
unsigned int data_bit[17];
float humidity_show1,temperature_show1,True_humidity_show1;
#define _nop_() delay_us(100) //delay_us(2)
//adr command r/w
#define STATUS_REG_W 0x06 //000 0011 0
#define STATUS_REG_R 0x07 //000 0011 1
#define MEASURE_TEMP 0x03 //000 0001 1
#define MEASURE_HUMI 0x05 //000 0010 1
#define RESET 0x1e //000 1111 0
//----------------------------------------------------------------------------------
void s_transstart(void)
//----------------------------------------------------------------------------------
// generates a transmission start
// _____ __
// DATA: |_______| |__
// ___ ___
// SCK : ___| |___| |______
{
DATA_out_HI();
SCKLO(); //Initial state
_nop_();
SCKHI();
_nop_();
DATA_out_LO();
_nop_();
SCKLO();
_nop_();
SCKHI();
_nop_();
DATA_out_HI();
_nop_();
SCKLO();
_nop_();
DATA_out_LO();
}
//----------------------------------------------------------------------------------
void s_clk(void)
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// SCK : __| |__
{
_nop_();
SCKLO();
_nop_();
SCKHI();
_nop_();
SCKLO();
_nop_();
}
//----------------------------------------------------------------------------------
void s_connectionreset(void)
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// _____________________________________________________
// DATA:
// _ _ _ _ _ _ _ _ _
// SCK : __| |__| |__| |__| |__| |__| |__| |__| |__| |_____
{
unsigned char i;
_nop_();
DATA_out_HI();
_nop_();
SCKLO();
_nop_(); //Initial state
for (i = 0; i < 9; i++) //9 SCK cycles
{
s_clk();
}
}
//----------------------------------------------------------------------------------
void print_serail_data_timing(void)
//----------------------------------------------------------------------------------
{
printf("**********Humidity***************");
printf("\r\n");
printf("%d",data_bit[0] );
printf(",");
printf("%d",data_bit[1]);
printf(",");
printf("%d",data_bit[2] );
printf(",");
printf("%d",data_bit[3] );
printf(",");
printf("%d",data_bit[4] );
printf(",");
printf("%d",data_bit[5] );
printf(",");
printf("%d",data_bit[6] );
printf(",");
printf("%d",data_bit[7] );
printf(", ");
printf("%d",data_bit[8] );
printf(",");
printf("%d",data_bit[9] );
printf(",");
printf("%d",data_bit[10] );
printf(",");
printf("%d",data_bit[11] );
printf(",");
printf("%d",data_bit[12] );
printf(",");
printf("%d",data_bit[13] );
printf(",");
printf("%d",data_bit[14] );
printf(",");
printf("%d",data_bit[15] );
printf(", Humidity Linear= ");
printf("%f", humidity_show1);
printf(" %");
printf("\r\n");
printf(" Humidity True= ");
printf("%f", True_humidity_show1); // For senser V4
printf("\r\n");
printf("**********Temp***************");
printf("\r\n");
printf("%d",data_bit[0] );
printf(",");
printf("%d",data_bit[1]);
printf(",");
printf("%d",data_bit[2] );
printf(",");
printf("%d",data_bit[3] );
printf(",");
printf("%d",data_bit[4] );
printf(",");
printf("%d",data_bit[5] );
printf(",");
printf("%d",data_bit[6] );
printf(",");
printf("%d",data_bit[7] );
printf(", ");
printf("%d",data_bit[8] );
printf(",");
printf("%d",data_bit[9] );
printf(",");
printf("%d",data_bit[10] );
printf(",");
printf("%d",data_bit[11] );
printf(",");
printf("%d",data_bit[12] );
printf(",");
printf("%d",data_bit[13] );
printf(",");
printf("%d",data_bit[14] );
printf(",");
printf("%d",data_bit[15] );
printf(", Actual= ");
//printf("%f",temperature_show2 );
printf("%d",data_bit[16] );
printf("'C");
printf("\r\n");
printf(", Temp 22= ");
printf("%f", temperature_show1);
printf("'C");
printf("\r\n");
}
//----------------------------------------------------------------------------------
void s_address(unsigned char val)
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// __ _____
// DATA: |_____________|
// _ _ _
// SCK : __| |__| |__| |__
{
_nop_();
DATA_out_LO();
_nop_();
s_clk(); //0
_nop_();
s_clk(); //0
_nop_();
s_clk(); //0
_nop_();
//----------------------------------------------------------------------------------
// communication reset: DATA-line=1 and at least 9 SCK cycles followed by transstart
// __ __ __
// DATA: |__________| |_____|
// _ _ _ _ _ _
// SCK : __| |__| |__| |__| |__| |__| |__
_nop_();
DATA_out_LO(); //0 0
s_clk();
s_clk();
if (val == 1)
{
DATA_out_HI(); //1 val ==1 for Humidity
}
else
{
DATA_out_LO(); //0 val ==0 for Temperature
}
s_clk();
if (val == 1)
{
DATA_out_LO(); //0 //0 val ==0 for Humidity
}
else
{
DATA_out_HI(); //0 val ==0 for Temperature
}
s_clk();
DATA_out_HI(); //1
s_clk();
DATA_in_HI(); //Pull for ACK
s_clk();
_nop_();
wait_ack:
if(DATA_in ==1)goto wait_ack; //Wait for ACK
/// read MSB byte
for (bit_data = 0; bit_data < 8; bit_data++)
{
_nop_();
data_bit[bit_data]=0;
if(DATA_in ==1 )data_bit[bit_data]=1;
s_clk();
}
DATA_out_LO(); //send ACK
_nop_();
_nop_();
s_clk();
DATA_in_HI();
/// read LSB byte
for (bit_data = 8; bit_data < 16; bit_data++)
{
_nop_();
data_bit[bit_data]=0;
if(DATA_in==1 )data_bit[bit_data]=1;
s_clk();
}
DATA_out_LO(); //send ACK
s_clk();
DATA_in_HI();
/////////////// conver BCD to decimal
data_bit[16]=0;
for (bit_data = 0; bit_data < 15; bit_data++)
{
if(data_bit[bit_data] == 1)
{
data_bit[16]=data_bit[16] + 1;
}
else
{
}
data_bit[16] <<= 1;//
}
if (val ==1)humidity_show1 = (-6.5468 +(0.0367*data_bit[16] )+ ((-1.5955E-6*data_bit[16])*(-1.5955E-6*data_bit[16])));
if (val ==0)temperature_show1= ( (0.01*data_bit[16] )-39.8);
True_humidity_show1= ((temperature_show1-25)*(0.01+(0.00008*humidity_show1))+humidity_show1);
// Whit off set //printf("%f", (-6.5468 +(0.0367*data_bit[16] )+ ((-1.5955E-6*data_bit[16])*(-1.5955E-6*data_bit[16])))); // For senser V4
//printf("%f", (-2.0468 +(0.0367*data_bit[16] )+ ((-1.5955E-6*data_bit[16])*(-1.5955E-6*data_bit[16])))); // For senser V4
// printf("%f", (-4.0000 +(0.0405*data_bit[16] )+ ((-2.8000E-6*data_bit[16])*(-2.8000E-6*data_bit[16])))); // For senser V3
}
//////////////////////////////////////////////////////////////////
#ifndef RXB8
#define RXB8 1
#endif
#ifndef TXB8
#define TXB8 0
#endif
#ifndef UPE
#define UPE 2
#endif
#ifndef DOR
#define DOR 3
#endif
#ifndef FE
#define FE 4
#endif
#ifndef UDRE
#define UDRE 5
#endif
#ifndef RXC
#define RXC 7
#endif
#define FRAMING_ERROR (1<<FE)
#define PARITY_ERROR (1<<UPE)
#define DATA_OVERRUN (1<<DOR)
#define DATA_REGISTER_EMPTY (1<<UDRE)
#define RX_COMPLETE (1<<RXC)
// USART Receiver buffer
#define RX_BUFFER_SIZE 8
char rx_buffer[RX_BUFFER_SIZE];
#if RX_BUFFER_SIZE <= 256
unsigned char rx_wr_index,rx_rd_index,rx_counter;
#else
unsigned int rx_wr_index,rx_rd_index,rx_counter;
#endif
// This flag is set on USART Receiver buffer overflow
bit rx_buffer_overflow;
// USART Receiver interrupt service routine
interrupt [USART_RXC] void usart_rx_isr(void)
{
char status,data;
status=UCSRA;
data=UDR;
if ((status & (FRAMING_ERROR | PARITY_ERROR | DATA_OVERRUN))==0)
{
rx_buffer[rx_wr_index++]=data;
#if RX_BUFFER_SIZE == 256
// special case for receiver buffer size=256
if (++rx_counter == 0) rx_buffer_overflow=1;
#else
if (rx_wr_index == RX_BUFFER_SIZE) rx_wr_index=0;
if (++rx_counter == RX_BUFFER_SIZE)
{
rx_counter=0;
rx_buffer_overflow=1;
}
#endif
}
}
#ifndef _DEBUG_TERMINAL_IO_
// Get a character from the USART Receiver buffer
#define _ALTERNATE_GETCHAR_
#pragma used+
char getchar(void)
{
char data;
while (rx_counter==0);
data=rx_buffer[rx_rd_index++];
#if RX_BUFFER_SIZE != 256
if (rx_rd_index == RX_BUFFER_SIZE) rx_rd_index=0;
#endif
#asm("cli")
--rx_counter;
#asm("sei")
return data;
}
#pragma used-
#endif
// Standard Input/Output functions
#include <stdio.h>
// TWI functions
#include <twi.h>
// Declare your global variables here
void main(void)
{
// Declare your local variables here
// Input/Output Ports initialization
// Port B initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=Out Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=0 State0=P
PORTB=0x01;
DDRB=0x02;
// Port C initialization
// Func6=In Func5=In Func4=In Func3=In Func2=In Func1=In Func0=In
// State6=T State5=T State4=T State3=T State2=T State1=T State0=T
PORTC=0x00;
DDRC=0x00;
// Port D initialization
// Func7=In Func6=In Func5=In Func4=In Func3=In Func2=In Func1=Out Func0=In
// State7=T State6=T State5=T State4=T State3=T State2=T State1=0 State0=P
PORTD=0x01;
DDRD=0x06;
// Timer/Counter 0 initialization
// Clock source: System Clock
// Clock value: Timer 0 Stopped
TCCR0=0x00;
TCNT0=0x00;
// Timer/Counter 1 initialization
// Clock source: System Clock
// Clock value: Timer1 Stopped
// Mode: Normal top=0xFFFF
// OC1A output: Discon.
// OC1B output: Discon.
// Noise Canceler: Off
// Input Capture on Falling Edge
// Timer1 Overflow Interrupt: Off
// Input Capture Interrupt: Off
// Compare A Match Interrupt: Off
// Compare B Match Interrupt: Off
TCCR1A=0x00;
TCCR1B=0x00;
TCNT1H=0x00;
TCNT1L=0x00;
ICR1H=0x00;
ICR1L=0x00;
OCR1AH=0x00;
OCR1AL=0x00;
OCR1BH=0x00;
OCR1BL=0x00;
// Timer/Counter 2 initialization
// Clock source: System Clock
// Clock value: Timer2 Stopped
// Mode: Normal top=0xFF
// OC2 output: Disconnected
ASSR=0x00;
TCCR2=0x00;
TCNT2=0x00;
OCR2=0x00;
// External Interrupt(s) initialization
// INT0: Off
// INT1: Off
MCUCR=0x00;
// Timer(s)/Counter(s) Interrupt(s) initialization
TIMSK=0x00;
// USART initialization
// Communication Parameters: 8 Data, 1 Stop, No Parity
// USART Receiver: On
// USART Transmitter: On
// USART Mode: Asynchronous
// USART Baud Rate: 9600
UCSRA=0x00;
UCSRB=0x98;
UCSRC=0x86;
UBRRH=0x00;
UBRRL=0x33;
// Analog Comparator initialization
// Analog Comparator: Off
// Analog Comparator Input Capture by Timer/Counter 1: Off
ACSR=0x80;
SFIOR=0x00;
// ADC initialization
// ADC disabled
ADCSRA=0x00;
// SPI initialization
// SPI disabled
SPCR=0x00;
// TWI initialization
// Mode: TWI Master
// Bit Rate: 100 kHz
twi_master_init(100);
// Global enable interrupts
#asm("sei")
s_connectionreset();
while (1)
{
s_connectionreset(); //reset sensor
s_transstart(); //transmission start
s_address(1); //read Humidity
delay_ms(800); //(be sure that the compiler doesn't eliminate this line!)
s_connectionreset(); //reset sensor
s_transstart(); //transmission start
s_address(0); //read Temp
print_serail_data_timing();
//----------wait approx. 0.8s to avoid heating up SHTxx------------------------------
delay_ms(800); //(be sure that the compiler doesn't eliminate this line!)
//---------------------------------------------------------------
}
}
โอ้ขอบคุณครับท่าน Jeng ผมรีบจัด ไม่ทันดู :)
แถมๆอันนี้น่าจะตรงตัวกว่านะ
http://www.spelecshop.com/1402480/404301/Temperature---Huminity-Sensor.html
:)