12-Development Board access Small Five things to achieve remote control (STM32 acquisition temperature and humidity sensor DHT11)

Collect DHT11 temperature and humidity data, use STM32F103ZET6 GPIOG11 pin to read SHT11 data, print the temperature and humidity of the collection via serial port

dht11.c file:

#include"Dht11.h"#include"Delay.h"//Reset DHT11voidDht11_rst (void) {dht11_io_out (); //SET OUTPUTdht11_dq_out=0;//Pull Low DQDelay_ms ( -);//pull down at least 18msdht11_dq_out=1;//dq=1Delay_us ( -);//main engine Pull high 20~40us}//waiting for DHT11 's response//return 1: The presence of DHT11 is not detected//return 0: PresenceU8 Dht11_check (void) {U8 Retry=0; Dht11_io_in ();//SET INPUT     while(dht11_dq_in&&retry< -)//DHT11 will pull down 40~80us .{Retry++; Delay_us (1);         }; if(retry>= -)return 1; Elseretry=0;  while(! dht11_dq_in&&retry< -)//DHT11 will pull up again after the low 40~80us{Retry++; Delay_us (1);    }; if(retry>= -)return 1; return 0;}//read a bit from DHT11//return value: 1/0U8 Dht11_read_bit (void) {U8 Retry=0;  while(dht11_dq_in&&retry< -)//wait becomes low level{Retry++; Delay_us (1); } Retry=0;  while(! dht11_dq_in&&retry< -)//wait for the high level to change{Retry++; Delay_us (1); } delay_us ( +);//wait 40us    if(dht11_dq_in)return 1; Else return 0; }//read a byte from DHT11//return value: The data readU8 Dht11_read_byte (void) {U8 i,dat; DAT=0;  for(i=0;i<8; i++) {dat<<=1; DAT|=dht11_read_bit (); }                                returndat;}//read data once from DHT11//Temp: Temperature Value (range: 0~50°)//Humi: Humidity value (range: 20%~90%)//return value: 0, normal; 1, read failedU8 Dht11_read_data (U8 *temp,u8 *Humi) {U8 buf[5];    U8 I;    Dht11_rst (); if(Dht11_check () = =0)    {         for(i=0;i<5; i++)//read 40-bit data{Buf[i]=Dht11_read_byte (); }        if((buf[0]+buf[1]+buf[2]+buf[3]) ==buf[4])        {            *humi=buf[0]; *temp=buf[2]; }    }Else return 1; return 0; }//Initialize DHT11 IO port DQ to detect the presence of DHT11 simultaneously//return 1: not present//return 0: PresenceU8 Dht11_init (void) {gpio_inittypedef gpio_initstructure;     Rcc_apb2periphclockcmd (Rcc_apb2periph_gpiog, ENABLE); //Enable PG Port ClockGpio_initstructure.gpio_pin= Gpio_pin_11;//PG11 Port ConfigurationGpio_initstructure.gpio_mode = gpio_mode_out_pp;//push-Pull outputGpio_initstructure.gpio_speed =Gpio_speed_50mhz; Gpio_init (Gpiog,&gpio_initstructure);//Initialize IO portGpio_setbits (Gpiog,gpio_pin_11);//PG11 Output HighDht11_rst (); //Reset DHT11    returnDht11_check ();//waiting for DHT11 's response}

Dht11.h file

#ifndef __dht11_h#define__dht11_h#include"Sys.h"   //io Direction setting#defineDht11_io_in () {gpiog->crh&=0xffff0fff; gpiog->crh|=8<<12;}#defineDht11_io_out () {gpiog->crh&=0xffff0fff; gpiog->crh|=3<<12;}////io operation function#defineDht11_dq_out Pgout (11)//Data Port#defineDht11_dq_in Pgin (11)//Data PortU8 Dht11_init (void);//Initialize DHT11U8 Dht11_read_data (U8 *temp,u8 *humi);//read temperature and humidity levelU8 Dht11_read_byte (void);//read out a byteU8 Dht11_read_bit (void);//read out a bitU8 Dht11_check (void);//detect if DHT11 existsvoidDht11_rst (void);//Reset DHT11#endif

MAIN.C file:

#include"led.h"#include"Delay.h"#include"Sys.h"#include"usart.h"#include"Dht11.h"       intMainvoid) {U8 T=0;              U8 temperature;               U8 Humidity;             Delay_init (); //initialization of the delay functionNvic_prioritygroupconfig (nvic_prioritygroup_2);//set interrupt Priority group to group 2:2-bit preemption priority, 2-bit response priorityUart_init (115200);//serial port initialized to 115200Led_init ();//initializing the hardware interface to the LED connection          while(Dht11_init ())//DHT11 Initialization{printf ("DHT11 error\r\n"); Delay_ms ( the); }                                             while(1)    {                         if(t% -==0)//Read once per 100ms{dht11_read_data (&temperature,&humidity);//read temperature and humidity valuesprintf"\ r \ n temperature:%d\r\n", temperature); printf ("Humidity:%d\r\n", humidity); } Delay_ms (Ten); T++; if(t== $) {T=0; LED0=!LED0; }    }}

Serial Reception Effect:

SOURCE Link: https://pan.baidu.com/s/1vyIc6Zu2OOWwDsgLQonKKw

Extract code: Yolu

12-Development Board access Small Five things to achieve remote control (STM32 acquisition temperature and humidity sensor DHT11)