DHT11温湿度传感器，显示的值永远为104，初始化ok，应该是读数据出现问题？求解

核弹技术哪家强 · 发表于 2015-7-5 17:25:43

[mw_shl_code=c,true]DHT11代码和主函数代码如下，已经纠结了几天了，找不到原因，原子的原程序改的[/mw_shl_code] [mw_shl_code=c,true]DHT11函数[/mw_shl_code] [mw_shl_code=c,true][/mw_shl_code] [mw_shl_code=c,true]#include "dht11.h" #include "delay.h" void DHT11_Rst(void) { DHT11_IO_OUT(); //SET OUTPUT DHT11_DQ_OUT=0; delay_ms(30); DHT11_DQ_OUT=1; //DQ=1 delay_us(50); } u8 DHT11_Check(void) { u8 retry=0; DHT11_IO_IN();//SET INPUT while (DHT11_DQ_IN&&retry<100) { retry++; delay_us(1); }; if(retry>=100)return 1; else retry=0; while (!DHT11_DQ_IN&&retry<100) { retry++; delay_us(1); }; if(retry>=100)return 1; return 0; } u8 DHT11_Read_Bit(void) { u8 retry=0; while(DHT11_DQ_IN&&retry<100) { retry++; delay_us(1); } retry=0; while(!DHT11_DQ_IN&&retry<100) { retry++; delay_us(1); } delay_us(40); if(DHT11_DQ_IN)return 1; else return 0; } u8 DHT11_Read_Byte(void) { u8 i,dat; dat=0; for (i=0;i<8;i++) { dat<<=1; dat|=DHT11_Read_Bit(); } return dat; } u8 DHT11_Read_Data(u8 *temp,u8 *humi) { u8 buf[5]; u8 i; DHT11_Rst(); if(DHT11_Check()==0) { for(i=0;i<5;i++) { buf=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; } u8 DHT11_Init(void) { GPIO_InitTypeDef GPIO_InitStructure; RCC_APB2PeriphClockCmd(RCC_APB2Periph_GPIOA, ENABLE); GPIO_InitStructure.GPIO_Pin = GPIO_Pin_11; GPIO_InitStructure.GPIO_Mode = GPIO_Mode_Out_PP; GPIO_InitStructure.GPIO_Speed = GPIO_Speed_50MHz; GPIO_Init(GPIOA, &GPIO_InitStructure); GPIO_SetBits(GPIOA,GPIO_Pin_11); DHT11_Rst(); return DHT11_Check(); } [/mw_shl_code] [mw_shl_code=c,true][/mw_shl_code] [mw_shl_code=c,true]主函数[/mw_shl_code] [mw_shl_code=c,true][/mw_shl_code] [mw_shl_code=c,true]#include "led.h" #include "delay.h" #include "key.h" #include "sys.h" #include "12864.h" #include "usart.h" #include "dht11.h" int main(void) { u8 t=0; u8 temperature; u8 humidity; delay_init(); NVIC_Configuration(); uart_init(9600); LED_Init(); KEY_Init(); InitDis(); DisStr(1,1,"DHT11_测试"); while(DHT11_Init()) { DisStr(2,3,"DHT11 Error"); delay_ms(200); delay_ms(200); } DisStr(2,3,"DHT11 OK"); DisStr(3,1,"温度 C"); DisStr(4,1,"湿度 %"); while(1) { if(t%10==0) { DHT11_Read_Data(&temperature,&humidity); DisInt(3,4,temperature); DisInt(4,4,humidity); } printf("温度"); printf("%d\r\n",temperature); printf("湿度"); printf("%d\r\n",humidity); delay_ms(10); t++; if(t==20) { t=0; LED0=!LED0; } } } [/mw_shl_code] [mw_shl_code=c,true][/mw_shl_code]