用C语言写出DHT22代码
时间: 2024-06-07 11:05:08 浏览: 20
当然,我可以为您提供DHT22的C语言代码:
#include <dht.h>
dht DHT;
#define DHTPIN 7 //定义DHT22传感器连接的引脚
void setup() {
Serial.begin(9600);
Serial.println("DHT22测试");
DHT.begin();
}
void loop() {
delay(2000);
int chk = DHT.read22(DHTPIN);
Serial.print("湿度: ");
Serial.print(DHT.humidity);
Serial.print("%温度: ");
Serial.print(DHT.temperature);
Serial.println("*C ");
}
然而,我并不是一个编程软件,我是一个AI语言模型,所以我并不能像程序员那样编写代码。如果您有其他问题需要帮助,欢迎继续咨询!
相关问题
用C语言写出DHT22启动代码
当然,我很乐意为您提供代码示例。以下是一个简单的DHT22启动代码示例,使用C语言编写:
#include <wiringPi.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdbool.h>
#define MAX_TIMINGS 85
#define DHT_PIN 7
int main(void) {
if (wiringPiSetupGpio() == -1) {
exit(1);
}
uint8_t data[5] = {0, 0, 0, 0, 0};
while (true) {
uint8_t last_state = HIGH;
uint8_t counter = 0;
pinMode(DHT_PIN, OUTPUT);
digitalWrite(DHT_PIN, LOW);
delay(18);
digitalWrite(DHT_PIN, HIGH);
delayMicroseconds(30);
pinMode(DHT_PIN, INPUT);
for (int i = 0; i < MAX_TIMINGS; i++) {
counter = 0;
while (digitalRead(DHT_PIN) == last_state) {
counter++;
delayMicroseconds(1);
if (counter == 255) {
break;
}
}
last_state = digitalRead(DHT_PIN);
if (counter == 255) {
break;
}
if ((i >= 4) && (i % 2 == 0)) {
data[(i - 4) / 2] = counter;
}
}
if (data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF)) {
float humidity = (float)((data[0] << 8) + data[1]) / 10.0;
float temperature = (float)(((data[2] & 0x7F) << 8) + data[3]) / 10.0;
if (data[2] & 0x80) {
temperature *= -1;
}
printf("Humidity: %.1f %% Temperature: %.1f C\n", humidity, temperature);
} else {
printf("Data not good, skip\n");
}
delay(2000);
}
return 0;
}
希望这段代码能帮到你,有任何问题可以随时向我提问。
树莓派dht11代码C语言代码
以下是树莓派上使用wiringPi库读取DHT11传感器数据的C语言代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <wiringPi.h>
#define MAX_TIME 85
#define DHT11PIN 7
int dht11_val[5]={0,0,0,0,0};
void dht11_read_val()
{
unsigned char lststate=HIGH;
unsigned char counter=0;
unsigned char j=0,i;
for(i=0;i<5;i++)
dht11_val[i]=0;
pinMode(DHT11PIN,OUTPUT);
digitalWrite(DHT11PIN,LOW);
delay(18);
digitalWrite(DHT11PIN,HIGH);
delayMicroseconds(40);
pinMode(DHT11PIN,INPUT);
for(i=0;i<MAX_TIME;i++)
{
counter=0;
while(digitalRead(DHT11PIN)==lststate)
{
counter++;
delayMicroseconds(1);
if(counter==255)
break;
}
lststate=digitalRead(DHT11PIN);
if(counter==255)
break;
if((i>=4)&&(i%2==0))
{
dht11_val[j/8]<<=1;
if(counter>16)
dht11_val[j/8]|=1;
j++;
}
}
if((j>=40)&&(dht11_val[4]==((dht11_val[0]+dht11_val[1]+dht11_val[2]+dht11_val[3])& 0xff)))
printf("Humidity = %d.%d %% Temperature = %d.%d *C\n",dht11_val[0],dht11_val[1],dht11_val[2],dht11_val[3]);
else
printf("Invalid Data!!\n");
}
int main(void)
{
if(wiringPiSetup()==-1)
exit(1);
while(1)
{
dht11_read_val();
delay(5000);
}
return 0;
}
```
该代码通过wiringPi库中的GPIO控制函数,读取DHT11传感器的输出,实现了温湿度的测量。在主函数中,通过循环执行dht11_read_val()函数,实现了每隔五秒钟测量一次温湿度的功能。