写一个DHT11型号的温湿度传感器驱动函数
时间: 2024-05-03 20:16:44 浏览: 9
好的,以下是一个简单的DHT11温湿度传感器的驱动函数示例(使用C语言):
```
#include <stdio.h>
#include <wiringPi.h>
#define MAX_TIMINGS 85
#define DHT_PIN 7
int data[5] = { 0, 0, 0, 0, 0 };
void read_dht11_data()
{
uint8_t last_state = HIGH;
uint8_t counter = 0;
uint8_t j = 0, i;
data[0] = data[1] = data[2] = data[3] = data[4] = 0;
pinMode(DHT_PIN, OUTPUT);
digitalWrite(DHT_PIN, LOW);
delay(18);
digitalWrite(DHT_PIN, HIGH);
delayMicroseconds(40);
pinMode(DHT_PIN, INPUT);
for (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[j / 8] <<= 1;
if (counter > 16) data[j / 8] |= 1;
j++;
}
}
if ((j >= 40) &&
(data[4] == ((data[0] + data[1] + data[2] + data[3]) & 0xFF))) {
printf("Humidity = %d.%d %% Temperature = %d.%d *C \n",
data[0], data[1], data[2], data[3]);
}
else {
printf("Data not good, skip\n");
}
}
int main(void)
{
printf("Raspberry Pi wiringPi DHT11 Temperature test program\n");
if (wiringPiSetup() == -1) {
printf("Failed to setup wiringPi\n");
return -1;
}
while (1) {
read_dht11_data();
delay(2000);
}
return 0;
}
```
这个函数使用WiringPi库来控制树莓派GPIO引脚,并读取DHT11传感器的数据。在主函数中,我们重复调用read_dht11_data函数以获取传感器的温度和湿度数据。