用C语言写出DHT22启动代码
时间: 2024-05-29 16:08:32 浏览: 14
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。
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