【合宙ESP32C3】DHT11温湿度传感器

我买的DHT11模块自带上拉电阻（1k），若你买的只是模块，直接读取可能读取不到温度，需要自行接一个上拉电阻（1k~10k都行）到模块的DATA引脚。

1、添加DHT库：

找到Adafruit的DHT_sensor_library，并安装

2、选择例程：

3、例如我们要把DHT11的DATA口接到合宙ESP32C3的GPIO4口：

接线方式：

合宙ESP32C3	DHT11
VCC（3.3V）	VCC
GND	GND
GPIO4	DATA

例程代码：（记得更改GPIO管脚定义，程序与接线对应，我这里接线GPIO4，例程仅需更改宏定义#define DHTPIN 4）

#include "DHT.h"#define DHTPIN 4     // Digital pin connected to the DHT sensor
// Feather HUZZAH ESP8266 note: use pins 3, 4, 5, 12, 13 or 14 --
// Pin 15 can work but DHT must be disconnected during program upload.// Uncomment whatever type you're using!
#define DHTTYPE DHT11   // DHT 11
//#define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
//#define DHTTYPE DHT21   // DHT 21 (AM2301)// Connect pin 1 (on the left) of the sensor to +5V
// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1
// to 3.3V instead of 5V!
// Connect pin 2 of the sensor to whatever your DHTPIN is
// Connect pin 3 (on the right) of the sensor to GROUND (if your sensor has 3 pins)
// Connect pin 4 (on the right) of the sensor to GROUND and leave the pin 3 EMPTY (if your sensor has 4 pins)
// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor// Initialize DHT sensor.
// Note that older versions of this library took an optional third parameter to
// tweak the timings for faster processors.  This parameter is no longer needed
// as the current DHT reading algorithm adjusts itself to work on faster procs.
DHT dht(DHTPIN, DHTTYPE);void setup() {Serial.begin(9600);Serial.println(F("DHTxx test!"));dht.begin();
}void loop() {// Wait a few seconds between measurements.delay(2000);// Reading temperature or humidity takes about 250 milliseconds!// Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)float h = dht.readHumidity();// Read temperature as Celsius (the default)float t = dht.readTemperature();// Read temperature as Fahrenheit (isFahrenheit = true)float f = dht.readTemperature(true);// Check if any reads failed and exit early (to try again).if (isnan(h) || isnan(t) || isnan(f)) {Serial.println(F("Failed to read from DHT sensor!"));return;}// Compute heat index in Fahrenheit (the default)float hif = dht.computeHeatIndex(f, h);// Compute heat index in Celsius (isFahreheit = false)float hic = dht.computeHeatIndex(t, h, false);Serial.print(F("Humidity: "));Serial.print(h);Serial.print(F("%  Temperature: "));Serial.print(t);Serial.print(F("°C "));Serial.print(f);Serial.print(F("°F  Heat index: "));Serial.print(hic);Serial.print(F("°C "));Serial.print(hif);Serial.println(F("°F"));
}

编译下载运行结果：

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