108个传感器之- 温湿度模块DHT11（14）

介绍

DHT11传感器是紧凑设计的温度和湿度传感器的组合。它以±2°C的精度测量0°C至50°C的温度，以±5%的精度测量20%至90%的相对湿度。由于其低采样率，该传感器每两秒钟只提供一次新的读数，使其成为长期测量的理想选择。DHT11易于集成到Arduino和Raspberry Pi等微控制器平台中，并且由于工厂校准，不需要额外的校准。其稳健的设计和可靠性使其成为温室、气候控制系统和仓库监控等连续监测项目的最佳选择。

Technical Data
Chipset	DHT11
Communication Protocol	1-Wire
Measuring range	0 °C to 50 °C
Measurement accuracy	±2 °C
Measurement Accuracy	±5 % RH
Measurable humidity	20-90 % RH

引脚连接

pin 引脚连接开发板的 gpio 接口即可：

Arduino	Sensor
pin 2	Signal
-	+V
GND	GND

代码示例

1. 普通版

该案例用到以下两个库：

• DHT-sensor-library
• Adafruit Unified Sensor

#include <Adafruit_Sensor.h>
#include <DHT.h>
#include <DHT_U.h>

#define DHTPIN A2
#define DHTTYPE DHT11   // DHT 11
DHT dht(DHTPIN, DHTTYPE);

void setup() {
  Serial.begin(9600);
  dht.begin();
}

void loop() {
  delay(1000);
  // Humidity is measured
  float humidity = dht.readHumidity();
  // Temperature is measured
  float temperature = dht.readTemperature();
  // Checks whether the measurements have run through without errors
  // If an error is detected, an error message is output here
  if (isnan(humidity) || isnan(temperature)) {
    Serial.println("Error when reading out the sensor");
    return;
  }
  // Output to the serial console
  Serial.println("-----------------------------------------------------------");
  Serial.print(" Humidity: ");
  Serial.print(humidity);
  Serial.print(" %\t");
  Serial.print(" Temperature: ");
  Serial.print(temperature);
  Serial.println(" °C ");
  Serial.println("-----------------------------------------------------------");
  Serial.println(" ");
}

小结

待完善…