ESP8266-Arduino编程实例-DHT12温度湿度传感器驱动

DHT12温度湿度传感器驱动

1、DHT12介绍

DHt12是经典DHT11温湿度传感器的升级版，完全向下兼容，精度更高，增加了I2C接口。有如下特性：

  • 紧凑的尺寸
  • 低功耗
  • 低电压操作
  • 标准 I2C 和 1 线接口。
  • 感应范围
    • 温度：-20～+60℃
    • 湿度：20-95 RH
  • 湿度：
    • 分辨率：0.1%RH
    • 重复：-+ 1%RH
    • 精度 25C @ -+5RH
  • 温度：
    • 分辨率：0.1C
    • 重复：-+0.2C
    • 精度：25C@-+0.5C
  • 电源：DC 2.7-5.5V
  • 正常电流1mA
  • 待机电流 60uA
  • 采样周期：> 2 秒

在这里插入图片描述

2、硬件准备

  • ESP8266 NodeMCU开发板一块
  • SHT21传感器模块一个
  • 面板板一个
  • 杜邦线若干
  • 数据线一条

硬件接线如下：

传感器引脚 ESP8266开发板引脚
Vin 5v
Gnd Gnd
SCL D1
SDA D2

3、软件准备

  • Arduino IDE或VSCode + PlatformIO

在前面的文章中，对如何搭建ESP8266开发环境做了详细的介绍，请参考：

ESP8266 NodeMCU的引脚介绍在前面的文章中做了详细的介绍，请参考：

4、代码实现

本次实例使用DHT12的驱动库如下：

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#include "Arduino.h"
 
#include <DHT12.h>
 
// Set dht12 i2c comunication on default Wire pin
DHT12 dht12;
 
void setup()
{
    Serial.begin(112560);
    // Start sensor handshake
    dht12.begin();
}

int timeSinceLastRead = 0;
 
void loop()
{
    // Report every 2 seconds.
    if(timeSinceLastRead > 2000) {
        // Reading temperature or humidity takes about 250 milliseconds!
        // Read temperature as Celsius (the default)
        float t12 = dht12.readTemperature();
        // Read temperature as Fahrenheit (isFahrenheit = true)
        float f12 = dht12.readTemperature(true);
        // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)
        float h12 = dht12.readHumidity();

        bool dht12Read = true;
        // Check if any reads failed and exit early (to try again).
        if (isnan(h12) || isnan(t12) || isnan(f12)) {
        Serial.println("Failed to read from DHT12 sensor!");

        dht12Read = false;
    }

    if (dht12Read){
        // Compute heat index in Fahrenheit (the default)
        float hif12 = dht12.computeHeatIndex(f12, h12);
        // Compute heat index in Celsius (isFahreheit = false)
        float hic12 = dht12.computeHeatIndex(t12, h12, false);
        // Compute dew point in Fahrenheit (the default)
        float dpf12 = dht12.dewPoint(f12, h12);
        // Compute dew point in Celsius (isFahreheit = false)
        float dpc12 = dht12.dewPoint(t12, h12, false);


        Serial.print("DHT12=> Humidity: ");
        Serial.print(h12);
        Serial.print(" %\t");
        Serial.print("Temperature: ");
        Serial.print(t12);
        Serial.print(" \*C ");
        Serial.print(f12);
        Serial.print(" \*F\t");
        Serial.print(" Heat index: ");
        Serial.print(hic12);
        Serial.print(" \*C ");
        Serial.print(hif12);
        Serial.print(" \*F");
        Serial.print(" Dew point: ");
        Serial.print(dpc12);
        Serial.print(" \*C ");
        Serial.print(dpf12);
        Serial.println(" \*F");
    }
    timeSinceLastRead = 0;
    delay(100);
    timeSinceLastRead += 100;
 
}

文章来源: https://iotsmart.blog.csdn.net/article/details/126458848