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安装 DHT 库

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安装 DHT 库 是 CoddyKit 上的免费 Arduino & IoT Academy 课时。 这是第 2 节课，共 4 节。 你可以在下方免费阅读本课时的完整内容 — 然后在浏览器中使用内置代码编辑器和全天候 AI 导师进行实践。 这是 Arduino & IoT Academy 学习路径的一部分，你的进度在网页和 CoddyKit 应用中同步。 Arduino & IoT Academy 课程共包含 4 节课。

本课时的部分内容尚未翻译，以英文显示。

Why Use a Library

Talking to a DHT by hand means tricky timing. A library hides that work so you can read climate data with one simple call. 📚

Open Library Manager

In the Arduino IDE, open the Library Manager from the Tools menu or the side panel. It is your store for ready-made code.

Search for DHT

Type DHT sensor library into the search box. The well-known one is published by Adafruit and works with both the DHT11 and DHT22.

It Has a Helper

The DHT library leans on the Adafruit Unified Sensor library. The IDE usually offers to install this dependency for you.

Click Install

Press Install and accept the prompt to add the dependency too. In a few seconds both libraries are ready to use.

Include It in Code

At the top of your sketch, pull the code in with #include. This line gives your program access to the DHT functions.

#include <DHT.h>

Tell It Your Pin

Define which pin the sensor uses and which type you own. Clear names up top make the rest of the sketch easy to read.

#define DHTPIN 2
#define DHTTYPE DHT11

Create the Object

Make a DHT object by passing your pin and type. This object is how you will ask for readings throughout the program.

DHT dht(DHTPIN, DHTTYPE);

Start It in setup

Inside setup, call dht.begin() once to wake the sensor. After this line the library is ready to take measurements.

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

Match Type to Hardware

Set DHTTYPE to DHT22 if that is your part. A mismatch here leads to wrong or failed readings, so pick the right one.

#define DHTTYPE DHT22

Restart If Hidden

If the IDE does not see your new library right away, restart it. A fresh start makes the included header resolve cleanly.

Quick Check

You installed the DHT library. Which call belongs in setup() before you can read values?

Recap

You installed the DHT library and its helper, included the header, set your pin and type, made the object, and called begin. 🎉

常见问题解答

「安装 DHT 库」课时是免费的吗？

是的 — 「安装 DHT 库」的完整文本可在网页上免费阅读。要进行交互式练习（内置代码编辑器和全天候 AI 导师）并解锁 Arduino & IoT Academy 课程的其余内容，请升级到 CoddyKit PRO。 Arduino & IoT Academy 课程共包含 4 节课。

「安装 DHT 库」这节课中我会学到什么？

添加库并在您的草图中引入它 你通过在浏览器中直接运行的动手代码来练习 Arduino & IoT Academy，全天候 AI 导师会在你学习这节课的过程中回答你的问题。

学习 Arduino & IoT Academy 需要有经验吗？

无需任何先前经验。CoddyKit 上的 Arduino & IoT Academy 课程适合初学者到高级学习者，你可以从这里开始或从头开始，按照自己的节奏学习。 这是第 2 节课，共 4 节。

「安装 DHT 库」课时需要多长时间？

大多数 CoddyKit 课程大约需要 5–10 分钟。每节课都很精短且互动，所以你能稳步进步，并在网页和应用中从离开的地方继续。

我能在这节 Arduino & IoT Academy 课中编写并运行代码吗？

能。每节 Arduino & IoT Academy 课都包含内置代码编辑器，你可以在浏览器中直接编写并运行真实代码，并获得即时 AI 反馈 — 无需本地设置。

此课程中的所有课时

  1. 连接 DHT11/DHT22
  2. 安装 DHT 库
  3. 读取温度与湿度
  4. 处理读取失败
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