连接 DHT11/DHT22
连接数据线、电源线和上拉电阻
连接 DHT11/DHT22 是 CoddyKit 上的免费 Arduino & IoT Academy 课时。 这是第 1 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。
Meet the DHT Sensor
A DHT sensor measures both temperature and humidity in one tiny package. It is the friendliest way to give your project a sense of climate. 🌡️
DHT11 vs DHT22
The DHT11 is cheap and good enough for hobby projects. The DHT22 costs a bit more but reads a wider range with better accuracy.
Just One Data Pin
What makes DHT lovely is its single data pin. One wire carries both readings to your board, so wiring stays simple.
Three Pins to Know
A bare DHT has three useful pins: VCC for power, GND for ground, and DATA for the signal. A fourth pin is usually unused.
Power It Correctly
Connect VCC to the 5V pin on your Arduino and GND to a ground pin. Get this right first, or the sensor stays silent.
The Data Line
Run the DATA pin to any digital pin you like, such as pin 2. You will name this exact pin later in your code.
#define DHTPIN 2Add a Pull-Up Resistor
The data line needs a pull-up resistor, about 10k ohms, between DATA and VCC. It keeps the idle signal clean and steady.
Why the Pull-Up Helps
Without that resistor, the data line can float and report scrambled values. The pull-up gives the line a reliable resting voltage.
Modules Make It Easy
Many DHT modules come on a small board with the resistor already soldered on. Then you only wire three pins and skip the resistor.
Mind the Orientation
Always check the pin labels printed on your sensor. Swapping VCC and GND can overheat the part, so look before you power up.
Double-Check Before Power
Trace each wire one more time: power, ground, and data to the right digital pin. A calm check now saves confusing readings later.
Quick Check
You are wiring a bare DHT11. What component does its data line need to stay reliable?
Recap
You met the DHT family, wired VCC, GND, and a data pin, and added a 10k pull-up so the signal stays clean and trustworthy. 🎉
常见问题解答
「连接 DHT11/DHT22」课时是免费的吗？
是的 — 「连接 DHT11/DHT22」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。
「连接 DHT11/DHT22」这节课中我会学到什么？
连接数据线、电源线和上拉电阻 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 1 节课，共 4 节。
「连接 DHT11/DHT22」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。