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loop() 永远运行

让逻辑不断重复的心跳

loop() 永远运行 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。

The Heartbeat

After setup finishes, the second block takes over. Meet loop(), the part of your sketch that never stops running. 🔁

Runs Over and Over

The key idea: loop() repeats endlessly. The board runs it, reaches the bottom, then jumps straight back to the top.

What loop() Looks Like

Just like setup, it returns void and holds your code inside curly braces. This is where your device's behavior lives.

void loop() {
  // repeating code goes here
}

Setup First, Then Loop

Order matters. The board runs setup() once, then hands control to loop forever. They are partners, not rivals.

A Blinking Example

Inside loop you might turn an LED on, wait, then off. The board repeats this, so the light blinks again and again.

void loop() {
  digitalWrite(13, HIGH);
  delay(500);
  digitalWrite(13, LOW);
  delay(500);
}

Reading Inputs Live

Because loop runs constantly, it can check sensors thousands of times a second. That is how your device stays responsive to the world.

No while(true) Needed

You do not write your own forever-loop. Arduino already repeats loop() for you, so just describe one pass of behavior.

It Never Truly Ends

loop only stops when power is cut or the board resets. As long as it has power, your loop() keeps cycling.

Order Inside Matters

Lines in loop run top to bottom each pass. Rearranging them changes the sequence of actions your device performs.

Empty Loop Is Allowed

An empty loop() compiles fine, but your device just sits idle. The braces are still required even with nothing inside.

void loop() {
}

Together They Are a Sketch

Every Arduino program needs both blocks: setup() to prepare and loop() to act. With these two, you can build anything.

void setup() {
}
void loop() {
}

Quick Check

Let's check how loop() behaves.

Recap: loop()

You learned that loop() runs forever after setup, repeating top to bottom. It is where your device senses and reacts on every pass. 🎉

常见问题解答

「loop() 永远运行」课时是免费的吗？

是的 — 「loop() 永远运行」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。

「loop() 永远运行」这节课中我会学到什么？

让逻辑不断重复的心跳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。

「loop() 永远运行」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。

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