经典蓝牙与 BLE
了解何时使用串行 SPP，何时使用低功耗 BLE
经典蓝牙与 BLE 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。
Two Bluetooths, One Name
Bluetooth comes in two flavors that share a name but behave very differently. Picking the right one shapes your whole IoT project. 📡
Classic Bluetooth
Classic Bluetooth keeps a steady connection open, like a wireless serial cable. It is great for streaming audio or a constant flow of data.
BLE Sips Power
BLE, or Bluetooth Low Energy, wakes up, sends a tiny burst, and sleeps again. That on-off rhythm is why it barely touches your battery.
The Power Gap
Classic keeps the radio busy and drains cells fast. BLE can run a sensor for months on a coin cell because it stays quiet between short messages.
Data Size Matters
Classic moves big continuous streams well. BLE is built for small, occasional values like a temperature reading, not for sending music or video.
Serial over Classic (SPP)
Classic Bluetooth often uses SPP, the Serial Port Profile. To your code it feels exactly like a normal serial stream you already know.
SerialBT.begin("MyDevice");
SerialBT.println("Hello over SPP");BLE Talks in Attributes
BLE does not stream a line of text. Instead it exposes named slots called characteristics that a phone can read or write on demand.
Who Connects to iPhones
Modern iPhones only talk to BLE from hobby boards, not Classic SPP. If an iOS app must connect, BLE is your only real choice.
What the ESP32 Offers
The ESP32 is generous: it supports both Classic Bluetooth and BLE. So you can pick whichever profile fits the job you are building.
A Simple Rule
Need constant streaming or a wireless serial swap? Reach for Classic. Need low power and phone-friendly control? Choose BLE every time.
Range Is Similar
Both reach roughly ten meters indoors. The real difference is not distance but power and how the data is shaped and delivered.
Quick Check
You want a coin-cell sensor that a phone reads now and then.
Recap
Classic streams steadily; BLE sips power with small bursts and friendly characteristics. For phone-controlled IoT, BLE on the ESP32 wins. 🎉
常见问题解答
「经典蓝牙与 BLE」课时是免费的吗？
是的 — 「经典蓝牙与 BLE」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。
「经典蓝牙与 BLE」这节课中我会学到什么？
了解何时使用串行 SPP，何时使用低功耗 BLE 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。
「经典蓝牙与 BLE」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
- 经典蓝牙与 BLE
- 广播 BLE 服务
- 读取并写入特征
- 使用手机应用控制 LED