将实时数据推送到仪表盘
在线实时绘制传感器数值
将实时数据推送到仪表盘 是 CoddyKit 上的免费 Arduino & IoT Academy 课时。 这是第 3 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 Goal: Live Charts
Now you will send real readings up to the cloud and watch them appear as a live chart updating in your browser. 📈
Connect WiFi First
Before any upload, your board must join the network. Call WiFi.begin with your name and password, then wait until it connects.
WiFi.begin(ssid, password);Pick a Field for Each Value
A ThingSpeak channel has numbered fields. Temperature might be field 1, humidity field 2, so each sensor gets its own line.
Build the Update URL
To send data the simple way, you build a URL with your key and field value. The server reads it and stores the number.
String url = "/update?api_key=" + key + "&field1=" + value;Make the HTTP Request
An HTTP GET to that URL pushes your reading. Libraries like HTTPClient turn this into just a couple of clean calls.
http.begin(client, fullUrl);
http.GET();Read the Response Code
A status code of 200 means success. Anything else, like 401, tells you the key was wrong or the request failed.
Respect the Rate Limit
Free ThingSpeak accepts one update every 15 seconds. Send faster and extra points are simply dropped, so pace your loop.
Use the Official Library
The ThingSpeak library is even easier. You set each field, then call one function to write them all at once.
ThingSpeak.setField(1, temperature);
ThingSpeak.writeFields(channelID, apiKey);Add a Chart Widget
On the website, each field can show as a chart. As new data arrives, the graph redraws so you watch trends form live.
Confirm It Worked
Open your channel page and refresh. If your latest reading appears with a fresh timestamp, the round trip is working. 🎉
Don't Block the Whole Loop
Use millis timing instead of a long delay between uploads. That keeps the board responsive while it waits to send again.
Quick Check
How often can a free ThingSpeak account accept a new update?
Recap
Connect WiFi, set each field, then write to your channel and watch live charts. Check the 200 response and respect the rate limit.
常见问题解答
「将实时数据推送到仪表盘」课时是免费的吗？
是的 — 「将实时数据推送到仪表盘」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。
「将实时数据推送到仪表盘」这节课中我会学到什么？
在线实时绘制传感器数值 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 3 节课，共 4 节。
「将实时数据推送到仪表盘」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。