Push Live Data to a Dashboard
Plot sensor values online in real time.
Push Live Data to a Dashboard is a free Arduino & IoT Academy lesson on CoddyKit — lesson 3 of 4. You can read the complete lesson below for free — then practise it hands-on in the browser with a built-in code editor and a 24/7 AI tutor. It is part of the Arduino & IoT Academy learning path, one of 4 lessons in the course, and your progress syncs across the web and the CoddyKit app.
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.
Frequently asked questions
Is the “Push Live Data to a Dashboard” lesson free?
Yes — the full text of “Push Live Data to a Dashboard” is free to read here on the web, and the Arduino & IoT Academy course includes 4 lessons in total. To practise it interactively (a built-in code editor and a 24/7 AI tutor) and unlock the rest of the Arduino & IoT Academy course, upgrade to CoddyKit PRO.
What will I learn in “Push Live Data to a Dashboard”?
Plot sensor values online in real time. You practise Arduino & IoT Academy with hands-on code you run directly in the browser, and a 24/7 AI tutor answers your questions as you work through the lesson.
Do I need any experience to start Arduino & IoT Academy?
No prior experience is required. Arduino & IoT Academy on CoddyKit is structured for beginners through advanced learners; this is — lesson 3 of 4, so you can start here or from the beginning and move at your own pace.
How long does the “Push Live Data to a Dashboard” lesson take?
Most CoddyKit lessons take about 5–10 minutes. Each one is bite-sized and interactive, so you make steady progress and pick up exactly where you left off across the web and the app.
Can I write and run code in this Arduino & IoT Academy lesson?
Yes. Every Arduino & IoT Academy lesson includes a built-in code editor, so you write and run real code right in your browser and get instant AI feedback — no local setup required.
All lessons in this course
- Choose a Cloud Platform
- Authenticate Your Device
- Push Live Data to a Dashboard
- Control Hardware from the Cloud