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Now you will send real readings up to the cloud and watch them appear as a live chart updating in your browser. 📈

Before any upload, your board must join the network. Call WiFi.begin with your name and password, then wait until it connects.

A ThingSpeak channel has numbered fields. Temperature might be field 1, humidity field 2, so each sensor gets its own line.

To send data the simple way, you build a URL with your key and field value. The server reads it and stores the number.

An HTTP GET to that URL pushes your reading. Libraries like HTTPClient turn this into just a couple of clean calls.

A status code of 200 means success. Anything else, like 401, tells you the key was wrong or the request failed.

Free ThingSpeak accepts one update every 15 seconds. Send faster and extra points are simply dropped, so pace your loop.

The ThingSpeak library is even easier. You set each field, then call one function to write them all at once.

On the website, each field can show as a chart. As new data arrives, the graph redraws so you watch trends form live.

Open your channel page and refresh. If your latest reading appears with a fresh timestamp, the round trip is working. 🎉

Use millis timing instead of a long delay between uploads. That keeps the board responsive while it waits to send again.

How often can a free ThingSpeak account accept a new update?

Connect WiFi, set each field, then write to your channel and watch live charts. Check the 200 response and respect the rate limit.