Arduino project · Temperature and climate · Medium
Cloud Temperature Logger (Wi-Fi)
The Arduino reads the temperature and sends it to a ThingSpeak graph on the internet.
What you will learn
- How an ESP-01 gives an Arduino Wi-Fi
- What a cloud channel and a field are
- How IoT data logging works
How it works
The Map step copies the temperature into the Wi-Fi module value. The code sends it to ThingSpeak at most once every 16 seconds. The Link monitor under the circuit shows each upload. Fill in your own Wi-Fi name, password and ThingSpeak keys in the sketch.
Try this next
- Log two fields (temperature and humidity).
- Add an alarm when it is too hot.
- Share the graph on a web page.
The simulator program and explanation on this page are original. The idea follows a classic Arduino project that students have built for years.
Parts: sensors and actuators (tap to show or hide)
Try the inputs (virtual sensors)
Pins (you can change them)
| Part | Arduino pin (change it here) | How to wire it |
|---|
Every wire, one by one
Red rail = 5 V from the Arduino 5V pin. Black rail = GND. The coloured wires carry signals. Match the wire colours on the drawing to this list.
| # | Colour | From (part and leg) | To |
|---|
Steps run from top to bottom, then start again. While the simulation runs, the active step is highlighted in green.
Quantities come from the parts you added. The store links open a search for that item on Robu.in, Amazon.in and ThinkRobotics, so you always see what is in stock today. Check the model, voltage and price before you order.
| # | Item | Qty | Search term | Buy / compare |
|---|
The PDF has the circuit sketch, pin table, every wire, sequence, full code, the parts list with store links, do’s and don’ts for each part, and the safety notes. The project file lets you come back and keep editing.
In the real world
A thermometer on the wall
Move the temperature slider. The mercury in the real thermometer follows.
Tip: use the gold tab at the bottom of the circuit drawing to pull the real-world view up over the Arduino board. Your parts stay visible above it, so you can press a button and watch the real scene react.
- Temperature sensor = the room temperature