Build a weather station

Measure temperature, humidity and light, show them on a small screen with the day's highs and lows, and work out how hot it really feels.

Time1–2 weekends

Parts₹855–900

Temperature and humidity on the Serial Monitor5 wires, 8 actions · read it below
Readings on the screen4 wires, 8 actions
Highs and lows5 actions
Feels like6 actions
Light level5 wires, 6 actions
Sited and checked6 actions

Start this build

Free. Make an account and you come straight back to start it.

Before you start

Tools: Laptop with the Arduino IDE, USB phone charger or power bank, A thermometer to compare against (optional), Soldering iron, only if your screen comes without its pins soldered on, A small box or cup you can cut air holes in
Skills: A first Arduino project. Steps 1–5 use code (or Get the code); step 6 is placing and checking it. Some screens arrive with their 4 pins not soldered on: buy one with pins fitted if you can't solder.
Safety: Low voltage: 5 V from USB. Keep the electronics dry: indoors, or outdoors only under a roof, never in the rain. If you solder the screen's pins, the iron is hot: use its stand.
Prices: Checked 2026-10, with a clone Uno, a DHT11, a USB cable, a breadboard and jumper wires; the top figure swaps in a DHT22; an original Uno adds about ₹1,950

Step 1 of 6

Temperature and humidity on the Serial Monitor

Your Arduino reads the DHT11 and prints temperature and humidity every 2 seconds.

Build it

Task 01 of 08

In the Arduino IDE, open Library Manager and install 'DHT sensor library' by Adafruit. Say yes when it offers to install 'Adafruit Unified Sensor' too.

Check: File > Examples now has a 'DHT sensor library' folder.

Steps
Wires · 5
Steps

You need

Arduino Uno R3 and USB cable
DHT11 temperature and humidity module (3 pins), or a DHT22
Breadboard
Jumper wires (male-to-male and male-to-female)
A piece of stiff cardboard or a wooden board to stick everything on (optional)

Uno GND
Uno 5V
Uno pin 2
DHT11 − (GND)
DHT11 + (VCC)
DHT11 OUT (DATA or S)

Breadboard − rail
Breadboard + rail

Serial monitor

9600 baud

Expect to see

The start message, once the sketch starts: not seen yetWeather station starting...
Temperature and humidity, a new line every 2 s: not seen yetTemperature 24.0 C Humidity 55 %

Get the codeThe full sketch comes with the build.

Build a weather station

Parts list

Temperature and humidity on the Serial Monitor

Build it

Serial monitor