Weather Station

A compact DIY weather station based on the ESP32-C3 SuperMini, featuring a color TFT display, online weather data, and local temperature & humidity measurement.

The project is designed to be simple, energy-efficient, and fully standalone, suitable for desktop use or as a portable weather monitor.

Hardware Used

Main Components

Microcontroller: ESP32-C3 SuperMini

Display: 1.8" TFT (ST7735, 128×160)

Temperature & Humidity Sensor: SHT31 (I2C)

Button: 6×6 mm tactile switch

Power: 450 mAh Li-ion battery (e.g. from disposable vape)

Other: wires, solder, solder paste

Before Flashing the Firmware

Before uploading the firmware, you must edit the settings.h file.

1. Wi-Fi Configuration

Enter your Wi-Fi credentials:

constexpr char SSID[] = "your_wifi_name";

constexpr char PASSWORD[] = "your_password";

Without this, the device will not be able to retrieve weather data.

2. Location Settings

Set your geographic coordinates for accurate weather data:

constexpr double LATITUDE = 45.493525;

constexpr double LONGITUDE = 15.565131;

You can find your coordinates using Google Maps or any online GPS service.

How It Works

Operating Modes

The device has two modes, switched using a single button:

Indoor Mode

Displays real-time temperature and humidity

Data is read directly from the SHT31 sensor

Outdoor Mode

Connects to Wi-Fi

Downloads weather data from the met.no API

Uses coordinates defined in settings.h

Power Saving

The project is optimized for battery operation:

After 5 seconds — display brightness is reduced to 2%

After 20 seconds — device enters Deep Sleep

Wake-up occurs via button press

This allows long battery life even with a small Li-ion cell.

Weather API Information (met.no)

This project uses the official API of the Norwegian Meteorological Institute.

Key advantages:

Works worldwide

No API key required

High accuracy

Free and open access

Technical notes:

Europe and Scandinavia use high-resolution 1×1 km models

Global coverage is provided via ECMWF data

One of the most reliable public weather APIs available

Because of this, the project works anywhere in the world — just enter your coordinates.

Pinout

Component Module Pin ESP32-C3 GPIO Description

TFT Display SCL (SCLK) GPIO 7 SPI Clock

SDA (MOSI) GPIO 9 SPI Data

RES GPIO 4 Reset

DC GPIO 5 Data / Command

CS GPIO 6 Chip Select

LED (BLK) GPIO 3 Backlight (PWM)

SHT31 Sensor SDA GPIO 2 I2C Data

SCL GPIO 0 I2C Clock

Button S1 GPIO 1 Mode switch

Summary

Compact and low-power design

Works worldwide

No API keys required

Simple hardware

Ideal for learning ESP32 + IoT

Clean and minimal wiring

The ESP32-C3 SuperMini fits perfectly behind the display, making the entire device small, clean, and portable.

Git link (sketch files) is in "How to flash.txt"

Weather station

0.2mm layer, 2 walls, 15% infill

0.2mm layer, 2 walls, 15% infill