Based on "Cheap Internet Weather Station using LilyGo T-Display S3" by Volos Projects.

ESP32 Internet Weather station project using the LilyGo T-Display S3.

It's fully integrated into the OpenWX Suite with: OpenWXSDR, OpenWXTTGO, OpenWXDeck and OpenWXFleetMonitor.

Parts used:

LilyGO T-Display S3 https://www.lilygo.cc/

Integrated Weatherstation configurable for different Weatherservices

Device UI displaying same detailed weather data

... but OpenWXStation is even more - It's a tiny and versatile Station Manager for your Radiosonde Decoder Gateways.

video_2026-09-27_00-46-26.mp4

Local Webserver hosted on T-Display S3 with OpenWXStation

Build with PlatformIO (VS Code)

1. Install the PlatformIO IDE extension in VS Code and open this folder (the one containing platformio.ini).
2. Build: PlatformIO toolbar ✓ (or pio run). Libraries and the ESP32 core (Arduino 2.0.x) download automatically.
3. Upload: → (or pio run -t upload), then monitor: 🔌 (or pio device monitor).
4. If upload does not start: hold BOOT, tap RST, release BOOT, upload again, then tap RST once after flashing.

The TFT_eSPI display configuration (Setup206, T-Display S3) is set in platformio.ini – no edits to the library needed.

Arduino IDE settings (if you keep using it)

Board ESP32S3 Dev Module, ESP32 core 2.0.x (not 3.x), USB CDC On Boot: Enabled, Flash Size: 16MB, PSRAM: OPI PSRAM, Partition: 16M Flash (3MB APP/9.9MB FATFS) or Huge APP. In Arduino/libraries/TFT_eSPI/User_Setup_Select.h comment out #include <User_Setup.h> and enable #include <User_Setups/Setup206_LilyGo_T_Display_S3.h>.

Configuration (config.yaml on SPIFFS)

All settings live in OpenWXStation/data/config.yaml: location (name, latitude, longitude), Open-Meteo API URL, units, pressure type, update/retry intervals, graph length, time zone (POSIX TZ with automatic DST), NTP server, display rotation/brightness/night dimming, and WiFi portal settings.

1. Edit OpenWXStation/data/config.yaml
2. PlatformIO → Platform → Upload Filesystem Image (pio run -t uploadfs) – only needed when the config changes
3. Restart the board. The serial log prints every loaded key ([CFG] ...).

If SPIFFS is empty or the file is missing, built-in defaults are used and the start screen says so. Partition table: partitions.csv (2 × 6.25 MB app, 3.4 MB SPIFFS, core dump).

Buttons

Button	Short press	Long press
BOOT (GPIO0, button 1)	Next page: weather → radiosonde → system info	3 s: open WiFi setup portal
KEY (GPIO14, button 2)	Refresh weather + radiosondes now	1 s: next brightness level

Hold BOOT while the board starts to erase the stored WiFi credentials. The info page shows WiFi/RSSI, IP, last update, errors, uptime, battery voltage, memory and config status.

Web configuration page (v1.2)

After WiFi is connected, open http://<ip>/ (the IP is shown for a few seconds after boot and on the info page) or http://openwx-station.local/.

• Live status (weather, WiFi, uptime, battery, memory)
• Place search (Open-Meteo geocoding, runs in your browser) → fills name, latitude, longitude
• All config.yaml settings as a form; Save settings writes config.yaml to SPIFFS and applies it immediately
• Advanced: edit the raw config.yaml; buttons for Refresh weather and Reboot
• Optional login: set web.password (HTTP basic auth, user web.user)

Initial setup: the WiFi setup portal (AP OpenWXS3, http://192.168.4.1) also asks for location name, latitude and longitude.

Radiosondes from up to 10 receivers (v1.4)

Receivers are configured in the web panel (System → Settings → Radiosonde receiver: Add / Edit / Test) or in config.yaml as sections rx1: … rx10: (enabled, source, host, port, name, user, password). A v1.3 config with a single sonde.host is migrated to rx1 automatically.

Receiver	Sondes (every poll)	Info + health (every 60 s)	Default port
OpenWXSDR	/api/sondes	/api/gateway, /api/status, /api/health	5000
OpenWXTTGO	/api/sondes	/live.json, /api/status, /api/health	80
OpenWXDeck	/api/status	/api/config, /api/health	80

All sondes are merged by serial (newest frame wins, "heard by" lists every receiver) and kept 24 h. The device page shows the newest sonde; active = younger than sonde.max_age_s, older ones are recently received. Unreachable receivers are retried every 60 s.

Web panel (v1.4)

• Menu → Weather: large weather view (icon, temperature, condition, local clock, min/max, humidity, pressure, wind, 24 h chart)
• Menu → Radiosonde: monitor in OpenWXDeck style – map (Leaflet/OSM, needs internet in the browser) with receivers, sondes and tracks; sidebar with System Statistics, Active Radiosondes, Recently Received, System Health, Receiver Information
• System → Settings (tiles: Now · Location · Weather / Radiosonde · Radiosonde receiver · Display / WiFi · Web access · Time / System), Refresh, config.yaml (editor + download), Reboot
• About

The page source is web/index.html. PlatformIO embeds it (gzip) into OpenWXStation/webpage.h before every build via tools/embed_web.py; with the Arduino IDE run python tools/embed_web.py after editing.

Note: Upload Filesystem Image replaces config.yaml on the device, including everything saved in the web panel. Use it for a fresh setup only; otherwise download the current file via System → config.yaml first.