ESP32-Weather-EPD Weather Station

ESP32-Weather-EPD is the classic low-power e-paper weather display: the ESP32 wakes on a schedule, fetches weather data from the OpenWeatherMap API, reads indoor temperature and humidity from an onboard sensor, then returns to deep sleep. The RockBase fork is adapted for the NM-EPD-420.

• Firmware repository: RockBase-iot/esp32-weather-epd
• Data API: OpenWeatherMap (bring your own free API key)

Dual Panel Support

Panel	Resolution	Notes
7.5" classic	800×480	High resolution, information-dense
4.2" tri-color	400×300	Significantly lower cost; a re-optimized UI keeps the same rich weather information and a similar visual experience

Power & Battery Life

• Sleep current around 14 µA
• Around 83 mA during refresh (~15 s on 7.5", ~10 s on 4.2" tri-color)
• 6–12 months on a 5000 mAh battery with a 30-minute update interval
• USB-C charging with battery monitoring

Display & Customization

• Hourly outlook graph: temperature line + precipitation probability (optionally volume) shaded bars
• Multiple languages, units, time/date formats, and AQI scales
• Extensive personalization options

Reference Hardware

Component	Recommended	Notes
ESP32	FireBeetle 2 ESP32-E	Low-power design, USB-C, battery management
E-paper display	See Panel Support in the repo	7.5" or 4.2" tri-color
Adapter board	DESPI-C02	Waveshare HATs (rev 2.2/2.3) not recommended
Sensor	BME280	Temperature, humidity, pressure; 3.3V/5V compatible
Battery	3.7V LiPo (JST-PH2.0)	5000 mAh for 6+ months runtime

Solder-Free Option

Using the NM-EPD-420 dev board eliminates the adapter board and soldering: it integrates a 4.2" tri-color/BW e-ink panel, AHT20 sensor, battery management, and USB-C. The repo includes the adapted branch and real-device demo photos.

Troubleshooting

The repository README includes a full error-message troubleshooting chapter (low battery, WiFi connection, API errors, time-server errors) — check it first when the display misbehaves.