RockBase IoT
NM-EPD-420 4.2 inch e-Paper ESP32-S3 Development Board WiFi Weather Station Dashboard AHT20 ES8311 Codec
NM-EPD-420 4.2 inch e-Paper ESP32-S3 Development Board WiFi Weather Station Dashboard AHT20 ES8311 Codec
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- Product Features
The NM-EPD-420 is a fully integrated 4.2 inch tri-color ( B/W/R) e-Paper ESP32-S3 development board, specially designed for desktop smart weather dashboard, LoRa Desktop Station. Integrates ESP32-S3, e-ink display, AHT20 temerature and humidity sensor, audio input & output, Lithium battery charging management and multi expansion interfaces into the PCB.
Newly SKU details:
The NM-EPD-420-BW: ( GYE042A87 black-and-white panel)
- Full refresh (black / white) takes approximately 2-3 seconds, with partial refresh supported in approximately 1 second.
- The black-and-white panel is recommended for applications that need faster content updates.
- HT-RA62 HF module (EU868 / 863–928 MHz)
- The NM-EPD-420-BW version is suitable for fast-refresh applications and includes LoRa support by default, making it suitable for indoor desktop LoRa nodes.
The NM-EPD-420-4C: ( GDEY0420F51 B/W/R/Y 4-color panel)
- Full refresh (black / white / red / yellow) takes approximately 25-30 seconds; partial refresh is not supported.
- The four-color panel is recommended for applications that need more colors and do not require frequent updates.
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Build environment:
nm-epd-420-4c; driver:GxEPD2_420c_GDEY0420F51(400×300, black / white / red / yellow). - Support colorful display ( inkstone-display).
E-Paper only sonsumes power when refreshing screen, keeps static content displayed without power supply, so the board can work for few weeks or few months with a single 3.7V Lithum battery.
The ESP32-Dashboard support weather, timeline, world clock, focus clock, agent and News.
Key Features
| Features | Details |
| 💬 ESP32-S3R8 | 240MHz Xtensa LX7, 16MB Flash + 8MB PSRAM |
| ⚙️ WiFI 2.4G & BLE 5 | Any event can trigger the Agent Loop and more Response can be as fast as milliseconds |
| 🧬 4.2-inch E-Paper | Tri-color ( Black / White / Red) |
| 📤 AHT20 | temperature & humidity sensor |
| 🧰 ES8311 +DMIC | QAudio codec + Microphone + 3W 4Ω Speaker |
| 🧩 Complete expansion peripherals | TF SD Card, USB-C port, Lithium battery Charging, USER keys, Battery Key |
|
🛠️ LoRa Module (optional)
|
HT-RA62 LoRa module ( SX1262 module)
|
Hardware Specifications
| COMPONENT | SPECIFICATION |
| Main SoC | ESP32-S3R8 ( Xtensa LX7 32-bit, 240MHz ) |
| Wireless Protocols | Wi-Fi 2.4GHz + BLE 5 |
| Memory | 16MB FLash + 8MB PSRAM |
| Interface | USB-C, TF Slot, Battery Interface |
| Operation Temp | -20℃ to 70℃ |
| Certifications | FCC, CE |
NM-EPD-420 Board
The Board with LoRa module ( HT-RA62 ):
Package List
The NM-EPD-420 with 3-color B/W/R without LoRa module and antenna.
Only the NM-EPD-420-BW with LoRa and the 10 dBi Soft Antenna. (EU868 / 863–928 MHz)
Applications
The NM-EPD-420-BW with B/W e-paper, default with LoRa: HT-RA62 module (HF, EU868 / 863–928 MHz) and 10 dBi Soft Antenna.
