🧩 Vision Master E290 (HT-VME290) is a powerful and compact E-Ink development board designed for low-power IoT applications. It supports multiple wireless protocols including Bluetooth, Wi-Fi, and LoRa, enabling flexible remote display control.
📺 Equipped with a default 2.90-inch black-and-white E-Ink display, the board can retain content for up to 180 days after power loss. It is fully Arduino-compatible and supports PlatformIO, MicroPython, and open-source projects like Meshtastic, making it ideal for smart signage, electronic tags, and identity systems.
🔧 Main Features
- 🧠 ESP32-S3R8 MCU with integrated Wi-Fi and BLE
- 📡 Optional LoRa module, compatible with Meshtastic mesh networks
- 🔋 Ultra-low power: 18μA in deep sleep, 180-day display retention
- 🔌 SH1.25-2 battery interface with lithium battery management (charging, protection, auto-switching)
- 📺 2.90" E-Ink display (296×128 pixels), supports partial refresh
- 🌡️ Storage conditions: –25 ~ 70℃, ≤45% RH
- 🌤️ Optimal operating range: 0 ~ 50℃, 55±10% RH
- 🧪 SH2.0-4P sensor interface, compatible with QuickLink sensors
- 🧱 2×20 Pin Female Header, fully compatible with Raspberry Pi
- 💻 Arduino-ready with development frameworks and libraries
📊 Specifications
| 📌 Parameters | 📋 Description |
|---|---|
| 🧠 Master Chip | ESP32-S3R8 |
| 📡 LoRa Node Chip | SX1262 (optional) |
| 📶 Frequency | 470–510 MHz / 863–928 MHz |
| 📤 Max TX Power | 21 ± 1 dBm |
| 📥 Receiving Sensitivity | –136 dBm @ SF12 BW=125 kHz |
| 🌐 Wi-Fi | 802.11 b/g/n, up to 150 Mbps |
| 🔗 Bluetooth | Bluetooth 5 (LE) |
| ⚙️ Hardware Resources | 6×ADC_1, 1×ADC_2, 6×Touch, 8 MB PSRAM, 3×UART, 2×I2C, 2×SPI |
| 💾 Memory | 384 KB ROM, 512 KB SRAM, 16 KB RTC SRAM, 16 MB Flash |
| 🔌 Interfaces | Type-C USB, 2×1.25 battery ports, LoRa/Wi-Fi ANT (IPEX1.0), SH2.0-4P sensor |
| 🔋 Battery | 3.7 V lithium battery (power + charging) |
| 🌡️ Operating Temp | –20 ~ 70 °C |
| 🖥️ E-Ink Display | 2.90", 128×296 pixels, 29×67 mm |
| 🎨 Display Color | Black & White (2 grayscale) |
| 📐 Dimensions | 87.96 × 36.63 × 12 mm |
💡 Highlights
📚 Docs & Resources
- 📦 [Framework] — Heltec ESP (ESP32 & ESP8266) Framework (includes LoRaWAN library)
- 🧰 [Library] — Heltec ESP32 Special Library
- 📐 [Schematic] — HT-VME290 Circuit Diagram (PDF)
- 📄 [Datasheet] — HT-VME290 Product Datasheet
- 🖥️ [E-Ink Panel] — DEPG0290BNS800F6 E-Ink Display Datasheet
- 📘 [User Manual] — HT-VME290 Documentation Portal
- 📥 [Downloads] — All HT-VME290 Resources
📦 Package Contents
The standard package (without optional accessories) includes the following items:
| Item | Quantity |
|---|---|
| 🧩 HT-VME290 Main Board | x1 |
| 📡 LoRa Antenna (included if LoRa option selected) | x1 |
| 🔋 SH1.25-2P Battery Connector | x1 |
| 🧱 2.54mm × 13 Pin Header | x2 |