Heltec WiFi LoRa 32 V4 ESP32-S3 Board | 863-928MHz Meshtastic Node
Heltec WiFi LoRa 32 V4 ESP32-S3 Board | 863-928MHz Meshtastic Node
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Short Product Description
Short Product Description
The Heltec WiFi LoRa 32 V4 (High-Frequency 863-928MHz) is a next-generation IoT development board engineered for long-range, off-grid communication. Upgraded with a powerful ESP32-S3R2 MCU, an SX1262 LoRa chip delivering 28dBm max TX power, and native solar power inputs, it is the ultimate foundation for building robust Meshtastic mesh networks. Available with or without a GNSS/GPS module, this V4.3 board is in-stock at Sun Cheong Computer Co. Ltd. (新昌電腦有限公司) in Sham Shui Po, offering local makers and STEM educators instant access to enterprise-grade IoT hardware.
Key Features
Key Features
- Massive 28dBm TX Power: Upgraded SX1262 LoRa chip delivers significantly longer communication distances (25~30km) compared to the previous V3 board.
- Dual Power Inputs: Features dedicated SH1.25-2P interfaces for both a 3.3-4.4V lithium battery and a 4.7-6V solar panel for autonomous deployment.
- ESP32-S3R2 MCU: High-performance Xtensa 32-bit LX7 dual-core processor with 16MB Flash and 2MB PSRAM handles complex mesh routing effortlessly.
- Optional GNSS/GPS: Available in two configurations (with or without GPS) via the onboard SH1.25-8P interface for precise location tracking.
- Integrated 0.96" OLED: Provides instant visual feedback for node status, battery levels, and incoming messages, protected by a custom plastic bracket.
Full Product Description
Full Product Description
Next-Gen Off-Grid Communication Powerhouse
The Heltec V4 board achieves unprecedented communication distances of 25 to 30km by utilizing the advanced SX1262 LoRa chip paired with a massive 28dBm maximum transmission power. This high-frequency (863-928MHz) version is specifically tuned for regions utilizing the 915MHz ISM band, ensuring optimal signal penetration through dense urban environments and rugged outdoor terrains. Whether you are building a decentralized text-messaging network for hiking or deploying remote agricultural sensors, this board provides the reliable, long-range backbone your project demands.
Built for Solar-Powered Meshtastic Nodes
This V4 iteration completely overhauls power management by introducing a dedicated 1.25-2P solar input interface (4.7-6V) alongside the standard lithium battery port. This allows developers to deploy truly autonomous, self-sustaining Meshtastic nodes on rooftops or mountain peaks without worrying about frequent battery replacements. Combined with the energy-efficient ESP32-S3FN8 dual-core processor and a crisp 0.96-inch OLED display, it offers a complete, out-of-the-box hardware solution for off-grid mesh networking.
Pro Tip from Our Technicians
Always ensure you are using Meshtastic firmware version 2.7.20 or above for this V4.3 hardware, and strictly avoid selecting the "Meshtastic UI" option during flashing. Our Sham Shui Po technical team frequently sees customers with blank OLED screens because the "Meshtastic UI" setting is designed exclusively for touchscreen models, not the standard 0.96-inch OLED included on this board.
Technical Specifications
Technical Specifications
- MCU: ESP32-S3R2 (Xtensa 32-bit LX7 dual-core processor)
- LoRa Chip: SX1262
- Frequency Band: High-power version: 863-928MHz
- Max TX Power: 28 ±1 dBm
- Max Receiving Sensitivity: -137dBm @ SF12 BW=125KHz
- Wireless Connectivity: Wi-Fi (802.11 b/g/n), Bluetooth LE, Bluetooth 5, Bluetooth Mesh
- Memory: 16MB Flash, 2MB PSRAM, 512KB SRAM, 384KB ROM
- Power Interfaces: Type-C USB, 1.25-2P Lithium Battery (3.3-4.4V), 1.25-2P Solar (4.7-6V)
- Antenna Interfaces: LoRa ANT (IPEX1.0), 2.4G ANT (IPEX1.0)
- Dimensions: 51.7mm x 25.4mm x 10.7mm
Delivery Options
Delivery Options
- Local delivery within Hong Kong and in-store pickup.
- Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
- Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
- Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
- In-store pickup details (location and time) will be confirmed by email or phone message.
- Delivery times are estimates and may be affected by weather or unforeseen circumstances.
FAQ Section
FAQ Section
- Does this development board include a battery and a GPS module?No, a lithium battery is not included due to shipping regulations, and the GPS module is an optional add-on that you must specifically select during purchase.
- What is the main difference between the Heltec V3 and this new V4 board?The V4 board upgrades the LoRa TX power from 21dBm to 28dBm for much longer range, adds a dedicated solar power input, and upgrades the MCU to the ESP32-S3R2 with 16MB of external flash.
- How do I force the board into Bootloader mode if firmware flashing fails?You can enter Bootloader mode by connecting the USB-C cable, holding down the "PRG" button, pressing the "RST" button once, and then releasing the "PRG" button before flashing.
- Is the 863-928MHz frequency version legal to use in Hong Kong?Yes, the 915MHz frequency falls within the standard ISM (Industrial, Scientific, and Medical) band, which is widely used and legally permitted for low-power LoRa applications in Hong Kong.
- Why is my OLED screen completely blank after installing Meshtastic?Your screen is blank because you likely selected the "Meshtastic UI" firmware option, which is only for touchscreens; you must re-flash the standard firmware for the 0.96-inch OLED to work.
Target Users / Applications
Target Users / Applications
- Off-grid hikers and trail runners in Sai Kung building decentralized Meshtastic communication networks.
- IoT developers creating solar-powered, long-range environmental monitoring stations for agriculture.
- STEM educators teaching advanced mesh networking and ESP32 programming in university labs.
