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Heltec

HELTEC-LORA32V4-884

New product

China

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Heltec WiFi LoRa 32 V4 ESP32-S3 SX1262 Meshtastic Meshcore development board

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The Heltec WiFi LoRa 32 V4 is a high-performance IoT development board combining an ESP32-S3 microcontroller and an SX1262 transceiver. Designed for long-range communication projects, it is ideal for deploying Meshtastic, MeshCore or LoRaWAN nodes with high energy efficiency.

  • Dual-core ESP32-S3R2 microcontroller with 16 MB of Flash memory and 2 MB of PSRAM
  • High-power Semtech SX1262 LoRa transceiver delivering up to 28 dBm
  • 0.96-inch (128x64) OLED display protected by a polycarbonate casing with an integrated 2.4 GHz FPC antenna
  • Comprehensive wireless connectivity: LoRa, Wi-Fi 802.11 b/g/n and Bluetooth 5 (LE / Mesh)
  • Advanced power management with direct connectors for LiPo/Li-Ion batteries and solar panels (SH1.25)
  • Ultra-low standby current consumption of less than 20 µA
  • Pinout and form factor compatible with the previous WiFi LoRa 32 V3 version

Supplied with: Heltec WiFi LoRa 32 V4 board, 1.25mm-pitch battery connector, male pin headers for soldering.

More details

29,70 € tax excl.

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Datasheet ESP32 espressif

1.03M

Data sheet

The Heltec WiFi LoRa 32 V4 board represents the new generation of IoT development nodes from Heltec Automation. Equipped with the powerful ESP32-S3 processor and the SX1262 radio chip, it offers exceptional range and comprehensive software integration for decentralised mesh networks (Meshtastic, MeshCore) as well as professional LoRaWAN infrastructures. It is aimed at makers, amateur radio enthusiasts and engineers looking for a compact, standalone and robust solution.

Key features

  • Enhanced transmission power: RF amplification delivering up to +28 dBm (depending on band) to maximise LoRa range in urban or rural environments.
  • Modern ESP32-S3 processor: Increased processing power with 2 MB of PSRAM to handle rich interfaces and complex routing protocols.
  • Protection and integrated antenna: A polycarbonate chassis that protects the 0.96" OLED display and directly integrates the 2.4 GHz FPC antenna for Wi-Fi and Bluetooth.
  • Solar power management: Dedicated SH1.25 ports for solar panel power supply (4.7–6V) and lithium battery with integrated charge management.
  • Backwards compatibility: Retains the compact form factor and pinout (gold-plated pins) of the popular V3 version.
  • Universal software support: Native support for Meshtastic (firmware v2.7.20+), Arduino IDE, PlatformIO, ESP-IDF and MicroPython.

Technical specifications

  • Microcontroller: Espressif ESP32-S3R2 (Dual-core 32-bit LX7)
  • LoRa chip: Semtech SX1262
  • Frequency bands: 863–928 MHz (high-power version) / 433–510 MHz
  • LoRa sensitivity: Up to -137 dBm
  • Maximum LoRa TX power: 28 ± 1 dBm (high-power version) / 22 dBm
  • Wireless connectivity: Wi-Fi 802.11 b/g/n (up to 150 Mbps), Bluetooth 5 LE & Mesh
  • Memory: 384 KB ROM, 512 KB SRAM, 16 KB RTC SRAM, 16 MB external Flash, 2 MB PSRAM
  • Display: 0.96" monochrome OLED screen (SSD1315, resolution 128x64 pixels)
  • RF connectors: 2x IPEX 1.0 (LoRa and external 2.4 GHz)
  • Interfaces: USB Type-C, SH1.25-2P (battery), SH1.25-2P (solar panel), SH1.25-8P (GNSS/GPS), 2x 18-pin 2.54mm
  • I/O resources: 7x ADC1, 2x ADC2, 7x Touch, 3x UART, 2x I2C, 2x I2S, 4x SPI
  • Standby current consumption: ~20 µA (battery-powered / 3.3V)
  • LoRa transmission power consumption: 290 mA (14 dBm) to 750 mA (27 dBm)
  • Power supply: USB-C 5V, lithium battery 3.3V–4.2V, solar panel 4.7V–6V
  • Dimensions: 51.7 x 25.4 x 10.7 mm
  • Operating temperature: -40 °C to +85 °C

Compatibility

  • Software and protocols: Meshtastic (official V4 firmware), MeshCore, LoRaWAN (regions EU868, US915, AS923, etc.), RadioLib
  • Development environments: Arduino IDE, PlatformIO, Espressif ESP-IDF, MicroPython
  • Power supplies: 3.7V single-cell LiPo / Li-Ion batteries with 2-pin SH1.25 connector, 5V / 6V solar panels
  • Accessories: GNSS / GPS modules via the 8-pin SH1.25 connector, LoRa antennas with IPEX 1 (U.FL) connector
  • Pinout: Backwards compatible with accessories and shields for the Heltec WiFi LoRa 32 V3

FAQ

How do I put the board into Bootloader mode to flash firmware (e.g. Meshtastic)?

To force Bootloader mode, connect the USB-C cable to your computer, hold down the PRG button, briefly press the RST button, then release the PRG button. You can then flash your firmware via Web Flasher or PlatformIO, and restart the board.

Can an external Wi-Fi/Bluetooth antenna be connected via IPEX?

By default, the board uses the 2.4 GHz FPC antenna integrated into the casing. To route the signal to the 2.4 GHz IPEX connector, a 0-ohm SMD resistor modification (or solder bridge) is provided on the PCB to switch to the external RF port.

What is the difference between the WiFi LoRa 32 V3 and the new V4?

The V4 version features a faster ESP32-S3 processor with 2 MB of PSRAM, a more powerful LoRa RF amplifier (up to +28 dBm), a screen protection frame with an integrated FPC antenna, as well as dedicated connectors for a solar panel and GPS module.

How are solar charging and the battery managed?

The board features a regulated charging circuit. You can connect a lithium battery (3.7V) and a solar panel (4.7 to 6V) simultaneously to their respective SH1.25 connectors for complete autonomy when used outdoors.

Does the board come with a LoRa antenna?

No, the board has an IPEX 1.0 (U.FL) connector for LoRa. It is essential to connect an antenna suitable for the frequency band before transmitting, to avoid damaging the RF amplifier stage.

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