Heltec WiFi LoRa 32 V4
ESP32-S3 based LoRa development board with built-in 0.96" OLED display, SX1262 LoRa transceiver, WiFi, BLE 5.0, USB-C, and LiPo battery charging. One of the most popular boards for Meshtastic.
$30.99
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Specifications
Components
Dual-core Xtensa LX7 microcontroller at 240 MHz with WiFi and BLE 5.0
Semtech LoRa transceiver, 433/868/915 MHz, +21 dBm TX power
0.96" 128x64 monochrome OLED display controller
USB-to-UART bridge for serial programming
Bus Interfaces
Overview
The Heltec WiFi LoRa 32 V4 is a compact development board built around the ESP32-S3 microcontroller and Semtech SX1262 LoRa transceiver. It features an integrated 0.96-inch OLED display, WiFi, Bluetooth 5.0 LE, USB-C connectivity, and a built-in LiPo battery charging circuit.
This board is one of the most widely used platforms for Meshtastic, an open-source mesh networking firmware for off-grid communication. It also supports Arduino, ESP-IDF, MicroPython, and LoRaWAN applications.
Key Features
- ESP32-S3 dual-core Xtensa LX7 processor at up to 240 MHz
- SX1262 LoRa transceiver supporting 433/868/915 MHz bands
- 0.96" OLED display (128x64, SSD1306) for status and debugging
- WiFi 802.11 b/g/n with onboard spring antenna
- Bluetooth 5.0 LE for configuration and data transfer
- USB-C for programming and power
- LiPo battery charging via SH1.25-2 connector
- IPEX/U.FL connector for external LoRa antenna
Specifications
| Spec | Value |
|---|---|
| MCU | ESP32-S3FN8 (dual-core LX7, 240 MHz) |
| Flash | 8 MB |
| SRAM | 512 KB |
| LoRa | SX1262, up to +21 dBm TX, -134 dBm RX sensitivity |
| Display | 0.96" 128x64 OLED (SSD1306) |
| USB | Type-C (CP2102 serial) |
| Battery | 3.7V LiPo via SH1.25-2 connector |
| Dimensions | 50.2 x 25.5 x 10.2 mm |
| Weight | 35g |
Meshtastic
This board is fully supported by Meshtastic firmware out of the box. Flash it via the Meshtastic web flasher or CLI, connect a LoRa antenna, and you have an off-grid mesh communication node.
Use Cases
5LoRa Mesh Networking
Building off-grid mesh communication networks using LoRa radio for text messaging, location sharing, and sensor data relay without cellular or internet infrastructure.
Meshtastic
Running Meshtastic firmware for off-grid LoRa mesh text communication, location sharing, and sensor telemetry without internet or cellular infrastructure.
IoT Gateway
Acting as a local IoT gateway that aggregates data from sensors, runs MQTT broker, Node-RED, or Home Assistant, and bridges to the cloud.
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Off-Grid Communication
Text messaging and data exchange in areas without cellular or internet coverage.
Where to Buy
Explore more of the directory — popular use cases, firmware, and specs to browse next.
