WiFi LoRa 32 (V4)
Upgraded ESP32-S3R2 + SX1262 LoRa dev board with 2MB PSRAM, 16MB flash, 0.96" OLED, switchable FPC/IPEX 2.4G antenna, GNSS interface, and solar input. Meshtastic and LoRaWAN ready.
$17.90
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Specifications
Components
Xtensa LX7 dual-core at 240MHz with 512KB SRAM, 2MB integrated PSRAM, WiFi 802.11 b/g/n, BLE 5.0, 45 GPIOs, hardware AES/SHA/RSA crypto, and AI vector instructions.
Semtech SX1262 LoRa transceiver supporting 433/470/868/915MHz bands. Standard version: +21dBm TX; high-power variant: +28dBm TX, -137dBm RX sensitivity at SF12 BW=125kHz.
Solomon Systech SSD1306 driving the onboard 0.96-inch monochrome OLED display at 128×64 resolution via I2C.
Silicon Labs CP2102 USB-to-UART bridge enabling serial programming and debug output over USB-C.
GPIO Map
Overview
The WiFi LoRa 32 (V4) is Heltec's enhanced successor to the V3, upgrading the MCU to the ESP32-S3R2 which adds 2MB integrated PSRAM alongside 16MB of external flash — a significant step up for applications requiring larger buffers, bitmap rendering, or lightweight TLS/TLS stacks. The board retains the familiar 0.96-inch OLED display, SX1262 LoRa transceiver, and USB-C interface in a nearly identical 51.7 × 25.4mm footprint.
A major addition in V4 is the switchable 2.4GHz antenna system: a built-in FPC antenna for compact installations and an IPEX connector for external antennas when range or enclosure mounting demands it. The board also adds a 1.25×8P GNSS header for direct connection to a GPS/GNSS module (such as the companion L76K), and a 1.25×2P solar input accepting 4.7–6V for off-grid deployments. A high-power LoRa variant is available offering up to 28dBm TX power.
The V4 is fully compatible with Meshtastic, MeshCore, and LoRaWAN, and supports Arduino, MicroPython, PlatformIO, and ESP-IDF. Deep sleep power consumption drops below 20µA, making it well suited for battery- or solar-powered sensor nodes and mesh relay nodes.
Use Cases
6Meshtastic Mesh
Off-grid mesh communication using Meshtastic firmware over LoRa radio.
LoRa 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.
LoRa IoT
IoT applications using LoRa radio for long-range, low-power sensor connectivity.
Smart Agriculture
Enables precision farming through remote sensor monitoring of soil, weather, and crop conditions over LoRaWAN networks.
Weather Station
A device that displays current weather conditions and forecasts, typically using WiFi to fetch data from weather APIs.
Compact IoT Node
Ultra-small microcontroller boards for embedding into tight spaces in IoT projects, props, cosplay, and miniature builds.
Resources
Where to Buy
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