Heltec Wireless Stick V3
Compact ESP32-S3 development board with integrated SX1262 LoRa transceiver and 0.49-inch OLED display. Supports Meshtastic, LoRaWAN, WiFi, and BLE 5.0 in a breadboard-friendly form factor with battery management.
$17.90
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Specifications
Components
Xtensa LX7 dual-core processor @ 240MHz with 512KB SRAM, 8MB in-package flash, WiFi 802.11 b/g/n, BLE 5.0, hardware crypto acceleration, and ULP co-processor for deep sleep operation.
Semtech SX1262 long-range LoRa radio supporting 150-960MHz ISM bands with +22dBm TX power, -134dBm RX sensitivity, LoRa and FSK modulation, and ultra-low power consumption.
Solomon Systech SSD1306 OLED display controller driving a 64x32 pixel monochrome display via I2C interface at address 0x3C.
Silicon Labs CP2102 single-chip USB 2.0 full-speed to UART bridge for programming and serial debugging.
Bus Interfaces
GPIO Map
Overview
The Heltec Wireless Stick V3 is a compact LoRa development board built around the ESP32-S3FN8 MCU and Semtech SX1262 LoRa transceiver. It packs WiFi, Bluetooth LE 5.0, and long-range LoRa radio into a slim 58mm x 23mm form factor with a built-in 0.49-inch OLED status display and integrated battery management.
Designed for both prototyping and deployment, the board supports Meshtastic mesh networking firmware out of the box and is compatible with LoRaWAN via Heltec's libraries. The dual-row 2.54mm pin headers expose a generous set of GPIOs including ADC, touch, SPI, I2C, and UART interfaces, making it well-suited for sensor nodes, environmental monitoring, and off-grid communication relays.
The V3 revision upgrades the MCU from ESP32 to the more capable ESP32-S3, bringing improved processing power, native USB support, and BLE 5.0. An onboard CP2102 USB-to-serial bridge handles programming and debugging via USB-C, while the SH1.25 battery connector with charge management enables portable and solar-powered deployments.
With strong community support across Arduino, PlatformIO, MicroPython, and Zephyr RTOS, the Wireless Stick V3 is a versatile platform for LoRa-based IoT projects ranging from agricultural monitoring to urban mesh networks.
Use Cases
7LoRa 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.
Off-Grid Communication
Text messaging and data exchange in areas without cellular or internet coverage.
LoRaWAN Sensor Node
Build a long-range, low-power sensor node that communicates over LoRaWAN networks like The Things Network or Helium.
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Field Data Logger
Battery-powered device for recording sensor data, GPS coordinates, and environmental measurements in the field.
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.
GPS Tracking
Location tracking and navigation using GNSS satellite receivers.
Resources
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