Heltec Wireless Bridge
ESP32 + SX1276 LoRa multi-protocol bridge in an aluminum enclosure, converting between WiFi, Bluetooth, and LoRa with 8MB flash and 8MB PSRAM.
$28.90
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Specifications
Certifications
Components
Xtensa LX6 dual-core MCU running at 240MHz with integrated WiFi 802.11 b/g/n and Bluetooth 4.2 BR/EDR + BLE, 520KB SRAM, hardware crypto acceleration.
Semtech LoRa transceiver covering 137-1020MHz with +18dBm TX power and -135dBm RX sensitivity, supporting LoRa and FSK modulation for long-range communication.
Silicon Labs single-chip USB-to-UART bridge providing programming and serial debug interface via Micro-USB port.
Espressif 64Mbit (8MB) SPI PSRAM chip providing external memory for data buffering and protocol translation workloads.
Standalone linear Li-Ion battery charger IC providing constant-current/constant-voltage charging for the internal LiPo battery via the 1.25mm JST connector.
Alpha & Omega Semiconductor P-channel MOSFET used for power path switching between USB and battery sources.
Bus Interfaces
GPIO Map
Overview
The Heltec Wireless Bridge is a compact multi-protocol communication device built around the ESP32-D0WDQ6 dual-core MCU and Semtech SX1276 LoRa transceiver. Housed in a high-strength aluminum alloy enclosure measuring just 66 x 30 x 15mm, it is designed to bridge between WiFi, Bluetooth, and LoRa radio protocols — enabling scenarios where data from one wireless domain needs to reach another.
The board features 8MB SPI flash and 8MB PSRAM (ESP-PSRAM64H), giving it ample memory for buffering and processing protocol translations. Two external SMA antenna connectors — one for LoRa (sub-GHz) and one for 2.4GHz WiFi/Bluetooth — provide strong RF performance. The SX1276 supports frequency bands from 433MHz to 928MHz with up to +18dBm transmit power and -135dBm receiver sensitivity, making it suitable for long-range LoRa deployments.
Power is supplied via Micro-USB through the integrated CP2102 USB-to-UART bridge, which also serves as the programming interface. An internal 1.25mm JST lithium battery connector with TP4054 charge management allows portable battery-powered operation, though accessing the battery connector requires opening the enclosure. The device includes CE certification, ESD protection, short-circuit protection, and RF shielding for reliable field deployment.
The Wireless Bridge is supported in the Heltec Arduino development framework with a dedicated board definition, and Heltec provides a pre-built Meshtastic firmware binary. WiFi and Bluetooth can operate simultaneously, making it well-suited for protocol bridging, mesh networking, and IoT gateway applications.
Use Cases
6LoRa-WiFi Bridge
Converts between LoRa and WiFi protocols, enabling remote LoRa nodes to reach the internet through a WiFi uplink.
LoRa-BLE Bridge
Bridges Bluetooth Low Energy and LoRa protocols, allowing BLE devices to communicate over long-range LoRa links.
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.
Meshtastic Mesh
Off-grid mesh communication using Meshtastic firmware over LoRa radio.
LoRaWAN Node
A LoRaWAN end device that transmits sensor data to a LoRaWAN gateway for long-range, low-power IoT applications.
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.
Resources
Where to Buy
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