Heltec Turtle Board
Ultra-low-power LoRa development board with STM32L432KC ARM Cortex-M4 MCU and SX1276 transceiver, capable of 10-year battery life on AAA cells using the RadioShuttle peer-to-peer protocol.
$41.00
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Specifications
Certifications
Components
STMicroelectronics 32-bit ARM Cortex-M4 with FPU running at up to 80 MHz, featuring 256KB flash, 64KB SRAM, hardware AES-256 encryption, and 4 uA deep sleep current.
Semtech SX1276 LoRa transceiver supporting 137-1020 MHz with up to +20 dBm TX power, -148 dBm sensitivity, and LoRa/FSK/OOK modulation. Provides 200m to 20km range in ISM bands.
Bus Interfaces
GPIO Map
Overview
The Heltec Turtle Board is an ultra-low-power LoRa development board designed for long-life battery-powered IoT applications. Built around the STM32L432KC ARM Cortex-M4 MCU and Semtech SX1276 LoRa transceiver, it achieves a remarkable 4 uA sleep current that enables up to 10 years of operation on two standard AAA batteries.
What sets the Turtle Board apart from typical LoRa nodes is its included RadioShuttle peer-to-peer protocol software, which enables direct node-to-node communication without requiring LoRaWAN gateways or network servers. This makes it a turnkey solution for deploying wireless sensor networks in remote locations. The board also supports standard LoRaWAN protocol with AT command interface for integration into existing networks.
The board exposes 18 GPIO pins through two 14-pin headers, providing access to SPI, I2C, UART, ADC, and DAC interfaces for connecting external sensors and peripherals. An optional Si7021 temperature/humidity sensor can be plugged directly onto the debug header, and I2C-compatible OLED displays (SSD1306) are supported out of the box. The integrated MQTT gateway functionality allows the board to bridge LoRa sensor data directly to cloud platforms.
Programming is supported via ARM Mbed IDE and STM32CubeIDE, with firmware upload possible through DFU over USB or ST-LINK debugger. The board features automatic USB/battery power switching with ESD and short-circuit protection on the Micro-USB port.
Use Cases
5LoRa Sensor Node
A low-power wireless sensor node that transmits data over LoRa for remote monitoring applications like agriculture, environmental sensing, and industrial IoT.
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Battery-Powered Sensor
An ultra-low-power sensor device designed to operate on batteries for months or years, ideal for remote deployments where mains power is unavailable.
MQTT Gateway
A device that bridges LoRa or other wireless sensor networks to MQTT brokers, enabling cloud connectivity and integration with IoT platforms.
Asset Tracking
Tracking the location and status of physical assets like vehicles, packages, and equipment.
Resources
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