Heltec LoRa Kit 151
Ultra-low-power LoRaWAN development kit based on STM32L151CBU6 ARM Cortex-M3 MCU and Semtech SX1278 LoRa transceiver, with 6uA deep sleep current, integrated battery management, and CE certification.
$13.50
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Specifications
Certifications
Components
STMicroelectronics STM32L151CBU6 ultra-low-power 32-bit ARM Cortex-M3 MCU running at up to 32MHz with 128KB flash, 16KB SRAM, 4KB EEPROM, 12-bit ADC/DAC, and deep sleep current as low as 6uA.
Semtech SX1278 LoRa transceiver supporting 137-525MHz with LoRa modulation, -135dBm sensitivity at SF12/125kHz, and +19dBm maximum TX power for long-range LPWAN communication.
Silicon Labs CP2102 single-chip USB to UART bridge IC providing USB 2.0 full-speed connectivity for programming and serial debug output.
TP4054 single-cell lithium-ion/polymer battery charger with programmable charge current, providing integrated battery management with USB/battery automatic power switching.
Bus Interfaces
GPIO Map
Overview
The Heltec LoRa Kit 151 is an ultra-low-power LoRaWAN development board designed for battery-powered IoT sensor node applications. Built around the STM32L151CBU6 ARM Cortex-M3 microcontroller and Semtech SX1278 LoRa transceiver, it achieves a remarkably low deep sleep current of just 6uA, making it ideal for remote field deployments where devices must operate for months or years on a single battery charge.
The board comes in two frequency variants: the LoRa-Kit-151-L for 433-510MHz (EU433/CN470 bands) and the LoRa-Kit-151-F for 863-928MHz (EU868, US915, AU915, AS923, KR920 bands). Both variants support standard LoRaWAN 1.0.2 protocol with Class A, B, and C operation modes, and include AT command firmware for rapid prototyping without custom coding.
With 23 exposed GPIO pins including 8 ADC channels, 2 DAC outputs, 3 UART ports, 2 SPI buses, and 2 I2C buses, the LoRa Kit 151 provides ample interfacing options for connecting environmental sensors, actuators, and other peripherals. The onboard battery management system with TP4054 charger IC, SH1.25 battery connector, and automatic USB/battery power switching makes it ready for portable and field-deployed applications right out of the box.
The compact 56.3 x 25.5mm form factor with standard 2.54mm pin headers and breadboard-compatible layout makes it easy to integrate into custom PCB designs or prototype on a breadboard. An integrated CP2102 USB-to-serial bridge simplifies programming and debugging via the Micro-USB port.
Use Cases
5LoRaWAN Node
A LoRaWAN end device that transmits sensor data to a LoRaWAN gateway for long-range, low-power IoT applications.
Environmental Monitoring
Monitoring environmental conditions like temperature, humidity, air quality, and weather data using remote sensors.
Irrigation Control
Controlling irrigation systems based on real-time soil moisture sensor data to conserve water and maintain optimal plant health.
Smart Agriculture
Enables precision farming through remote sensor monitoring of soil, weather, and crop conditions over LoRaWAN networks.
Asset Tracking
Tracking the location and status of physical assets like vehicles, packages, and equipment.
Resources
Where to Buy
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