Description
In order to meet the user’s requirements for Ultra-Low-Power and standard LoRaWAN protocol, we designed this product. On the basis of STM32L151CBU6MCU and SX1278 LoRa chip(433、470MHz), the low power current can reach to 6uA.
Overview
- CE Certificate;
- Microprocessor: STM32L151CCU6(ARM® Cortex®-M3 32-bit RISC core,support DFU mode) , with LoRa® node chip SX1276/SX1278;
- Onboard user resources available: 256 Kbytes of Flash memory with ECC; 32 Kbytes of RAM; 8 Kbytes of true EEPROM with ECC; 128-byte backup register.
- Micro USB interface with a complete voltage regulator, ESD protection, short circuit protection, and other protection measures;
- 1/2 AA battery shell, use 1/2 AA Lithium chlorine sulfite battery (this battery can’t charge, but onboard USB / battery power automatic switching allows connect USB when the battery is assembled);
- Reserve SMA antenna interface for LoRa use
- Download the firmware via DFU or ST-LINK;
- Provide complete LoRaWAN(ClassA/C) source code(support ABP and OTAA);
- With good RF circuit design and basic low-power design (sleep current: 1.8uA), it is convenient for IoT application vendors to quickly verify solutions and deploy applications;
Technical parameters:
Resource | Parameter | ||
Master Chip | STM32L151CCU6(Ultra-low-power 32-bit MCU ARM®-based Cortex®-M3) | ||
Wireless Communication | LoRa | ||
Node-to-node communication or LoRaWAN | |||
LoRa Chip | SX1276/SX1278 | ||
LoRaWAN Area | hardware version | Support frequency | |
LF | EU433 | ||
CN470 | |||
HF | IN865 | ||
EU868 | |||
US915 | |||
AU915 | |||
KR920 | |||
AS923 | |||
LoRa Maximum Output Power | 19dB ± 1dB | ||
Hardware Resource | UART x 3; SPI x 2; I2C x 2; I2S x 2; 12-bits ADC input x 14; 12-bits DAC output x 2; GPIO x 29 | ||
FLASH | 256KB internal FLASH | ||
RAM | 32KB internal SRAM | ||
Interface | Micro USB x 1; LoRa Antenna interface(SMA) x 1; 16 x 2.54 pin x 2 + 2 x 2.54 pin x 2 | ||
Maximum Size (Including protruding parts such as switch and battery compartment) |
56.6 x 24 x 20 mm | ||
USB to Serial Chip | x | ||
Battery | 1/2AA Lithium | ||
Solar Energy | x | ||
Battery Detection Circuit | √ | ||
External Device Power Control(Vext) | √ | ||
Low Power | Deep Sleep 2.5μA | ||
Display Size | No display | ||
Working Temperature | -40~80℃ |
Electrical Features | Condition | Minimum | Typica | Maximum |
Power Supply | USB powered(≥500mA) | 4.7V | 5V | 6V |
Lithium powered(≥250mA) | 3.3V | 3.6V | 4.2V | |
3.3V(pin)powered(≥150mA) | 2.7V | 3.3V | 3.5V | |
5V(pin)powered(≥500mA) | 4.7V | 5V | 6V | |
Power Consumption(mA) | LoRa 10dB output | 50mA | ||
LoRa 12dB output | 60mA | |||
LoRa 15dB output | 110mA | |||
LoRa 20dB output | 130mA | |||
Output | 3.3V pin output | 500mA | ||
5V pin output (USB powered only) | Equal to the input current | |||
External device power control (Vext 3.3V) | 350mA |
Docs&Resource
- LoRa Kit 151 Example Code
- All the examples shown here is built by Keil MDK V5.26
- LoRaWAN example is restricted technical data, it will become downloadable after purchase, you can find it on your account page (Didn’t buy this product from our website or from a reseller? You can contact your provider or Email us):
- LoRa Kit 151 Pingpang test example code (need two LoRa Kit 151 to test): https://heltec.org/wp-content/uploads/2019/07/Kit_151_PingPang.zip
- LoRa Kit 151 Schematic diagram
- https://resource.heltec.cn/download/LoRa_Kit_151/LoRa_Kit_151_sch_diagram.PDF
- Heltec LoRa Node Products Difference Table (Product Selection Table)
- https://docs.heltec.cn/#/en/products/lora/lora_node/heltec_lora_node_list_eu
- Summary of Common Problems
- http://www.heltec.cn/summary-of-common-problems-in-wifi-kit-series-continuous-update/?lang=en
- More Technical Data
- The more technical information will be sent to you by mail after purchase.
- No email received after buying? Please contact us via this email: support@heltec.cn
Test Info
LoRa 868-915MHz RF power output
LoRa 868MHz RF power output
LoRa 470MHz RF power output
LoRa 433MHz RF power output
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