STMicroelectronics and Mouser have launched two new products with LoRa connectivity: STM32 LoRaWAN Discovery Board with an STM32L072 ARM Cortex M0+ MCU and Semtech SX1276 transceiver, and I-NUCLEO-LRWAN1 STM32 LoRa expansion board for STM32 Nucleo boards with an STM32L052 MCU and Semtech SX1272 radio transceiver.
STM32 LoRaWAN Discovery Board
B-L072Z-LRWAN1 STM32L0 Discovery kit LoRa specifications:
- LoRa Module – Murata CMWX1ZZABZ-091 with
- MCU – STM32L072CZ ARM Cortex -M0+ MCU @ 32 MHz with 192 KB Flash memory, 20 KB RAM, 20 KB EEPROM
- SX1276 transceiver supporting LoRa, FSK, GFSK, MSK, GMSK and OOK modulations
- Antennas – SMA and U.FL RF interface connectors, 50 Ohm SMA RF antenna
- Debugging – On-board ST-LINK/V2-1 supporting USB re-enumeration capability
- Expansion – Arduino Uno V3 connectors
- Misc – 7x LEDs, 2x push-buttons (user and reset)
- Power supply – Via USB bus or external VIN/3.3 V supply voltage or batteries; 3xAAA-type-battery holder for standalone operation (on the back of the board?)
The board can be programmed with Keil MDK-ARM, IAR EWARM, GCC-based IDEs including SW4STM32 from AC6, and ARM mbed online. You’ll find hardware and software documentation on the product page.
I-NUCLEO-LRWAN1 STM32 LoRa Expansion Board for STM32 Nucleo Board
I-NUCLEO-LRWAN1 shield specifications:
- USI LPWAN module with:
- MCU – STMicro STM32L052T8Y6 ARM Cortex -M0+ MCU @ 32 MHz with 64 KB flash, 8 KB RAM, 2 KB EEPROM, T-RNG
- Semtech SX1272 radio transceiver supporting LoRa , FSK, GFSK, MSK, GMSK and OOK modulation
- Antenna – SMA connector with antenna included in the kit
- Sensors – ST LSM303AGR accelerometer and magnetometer sensor, ST HTS221 relative humidity and temperature sensor, and ST LPS22HB pressure sensor
- Expansion – Arduino UNO R3 headers
You can use control the shield through STM32 Nucleo board using I-CUBE-LRWAN LoRaWAN software expansion for STM32Cube. Visit the product page for more information about the expansion board.
Both boards are exclusively sold through Mouser with STM32 LoRaWAN Discovery Board going for $46.50, and I-NUCLEO-LRWAN1 for $31.25.
Jean-Luc started CNX Software in 2010 as a part-time endeavor, before quitting his job as a software engineering manager, and starting to write daily news, and reviews full time later in 2011.
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Hello, i would to know up how many meter or kilometer for 14dB and 20dB?
thanks you.
@haze
No one can give you a accurate number as it depends on the environment, your antennas etc.
You can usually get 5Km if you have line of sight at 14dBm, more if the one or both devices are at high altitude. It’s possible to manage 15Km+ under very strict conditions.
However in an urban, busy, environment without line of sight it can quickly drop to 200 meters… so it’s quite sensitive to path attenuation, interference, etc.
EU regulations limit transmissions in this 868Mhz band to 14dBm so I haven’t tested on 20dBm.
ok thanks you
@haze
Here’s a very useful tool for determining range:
http://en.jirous.com/calculation-wifi
So apparently it’s now possible to use Sigfox on STM32 LoRaWAN Discovery Board with just a software package:
http://www.st.com/content/st_com/en/about/media-center/press-item.html/n4004.html
I must have missed something…
@Jean-Luc Aufranc (CNXSoft)
It looks like Semtech SX1276 can be used with Sigfox too, or there’s something specific in the Murata module to add support for Sigfox.