LoRa Discovery Kit

[Tesla DeLorean]

Posted on April 05, 2017 at 22:40

LoRa Discovery Kit

STM32L072 and LoRa Discovery Kit featuring Open LoRa module by Murata using STM32L072CZY6TR MCU

http://www.st.com/en/evaluation-tools/b-l072z-lrwan1.html

Features

• Ultra-low-power STM32L0 Series MCUhttp://www.mouser.com/stm32l0, Cortex® -M0+ based with 192Kbytes of Flash memory, 20Kbytes of RAM, 6Kbytes of EEPROM, LCD, crystal-less USB, T-RNG, PCROP
• 157dB maximum link budget
• +20dBm, 100mW constant RF output versus Vsupply
• +14dBm high efficiency PA
• Programmable bit rate up to 300kbps
• High sensitivity: down to -137dBm
• Bullet-proof front end: IIP3 = -12.5dBm
• 89dB blocking immunity
• Low RX current of 10mA, 200nA register retention
• Fully integrated synthesizer with a resolution of 61Hz
• FSK, GFSK, MSK, GMSK, LoRa™ and OOK modulations
• Built-in bit synchronizer for clock recovery
• Sync word recognition
• Preamble detection
• 127dB+ dynamic range RSSI
• Built-in temperature sensor and low battery indicator 1.65V to 3.6V power supply

The AT_Slave example (creates AT modem via ST-LINK VCP) is about 41KB in size

• Attached is original shipping firmware (April 2017) Ping-Pong Demo
• Added LoraDisco_ATSlave_US915.hex a build of the example from the Cube Extensions, USA 915 MHz option selected
• Added LoraDisco_ATSlave_US915_V111.hex a build from the V1.1.1 tree
• Added LoraDisco_ATSlave_US915HYBRID_V111.hex
• a build from the V1.1.1 tree w/US915_HYBRID (17-Aug-2017)
• Added LoraDisco_ATSlave_US915HYBRID_FULL_NOT_TINY_V111.hex.zip a build using Keil native sscanf/printf w/AT+SEND fixed

[Tesla DeLorean]

Posted on September 11, 2017 at 03:21

>>Are you suggesting that all antennas should be mounted above the roof ?

In my situation the height would significantly improve my coverage area. I didn't want to get up there, or run cables.

Generally people don't want to make holes in the roof, but if you have A/C units and conduit already in place, it would certainly allow opportunities to get LoS.

I suspect jamming or contention could become an issue, the band here is quite wide, and time synchronized frequency/channel hopping (deployment specific LFSR and seed) could be implemented.

CAN has a relatively small payload, so time on-air would be quite low.

I found the NUCLEO and SX1272 bought separately netted out cheaper. These mix and match well with the DISCO implementation.

[T J]

Posted on September 11, 2017 at 04:40

I checked those boards,

The SX1276 has a much wider frequency range. 130 - 1020MHz over the SX1272 860 - 1020MHz

that new ST Kit B-L072Z-LRWAN1 has this new SX1276. its seems to be the better long term solution.

the chip itself, CMWX1ZZABZ-078 is under $20

at 37.5kbps, its double what I am using on CanBus.

nice to see the frequency synthesizer has a resolution of 61Hz.

I would use the chip on the slaves. not sure about the terminal, already a little crowded,

I may opt for USB to the ST kit B-L072Z-LRWAN1.

[Tesla DeLorean]

Posted on September 12, 2017 at 22:25

LRWAN successfully ported to assorted STM32F4 boards using the SX1272 shield

NUCLEO-F401RE (64)

NUCLEO-F429ZI (144)

NUCLEO-F446ZE (144)

MDOT-915 (Multi-tech F411RET6 based SX1272 design)

https://www.digikey.com/en/product-highlight/m/multi-tech-systems/mdot-series-modules

[Tesla DeLorean]

Posted on September 15, 2017 at 22:28

STM32F412G-DISCOVERY

[Tesla DeLorean]

Posted on September 28, 2017 at 21:25

With a roof mounted beacon, I was able to demonstrate street level LoS to 2.5 km (1.5 miles) with the least aggressive coding/spreading settings, using the Discovery boards, and 5 dBi antennas.

[Former Member]

Posted on October 03, 2017 at 05:05

Hi Clive

I don't know how to connect to the ST kit B-L072Z-LRWAN1 through USB to my PC. In attached image, i connect to my PC and don'tload usb driver of st-link/v2-1. It don't connect. please show me the image of connecting your PC with target board of the ST kit B-L072Z-LRWAN1.

Thans for your help. David

.

[Tesla DeLorean]

Posted on October 03, 2017 at 23:29

Make sure you have current drivers, they should install as part of the ST-LINK Utilities package, or as the driver only package. You should see 4 or so devices come up related to the ST-LINK, VCP and MSC, etc

Connect directly to the PC, not via a hub. Try another cable, or USB port.

[Andrew Neil]

Posted on October 27, 2017 at 13:27

marsh.nick wrote:

The SX1276 has a much wider frequency range. 130 - 1020MHz over the SX1272 860 - 1020MHz

that new ST Kit B-L072Z-LRWAN1 has this new SX1276.

Ah - but the

B-L072Z-LRWAN1 has that chip inside the muRata module - so that only the >799 MHz range is available (ie, the 868 & 915 bands).

See the muRata datasheet.

[Tesla DeLorean]

Posted on November 09, 2017 at 22:07

LRWAN successfully ported to STM32F769I-DISC1 board using the SX1272 shield.

PoE powered node.

[Tesla DeLorean]

Posted on December 01, 2017 at 21:14

LRWAN ported to the STM32L4R9I-DISCO (L4+)

board using the SX1272 shield.