With appearance of Taiwanese built AcSiP S76G SoC in late 2018, family of STM32L0 based GNSS LoRaWAN asset trackers has become wider.
One known retail product is RAK7200 from RAKWireless (costs around 40 USD + shipping).
One known DIY product is TTGO T-Motion. (costs around 20 USD + shipping)
Good day, this module must be registered? Which app i can use?
Do you mind advice me pls with few instructions so i can make it work?
im looking for the rak7200 or rak5205… or my ttgo motion… but ive saw also Grasshopper LoRa/LoRaWAN Development Board.
Which one is bettere… and voltage conditions?
Waiting for a kind response
Regards
Please see the Tindie product page where a lot of these basic questions are answered and there is a pin map.
But simply, the Grasshopper is designed to be programmed via USB using the Arduino IDE. No external programmer is needed, but you can also use an ST Link V2 to program via the SWD port.
You can load ST/Murata firmware that allows AT command usage, but I have never done this.
The ST dev kits aren’t designed for ultra low power. You probably still have USB enabled as well as the TXCO, etc. Probably not really able to enter STOP mode at all with that board.
I will check the software again vdd_mcu_lora ~ 11mA, in stop mode I could not drop below 2.7mA.I’m closing debug, trace, printf.The pcb I designed for testing gives the same values.
If in your custom design you followed the Grasshopper design and used a CMWX1ZZABZ-078 and are using the Arduino core and Grasshopper board variant then I would expect you would see the same ~2 uA we see in STOP mode.
However, if the module (i.e., CMWX1ZZABZ-072) or pin map is different then I would not expect using the core with the Grasshopper board variant would produce this result.
The B-L072Z-LRWAN1 board design and Arduino board variant are unlikely to produce this result since, as I mentioned, it was not designed for ultra-low power. In fact, certain hardware choices preclude it in this design.
I would like to explain the hardware. I used the LD39050PU33R regulator. I disabled the GPS connections and the existing LEDs as an extra hardware.I’m using cmwx1zzabz-078 and I see 2.7mA in stop mode from pin 5.As a software, I program the software provided by ST on Cubeide. Thank you for helping, I’ll share the results here
Surest way is to redesign your custom board to conform to the Grasshopper design and use the grasshopper Arduino core. The ST CubeMX software is not design for ultra-low power, ironically enough.