Loko-the Tiniest GPS tracker with 270 days battery

https://www.seeedstudio.com/Loko-GPS-Tracker-p-6261.html

In order to customize or develop firmware for Loko air units, you’ll need to connect an ST-link debugger to the unit. To make this easier, I equipped Loko Air units with a USB-C connector and hardware debug pins on a small USB-C extension board. This lets you use jumper cables to easily connect the debugger to Loko and start coding. CubeIDE is the preferred method to write code to Loko Air unit. All the firmware code is available in the project’s GitHub repo.

The Loko Ground unit firmware is written in on MicroPython, which makes coding much faster and more accessible. For this task, you’ll need to install the ThonnyIDE on your PC and connect it to the Loko Ground unit via USB. No additional hardware is required.

Connecting multiple Loko Air units ( GPS transmitters) to a single Ground unit ( receiver )

for ordering Loko : https://www.crowdsupply.com/nolilab/loko

Loko Crowdsupply Campaign

after stm32L072 went to silicon shortage , I changed the pcb design, now used only E5 module as main MCU and Radio module . For this I developed native firmware for stm32WL chip . 

so far I achieved  sleeping current consumption 18uA, working current consumption 36mA. 

I used nordic power profile kit 2 to measure the consumption precisely.

finishing the hardware and software tests, moving to field tests. Loko coming very soon.

https://www.nolilab.com

Because of silicon shortage I cannot find STM32L072 chip that I used on last prototype,  I decided to remove the secondary MCU and develop native firmware on stm32WL chip ( Lora-E5)

stable version of firmware added on GitHub .

everybody Wellcome)

https://discord.gg/sJD4xcgW