I have changed this projects status to "shelved" as most of it's core components/functionality can now

be found in my new project LLS3.

The reasons for this are the following:

The title reads "unopinionated" which it really wasn't.

It had the albeit optional footprint for the ESP-01M footprint and that kind of bothered me.

I also found the AA sized LiPo cell was probably a bit too much for some projects.

Up until now this prototype was good for developing and testing but I decided to move on

and *really* make it unopinionated module that can be used on a breadboard or soldered onto a PCB.

In the future this project will be revived as something more like a protoboard with an an MPPC IC,

an LLS3 module and who knows what :)

After tinkering around with it for a while I was able to identify some issues with it.

Some of them are an easy fix, others will require some more attention.

The good news is that the main functionality (charger IC) appears to be working just fine so I was

able to write a micropython driver for it (see here).

The driver needs to be built into the firmware as a frozen module because of memory reasons.

The bad news is that the I2C level shifter and the MPPC IC are not connected in the way they

should be but I might be able to fix that with a bit of hot air and a steady hand.

I was also thinking about writing a proper Tasmota driver as well since I think it is a device that fits

well into that ecosystem. However I have no experience with the Tasmota API so that might

take some time...

Today the prototype was shipped and it will arrive in one week. Yay!

I've uploaded the pictures the factory sent me.

I decided against soldering the SMD components myself, since I am not confident  in

my abilities to solder components of this size.

LLS1 Testplatform

lls1-testplatform-code was updated and should now be ready for testing the prototype.

Since ampy occasionally crashes, i decided against using it and incorporate the MicroPython scripts into the firmware itself instead.

Prototype

The assembly is in progress and it should arrive in the 1st week of November if everything goes well with shipping...

MicroPython Firmware

The MicroPython scripts development will start as soon as the prototype arrives.

there will be two MicroPython firmwares:

1. testing device functionality
2. "production"

Test Firmware

• connects to WiFi, gets current time and saves it to the RTC
• sets an RTC alarm
• sets voltages to 3 V and 2 V
• prints TEST_OK if everything went well
• prints TEST_FAIL if something went wrong

the RTC alarm will be read by the Raspberry Pi

the voltages will be verified by the Raspberry Pi

Production Firmware

• contains all necessary drivers
• opens a WiFi AP
• starts a WebREPL
• starts a main loop printing some device info

the test-platform code is publicly available here: https://gitlab.com/leonardp/lls1-testplatform

TODO:

• code for flashing esp firmware
• verify successful firmware upload
• MicroPython test-firmware
• code for uploading MicroPython Firmware
• test it all with the prototype

the estimated time of arrival for the prototype is at the end of October...

added pictures for the test/programming platform.

it's a raspberrypi shield (obviously)  and the sd image is build with nixos (see: lls1-test.nix).

pictures of the assembled testplatform and the code running on it will follow soon...

Done

• Testing Jig PCB Design
• Testing Jig PCB Order
• Testing Jig Parts Order
• Prototype PCB Design
• Prototype Order

TODO

• Testing Jig RaspberryPi Image
• Test Procedure Flowchart
• Testing Jig Code
• Prototype Code (Micropython ESP8285)