I ran into a little bit of an issue with the old power management system i had installed. The original design was to use a buck converter to drop the battery voltage to 3.3v, this worked fine except the micro controller would not run with 3.3v it needs 5v, so much for reading the manual which said it ran on 3.3v. So then I added a boost converter, except that the BMS would shut down when it was connected.
So onto plan C, i ripped out the BMS, the charge controller and the converter, and am now using an all in 1 unit that is designed to work as shield board for the wemos mini. USB cable will run to the solar panels to charge the lipo’s, the jst connector goes to the batteries and power out is from the 5v pin on the shield. Yeah its ugly, but will work. The 3.3v needed for the sensors will all run off the regulator on the micro. Its a mess, but will work.
Now that crap is sorted, its time to finish off the code and make it work. Thats a job for another night.
