Companion board development
This project was a commercial failure, but we did get a pretty good companion board going in the end.
The software and production files are available on GitHub:
https://github.com/gregyedlik/Yamaha-BMS-companion
Concept: reverse engineered Yamaha battery
Source: https://endless-sphere.com/forums/viewtopic.php?t=70198 Quote: An Arduino compatible boa...
Listening to a Yamaha battery
R = 10k Reading Yamaha communication II (13/08) Regarding the Yamaha battery from worksho...
Current limiting on the data output
On the original board, it is possible to pull the data output to 42V, and the current will be onl...
MOSFET vs BJT
The good thing about the Version 3.0 of our Yamaha Board design is that can fit both BJT and MOSF...
Tuning the data output
Purple trace: Yedlik board Green trace: original board We attached a 10k pull-up resistor to ...
Lowering consumption, Part 1: hardware
Baseline Current consumption, with the transistors disconnected: 9.82 mA @ 30V 7.5 mA @ 42V ...
Lowering consumption, Part 2: Software
Measurement setup Yamaha board V1, with only the Arduino Pro Mini and the RECOM 0.5A 3.3V inst...
Energy use
This is the current waveform in one loop cycle. Higher current when SCI on Lower current when...
Board acceptance test
Setting up the test Turn the current off on the DC supplies before connecting the board, o...