Module v4.50 hex versions

DrPinball · 10 March 2025 15:29

Hi
Can anyone tell me what the different versions of module v4.5 hex files are?
The only difference in the names is 2K4, 5K and 10K - are these thermistor values?
Cheers
David.

DrPinball · 10 March 2025 17:21

Just worked this out - it’s different baud rates for the serial comms.

fpv12 · 18 June 2025 18:46

came across your query i have built some 4.5 boards .I am at a loss on how to program
the attiny1624.Can you tell me what programs you are using to program the board.I have built 16 of the 4.4 and programes them ok.But not a lot on youtube for flashing hex to these chips any pointers would be great.

DrPinball · 19 June 2025 14:50

The repositories on Github are not well organised for the v4.5 board. The code can be found here:

This also has a link to the binary files you’ll need - the different variants of firmware for v4.5 relate to the baud rate for comms between the boards and the controller. I just used the basic controller which defaults to 2400 baud.

The instructions for flashing the v4.5 modules can be found here:

github.com/stuartpittaway/diyBMSv4ESP32

ProgrammingHardware.md

master

# DIYBMS v4 Programming The Hardware

## Programming the controller (ESP32)

ESP32 controller board uses "Dev Kit C" compatible controller boards using the ESP32-WROOM-32D (4MB)

Suitable boards are available from Amazon 
* https://amzn.to/3aTc3cS
* https://amzn.to/3a4GOfK

(affiliate links)

### Code

First step is to upload the main controller code to the ESP32.

You can flash the ESP32 whilst it is connected to the diyBMS controller board, no need to remove.

1. Unplug the ESP32 from its power supply/USB cable
1. If its not already, insert the ESP32 into the controller board, ensure that the ESP's USB connector faces towards the bottom of the board, facing the black ISP connector

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I think I used this programme design: