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I like your workaround... very smart. I was trying to figure out what exact ESP board you have (must be the ESP32)...I misunderstood your previous post. That one does have 3 serial ports. Some of the ESP boards have a serial that is transmit only and cannot receive. That may be the case with...

It has been a while since I have messed with an ESP board but my guess is some kind of serial conflict. It looks like you are hooked up to serial 0 on the ESP through pins 13 and 15? If this is the case you have to very careful the Serial.swap command is used after Serial.begin. You might even...

Thanks Nick! That would be amazing! I am really challenging these batteries in our rv using them to run the ac and have a solar array (not to mention in Minnesota). So I would really like to be able to get some graphical feedback as to where the voltage, temperature and SOC are at.

I am wondering if anyone has got the Arduino-XP-BMS code to work with a Mega board (I do see the ESPs above). I would like to use the Arduino Mega 2560 so I can merge this code with the code for getting a graphing interface on a LCD like in this project...