Thank you both, I've selected the DOIT esp32 Dev kit. I now get a "Native serial port, can't obtain info" error, so that's at least progress right? ...

@larry-manson &@MadMisha Thank you both for your replies. I program in C++, have done so since i learned it at university. I like the Arduino ID...

Hi, sorry about the quality of the images. I think it might be due to flash bounce back from the coffee table. I'm using the one you picked, I had jus...

Thank you @Byron & @dronebot-workshop!Sorry, the "."was added by my stupid auto-corrupt, I have taken it out, & have given it a VERY stern war...

Hey Bill, You were right, I've found everyone here to be kind & willing to help. The battery Charger case is waiting for me to get the...

@byron A big THANKS! I'm at work, but took a quick glance, & this might BE the solution to my problem. I'd tried to have just the board ...

@byron Thanks, I'll take a look(I'm at work ATM). That explanation seems what I need, I'm just frustrated that I'd need to do that, when it MUST be...

OK, I've largely got this working now, both the INA219 & BatteryHolder classes are finally playing nice. Now i just have to work out how to have f...

Okay, I'm so sorry, I'm not doing this intentionally, I'm trying to learn C++. I even bought a second hand copy of 'C++ Primer' by Lippmam, Lajoie &am...

I've found the problem, I have declared the Adafruit_INA219 as a private member of the BatteryHolder.h file. I've altered lots of things, I have to no...

Hi, I think I'd already tried this. If I put this in my main Battery_Charger_v2.INO file; #define I2C_ADDRESS1 0x40 //address of INA219 current ...

URGH, I perhaps spoke too soon? I'm using a INA219 current sensor, to track the current applied to the rechargeable battery, & have four of ...

The first iteration you provided led to these errors; IRF540_Test_take_2:48:21: error: no matching function for call to 'BatteryHolder::BatteryHolde...

Thank you for your response. Unfortunately, I tried that method two days ago, & had tried EVERYTHING I could think of! Doing it as you suggest...

@ruplicator, Gosh, I'm SO sorry you've found yourself at an impasse. I want to learn how to use a PCB design software package & have them prof...