I didn't find a specific category for the Arduino Robot A0000078 but if there is one I hope a mod can move my post.
I bought this secondhand but was assured it was fully functional. The Control Board was a bit difficult to programme but eventually I got the double-tap on the reset correct and triggered the bootloader, now it works and can be programmed fine. However I cannot connect to the motor board. So far the seller has not responded to my queries about this problem and I've not found a solution myself.
When I connect the motor board my computer it is not recognised and does not get a COM port assigned, it doesn't appear in Device Manager at all even as an unknown device. I've tried more than one Windows 10 computer and tried Ubuntu as well. I've tried all troubleshooting suggestions I can find including replugging the USB connection, using different USB ports on my computer, restarting the IDE, double-tapping the reset button at various points including when the IDE says "uploading". Nothing makes the board respond at all.
I don't know what sketch is currently on the board but when I load a test like "Motor Test" example on the control board, disconnect the USB, put the robot on the floor and turn on the power (fully charged batteries), the robot does nothing, no movement.
The red LEDs on the motor board do come on when I have power on and lift the robot from the floor, but I see from the schematics that these appear to be independent of the MCU so are no indication of it is working or not.
Does anyone have any ideas of how to test and resolve this problem please? Is this is a sign of a corrupted bootloader? Does it mean the MCU is dead? How to test these things?