Re: Tesla Programmer
Someone did once tell me you can power an Arduino by feeding power INTO the +5V pin on the socket rows although I would worry about that because it would be backfeeding power to the output of whatever normally provides the +5V supply.
Re: Your approach, let's say the Arduino is powered and providing strong output signals, some high, some low, to the logic inputs of the programmer hardware while the chips etc of the programmer itself are not yet powered. I could see that potentially causing problems.
You might need a kind of 'interlock' which enables your programmer board supply only when the Arduino is powered, and disables the programmer board supply whenever power is removed from the Arduino. That way you can never have a powered Programmer shield trying to back-power the unpowered Arduino, or a powered Arduino trying to drive the unpowered programmer hardware.
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