[TriEmbed] Is there a FET trick for this?

[Chip McClelland]

All,
Down to the final stretch on my new board - just need one more piece of
advice.

I am trying to see if there is a way to accomplish something without
resorting to a physical jumper. I would like to use the FTDI header on my
new board in two ways with respect to the power pin.

1) when I connect a FTDI connector, it could power the board. The power pin
is connected directly to the board's power rail. This is how it is today.

2) when I connect the Adafruit UART friend, I can turn it on and off using
one of the Arduino's digital pins.  In this scenario, I only want the power
pin connected to the digital pin on the Arduino.

Is there some way to automatically switch between these two modes based on
whether there is power supplied by the FTDI adapter?

Thanks,

Chip




-- 
Sent from my iPhone - please excuse the typos
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