My first topic, here goes: We're prototyping a pump controller using the 2009 and have hooked up a 7809 regulator to take the 13.8 volts some supplies and batteries provide (and which also powers our pump) to send 9 volts to the Arduino input. I've studied the schematic ( http://arduino.cc/en/upload…

How to bypass the barrel jack Duemilanove?

gravelbar July 30, 2010, 9:00pm 2

Maybe add our own protection diode? Then could tap right into the Vin and be safe.

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