It is connected to a mac mini that is getting rather hot and must stay on for an extended period of time during the installation. Even an xx74xx14 hex Schmitt inverter IC at each end would be useful. Reverse clamp diodes to power supply rails on all lines a good idea. (Lightning & ground rise from power fault only maybe but. Induction, leakage, electrostatic charge. I am running (and receiving) a number of multiplexers and relays from the digital and analog ports and am thinking the safest way to deliver the steady power for all the outputs is from external power. Some danger to Arduino with longish runs of cable.
#Arduino external power supply serial
I need that Serial Connection, but don`t want to draw power from the computer along the USB.more than needed for the Serial communication I mean. The board can operate on an external supply of 6 to 20 volts. Leads from a battery or DC power supply can be connected to the Gnd and Vin pins. The Micros web page states 'External (non-USB) power can come either from a DC power supply or battery. Will the Arduino draw its power from the external supply or the USB cable? Furthermore, will attaching an external supply interfere with the Serial Communication along the USB connection between the Arduino and the Computer? So, it isnt clear how you are powering the Arduino. If I have my Arduino connected to a computer with a USB cable and also connect a 9v DC supply to the Arduino at the same time, what happens exactly?
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