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ramps and usb

Roger123D

ramps and usb
November 07, 2016 10:04PM

Registered: 8 years ago
Posts: 195

if the ramps 12 volt is the source of power to the arduino via the 5 volt regulator what happens if a usb from a computer is plugged in as well supplying 5 volts or would a special usb cord be needed without power lines

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Dust

Re: ramps and usb
November 08, 2016 02:54AM

Admin
Registered: 13 years ago
Posts: 7,000

Having usb plugged in and power from ramps works fine using normal usb cables.

The mega is designed with this in mind

basically there is a mosfet that selects which 5v to use (mosfet FDN340P)
see bottom right of [www.arduino.cc]