Safe to have USB power and ATX +5 Standby power at same time? I'd like to power my Ramps 1.4/Ardunio Mega from the +5V standby feed (VCC pin on Ramps) from an ATX supply rather than USB. Is there a way to disable the board from drawing power from the USB bus? Is it safe for USB power and 5V standby to be connected and powered at the same time? https://reprap.org/forum/read.php?219,450228,450228#msg-450228 Sat, 13 Jun 2026 14:38:33 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,450228,451690#msg-451690 Re: Safe to have USB power and ATX +5 Standby power at same time? https://reprap.org/forum/read.php?219,450228,451690#msg-451690 This idea came with my Rostock Delta.

So all power comes from one supply.
Works great!]]> Replace RAMPS Electronics Tue, 06 Jan 2015 13:40:11 -0500 https://reprap.org/forum/read.php?219,450228,451198#msg-451198 Re: Safe to have USB power and ATX +5 Standby power at same time? https://reprap.org/forum/read.php?219,450228,451198#msg-451198
Quote
cozmicray
but without USB connection --- how will you control printer?
SD card reader, bluetooth, serial connection via a non-USB interface...]]> cdru RAMPS Electronics Mon, 05 Jan 2015 12:07:54 -0500 https://reprap.org/forum/read.php?219,450228,450981#msg-450981 Re: Safe to have USB power and ATX +5 Standby power at same time? https://reprap.org/forum/read.php?219,450228,450981#msg-450981
Quote
cozmicray

but without USB connection --- how will you control printer?

:S

Yeah, part of the puzzle is missing. What do folks normally do when the USB host is unable to supply sufficient power to the Arduino, LCD, LED's etc?]]> ajm1 RAMPS Electronics Sun, 04 Jan 2015 22:32:35 -0500 https://reprap.org/forum/read.php?219,450228,450958#msg-450958 Re: Safe to have USB power and ATX +5 Standby power at same time? https://reprap.org/forum/read.php?219,450228,450958#msg-450958 There is a coaxial connector there on the end with the USB connector.

You don't have to disable anything
you can pull the USB and 5V supplied from your 5V

but without USB connection --- how will you control printer?

:S]]> cozmicray RAMPS Electronics Sun, 04 Jan 2015 19:08:44 -0500 https://reprap.org/forum/read.php?219,450228,450228#msg-450228 Safe to have USB power and ATX +5 Standby power at same time? https://reprap.org/forum/read.php?219,450228,450228#msg-450228
Is it safe for USB power and 5V standby to be connected and powered at the same time?]]> ajm1 RAMPS Electronics Fri, 02 Jan 2015 19:41:12 -0500