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RepRapDiscount Full Graphic Smart Controller - Screen always on via USB

totalitarian

RepRapDiscount Full Graphic Smart Controller - Screen always on via USB
October 02, 2017 01:06PM

Registered: 6 years ago
Posts: 43

Just installed a RepRapDiscount Full Graphic Smart Controller on my ramps 1.4 board. My issue is that the screen is always on when the board is powered via usb (RPi always connected) Is this normal?

On my old Melzi board there was a jumper to toggle between vref and usb. Vref only powered the lcd when the mains was connected and on.

Edited 1 time(s). Last edit at 10/02/2017 01:07PM by totalitarian.

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obewan

Re: RepRapDiscount Full Graphic Smart Controller - Screen always on via USB
October 03, 2017 12:49PM

Registered: 7 years ago
Posts: 759

Yes its normall, USB 5volt will supply power to the arduino/ramps untill you supply 12olts from a power supply.

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totalitarian

Re: RepRapDiscount Full Graphic Smart Controller - Screen always on via USB
October 04, 2017 05:43PM

Registered: 6 years ago
Posts: 43

Thanks, thought I had done something wrong.

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JustSumGuy

Re: RepRapDiscount Full Graphic Smart Controller - Screen always on via USB
October 05, 2017 12:19PM

Registered: 6 years ago
Posts: 262

I modified my usb cord by cutting the 5v line on the usb end to make it so I could power off my Ramps/Mega combo via the printer switch....

in case you want to...

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Aethelstan

Re: RepRapDiscount Full Graphic Smart Controller - Screen always on via USB
October 09, 2017 03:59AM

Registered: 6 years ago
Posts: 27

I removed the power control mosfet on my Mega, data only USB cable wouldn't work for me.