Welcome! Log In Create A New Profile

5V out from ramps / Arduino

Posted by Crux

Forum List Message List New Topic

Crux

5V out from ramps / Arduino
August 12, 2014 07:24AM

Registered: 13 years ago
Posts: 78

Hi.

I want to plug a USB led light in a piece like this:

photo_1_preview_featured.jpg

I have this cable already:

$_57.JPG

I want to use the USB only to power out 5V. Not to transfer data.

Where can I connect it to be able to do it? If I connect in Arduino USB port type B, it will not power out anything sad smiley

Thanks in advance!

Reply Quote

cdru

Re: 5V out from ramps / Arduino
August 13, 2014 10:25AM

Registered: 12 years ago
Posts: 869

You can get +5v from the Vcc pin next to the reset button on the ramps board. Note that you're limited by how much current you can draw via that pin and the more you draw, the hotter the voltage regulator will run. If you're using an ATX power supply, you'd be better off using a 5v line from there. Or just get a 7805 voltage regulator and power it from a 12v line.

Reply Quote

jaguarking11

Re: 5V out from ramps / Arduino
August 13, 2014 10:37AM

Registered: 12 years ago
Posts: 469

Another thing that may be just as cheap if your using 12v only psu would be to buy one of those pharmacy store usb car chargers. They are like 4-6usd and wire them to the psu's 12v out. I plan on doing that for my wireless USB bridge.

My Personal Blog. Build blog.
[engineerd3d.ddns.net]

Modicum V1 sold on e-bay user jaguarking11

Reply Quote

Crux

Re: 5V out from ramps / Arduino
August 13, 2014 01:00PM

Registered: 13 years ago
Posts: 78

Quote
cdru
You can get +5v from the Vcc pin next to the reset button on the ramps board. Note that you're limited by how much current you can draw via that pin and the more you draw, the hotter the voltage regulator will run. If you're using an ATX power supply, you'd be better off using a 5v line from there. Or just get a 7805 voltage regulator and power it from a 12v line.

Thank you for the reply. I searched on google. I liked your suggestion! How can I wire the 7805 voltage regulator? Could you explain the schematic for it?

Quote
jaguarking11
Another thing that may be just as cheap if your using 12v only psu would be to buy one of those pharmacy store usb car chargers. They are like 4-6usd and wire them to the psu's 12v out. I plan on doing that for my wireless USB bridge.

Thank you for the reply. I am looking for a 'clean' pro-like solution.

Reply Quote

cdru

Re: 5V out from ramps / Arduino
August 13, 2014 04:10PM

Registered: 12 years ago
Posts: 869

Quote
Crux
Thank you for the reply. I searched on google. I liked your suggestion! How can I wire the 7805 voltage regulator? Could you explain the schematic for it?

There's not much for a schematic. Pin 1 is the input (in your case +12v). Pin 2 goes to ground. Pin 3 is the +5v output. The output plus a ground just need to go to your connector.

You can even just shove it in the power connector then there's only one wire that needs soldered. For you the wire won't go to the ramps board, it will go to your connector.