chris_c
Posts: 156
Joined: Sun May 06, 2012 10:23 am

jumper lead pins power out only?

Wed Sep 23, 2015 6:21 am

Couldnt find a circuit diagram for the interface board, so its not clear what the jumper pins are, are they the output of some regultion circuit, or just the ground and 5v rails ?

Is it okay to power the board from these pins? I'm not a great fan of delcate fiddly micro usb sockets !

ame
Posts: 3172
Joined: Sat Aug 18, 2012 1:21 am
Location: Korea

Re: jumper lead pins power out only?

Wed Sep 23, 2015 7:04 am

chris_c wrote:Couldnt find a circuit diagram for the interface board, so its not clear what the jumper pins are, are they the output of some regultion circuit, or just the ground and 5v rails ?

Is it okay to power the board from these pins? I'm not a great fan of delcate fiddly micro usb sockets !
Here's a schematic:
https://www.raspberrypi.org/wp-content/ ... .2_027.pdf

Yes, it's ok, and a common technique, but you will lose the protection of the input fuse (F3).

chris_c
Posts: 156
Joined: Sun May 06, 2012 10:23 am

Re: jumper lead pins power out only?

Wed Sep 23, 2015 11:53 am

Thanks for answering a different question to the one I asked....

to reiterate I am talking about the jumper pins on the display interface I am NOT talking about the GPIO pins on the RPI itself

is it okay to power the display interface board from the jumper pins rather that the micro usb port

ame
Posts: 3172
Joined: Sat Aug 18, 2012 1:21 am
Location: Korea

Re: jumper lead pins power out only?

Wed Sep 23, 2015 12:24 pm

Ah, sorry. My bad.

I thought I had an answer, but I'm not so sure.

The discussion here mentions using jumper wires to connect 5V and GND from the Pi. (emphasis mine).
https://www.raspberrypi.org/blog/the-ea ... i-display/

You're right. A schematic would be nice.

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