Bill WA9BA
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Hook-up 7" touch screed

Fri Jun 03, 2016 12:39 pm

I am new to the PI.
I bought a 7" touchscreen display and am confused about hooking it to the PI.
The ribbon cable I understand, but the extra 4 wires have me confused, what are they for?
Bill

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Laurens-wuyts
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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 12:44 pm

These are to connect the I²C from the display to the pi if you have an older pi.
You do have to connect the 5V and GND wire from the display to pin 2 and 6 of the raspberry pi.


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alphanumeric
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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 1:44 pm

If you power it via the micro USB port, you don't need to use any of those jumper wires. ;)

6by9
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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 1:50 pm

alphanumeric wrote:If you power it via the micro USB port, you don't need to use any of those jumper wires. ;)
Unless you want to power your Pi via the display to save a power supply.
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alphanumeric
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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 2:01 pm

6by9 wrote:
alphanumeric wrote:If you power it via the micro USB port, you don't need to use any of those jumper wires. ;)
Unless you want to power your Pi via the display to save a power supply.
Yes, lots of ways to do it. I could have worded my post better. I was trying to say, you don't have to use them, they are optional depending on what you have on hand. I have a ribbon cable/cobbler hooked up to my Pi. No easy way to use those jumpers with that setup. My Pi and display are each feed power via their micro USB ports. I use common 5V 10A power pack though.

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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 2:25 pm

And what about the touch screen? This is also handled when connecting it over USB? ;)

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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 2:29 pm

tsaG wrote:And what about the touch screen? This is also handled when connecting it over USB? ;)
I think the touchscreen goes over the DSI connector :? (Not sure though)

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6by9
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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 2:30 pm

Laurens-wuyts wrote:
tsaG wrote:And what about the touch screen? This is also handled when connecting it over USB? ;)
I think the touchscreen goes over the DSI connector :? (Not sure though)
Correct.
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alphanumeric
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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 3:03 pm

Yes, the touch panel part also goes over the DSI. The USB is for power only.

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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 3:05 pm

6by9 wrote:
Laurens-wuyts wrote:
tsaG wrote:And what about the touch screen? This is also handled when connecting it over USB? ;)
I think the touchscreen goes over the DSI connector :? (Not sure though)
Correct.
Noted :D

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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 4:06 pm

6by9 wrote:
alphanumeric wrote:If you power it via the micro USB port, you don't need to use any of those jumper wires. ;)
Unless you want to power your Pi via the display to save a power supply.
No. The display controller has a USB-A port that can be used to power the attached Pi. (That's the way I do it.)

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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 4:25 pm

W. H. Heydt wrote:
6by9 wrote:
alphanumeric wrote:If you power it via the micro USB port, you don't need to use any of those jumper wires. ;)
Unless you want to power your Pi via the display to save a power supply.
No. The display controller has a USB-A port that can be used to power the attached Pi. (That's the way I do it.)
You can also power your PI from the display board using two of the jumper wires via the +5 V and Ground pins to the appropriate pins on the Pi's GPIO header.

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Re: Hook-up 7" touch screed

Fri Jun 03, 2016 4:28 pm

alphanumeric wrote:
W. H. Heydt wrote:
6by9 wrote:Unless you want to power your Pi via the display to save a power supply.
No. The display controller has a USB-A port that can be used to power the attached Pi. (That's the way I do it.)
You can also power your PI from the display board using two of the jumper wires via the +5 V and Ground pins to the appropriate pins on the Pi's GPIO header.
And that's the way I do it. At least you can then see the thickness of the conductors.
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Please don't send PMs asking for support - use the forum.
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