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.

tsaG
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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.
Software Engineer at Raspberry Pi Trading. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.

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.)

alphanumeric
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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.

6by9
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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.
Software Engineer at Raspberry Pi Trading. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.

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