Siberian23
Posts: 1
Joined: Sat Mar 04, 2023 6:37 pm

Using touch screen 7" as display for PC based application

Sat Mar 04, 2023 6:51 pm

Hello,

I have a 7" element 14 touch screen display.

Instead of interfacing the touch screen via the ribbon cable to the raspberry pi. I would like to purchase an adapter that goes from the FFC ribbon cable to a female (or male) hdmi cable. Then I would have an application on a mini pc use the 7 inch monitor to display the application.
FFCToHDMI.PNG
FFCToHDMI.PNG (201.2 KiB) Viewed 3278 times
I have seen the arducam CSI to HDMI cable extension (in the link below) however the FAQ seems to indicate that this will not work for driving an HDMI.
https://www.amazon.com/gp/product/B06XD ... UTF8&psc=1
FAQ.PNG
FAQ.PNG (71.11 KiB) Viewed 3278 times
If anyone in the community has experience with this any help would be greatly appreciated.

Maybe I am missing something but the only way I would think it shouldn't work is if the pinout on the touchscreens SFW15R-2STE1LF is mapped in a nonstandard way. However, if that is the case I would think someone somewhere would have made a breakout to compensate for this.

Thanks,
Chris VanOosterhout

aBUGSworstnightmare
Posts: 7797
Joined: Tue Jun 30, 2015 1:35 pm

Re: Using touch screen 7" as display for PC based application

Sun Mar 05, 2023 7:11 am

There is no 'off-the-shelf' adapter for converting HDMI to the 7in DSi available.
If you need a 7in display with HDMI look i.e. At waveshare products which build them on purpose.

6by9
Raspberry Pi Engineer & Forum Moderator
Raspberry Pi Engineer & Forum Moderator
Posts: 14836
Joined: Wed Dec 04, 2013 11:27 am
Location: ZZ9 Plural Z Alpha, aka just outside Cambridge.

Re: Using touch screen 7" as display for PC based application

Sun Mar 05, 2023 7:21 pm

DSI and HDMI are not the same physical interface, therefore it's not a simple rewiring of signals between the 2 different connectors.

The 7inch display also needs configuration over the DSI interface, so any interface board would need to be customised for that display.

The Arducam CSI to HDMI adapters are only remapping signals in order to reuse HDMI cables to extend the camera. HDMI cables happen to have the right number of screened pairs of conductors (plus a few extra singles) for carrying the camera signals. It does NOT convert CSI to HDMI or vice versa.
Software Engineer at Raspberry Pi Ltd. Views expressed are still personal views.
I'm not interested in doing contracts for bespoke functionality - please don't ask.

morganjk
Posts: 1
Joined: Wed May 31, 2023 5:31 pm

Re: Using touch screen 7" as display for PC based application

Wed May 31, 2023 5:35 pm

would this HDMI decoder from adafruit work?

viewtopic.php?p=2087164&hilit=hdmi#p2087164

TFP401 HDMI/DVI Decoder to 40-Pin TTL Breakout - With Touch

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