[TriEmbed] Pi Zero W -- Touch Display Troubleshooting

[Scott Hall]

Remember that the Pi-Zero does not have the same memory or processor
capability that the Pi-4 does.  Think of it more like a Pi-2 when it comes
to resources.  Try your image, touchscreen and code on an old Pi-2 to see
if it still works on that.

- sgh

On Mon, Jun 6, 2022 at 9:17 PM Huan Truong via TriEmbed <
triembed at triembed.org> wrote:

> You could try watching the dmesg for any disconnection of usb
>
> $ sudo dmesg -w
>
> Then touch the screen and see if there's anything weird.
>
> You could also watch for x events.
>
> $ xev
>
>
>
>
> Huan Truong
> tnhh.net
>
> On Jun 6, 2022, at 5:38 PM, Ron Craig via TriEmbed <triembed at triembed.org>
> wrote:
>
> 
> Hi, gang.
>
> I bought this display
> <https://www.amazon.com/dp/B07L6WT77H?psc=1&ref=ppx_yo2ov_dt_b_product_details>
> from Amazon. It states it works with the Pi Zero, but I cannot get Touch to
> work on that. Touch works fine on a Pi 4B, but not the Zero.
> Any hints?
>
> I have made my own cables where needed, but Touchscreen still does not
> work.  I am including my wiring setup below.  Am I missing something?  The
> arrow on the OS screen moves the *first *time I touch the screen, but
> will not move after that.  I think it is a software issue?  Are there
> drivers needed for the Zero?
>
>
>
>
>
>
>
>
>
>
>
> *pi at hamclock:~ $ cat /etc/os-releasePRETTY_NAME="Raspbian GNU/Linux 10
> (buster)"NAME="Raspbian GNU/Linux"VERSION_ID="10"VERSION="10
> (buster)"VERSION_CODENAME=busterID=raspbianID_LIKE=debianHOME_URL="http://www.raspbian.org/
> <http://www.raspbian.org/>"SUPPORT_URL="http://www.raspbian.org/RaspbianForums
> <http://www.raspbian.org/RaspbianForums>"BUG_REPORT_URL="http://www.raspbian.org/RaspbianBugs
> <http://www.raspbian.org/RaspbianBugs>"*
>
> *pi at hamclock:~ $ uname -aLinux hamclock 5.10.103+ #1529 Tue Mar 8 12:19:18
> GMT 2022 armv6l GNU/Linux*
>
>
> In the picture:
> 1: Power Block (5V 3.5A) to MICRO USB power connector on the Zero W.  No
> under voltage warnings. All looks good.
> 2: DIY 4-wire cable from JST to MICRO USB connector on the Zero W.
> Substitute for the 5V+Touch connector on the side.
> 3: Supplied FPC to MINI HDMI connector on the Zero.  Reaches fine once I
> moved the Zero to another location (was too short if the Zero was installed
> where suggested).
>
> [image: Zero Connections small.png]
> I've put Kapton tape on the back of the Zero W to prevent any electrical
> shorts with the unused mounting post.
>
> On bootup to 32-bit Raspberry OS, the desktop appears properly and the
> picture looks great.  I can touch the screen EXACTLY ONE TIME, and the
> arrow cursor will move to where I touched the screen.  It never moves after
> that.
>
> The application I use does not require a keyboard if I can use a
> touchscreen. Without touch, I need a bluetooth mouse, which I would rather
> not use. There are less expensive non-touch screens I think I could use if
> touch will not work.
>
> Any help is greatly appreciated. I've already printed a nice case and
> swinging mounting arm for this display, so I would love to keep it and use
> it if I can get touch to work.
>
> Note that I've also tried power through the 5V IN connector, but the
> behavior is exactly the same.
>
> Generally, are there any gotchas with Touch and the Zero or Raspberry OS
> in general I could try?
>
> Best,
> --
> Ron Craig   KO4RON
> J'ai bonne espérance!
>
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>

-- 
Scott G. Hall
Raleigh, NC, USA
scottghall1 at gmail.com
*Although kindness is rarely a job, no matter what you do it's always an
option.*
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