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HermannSW
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Location: Eberbach, Germany
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[SOLVED] RB-LCD-7P4-Case problems

Fri Dec 25, 2020 9:11 pm

I got real surprised by the Christmas presents from my adult children and wife (never stated to want this):
Official foundation display, RB-LCD-7P4-Case and Logitech K400+ wireless keyboard.

Today my older son and I tried to install my 8GB Pi4B and the display into the case according instructions:
https://joy-it.net/en/products/RB-LCD-7P4-Case

The instructions were good, but the case openings for USB-C, HDMI connectors and 3.5mm jack were completely wrong:
7P4.orig.15%.jpg
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Only with force it was possible to get the power cable connected at all.
I thought on using my Dremel (will have to use that for CSI-2 camera cable anyway).
But found a simpler solution.

The <M3 screws that fixate Pi4B on standoffs were long enough.
I searched and found four M3 nuts, reopened the case, inserted between standoffs and Pi4B.
Now everything is where it should be -- unlikely that nuts were missing, since they are not mentioned in instructions:
(you can see one added nut left below USB-C PCB)
.
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The fan is quite loud, and therefore I disconnected it for testing without.
With fan temperature rose from 37°C to only 54°C when running cpuburn-a53.

Perhaps I was a bit too used to using my Pi400 (same 37..54 range without fan), I did measure with cpuburn again.
Started with 41°C ... and ended with 80°C -- I had forgotton about that.
My Pi4B did hang on bookshelf before, with air on both sides, no fan needed.
In case the new case will turn out to be a real (not artificial cpubrun) heat problem, I will reopen and connect fan, but with an on/off switch on the outside.


The 3.5mm Jack was too near to case for my newer loudspeakers, but a very old one with bendable jack fits perfectly. After using raspi-config for Audio on 3.5mm jack, youtube video sound is good to hear:
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https://stamm-wilbrandt.de/2wheel_balancing_robot
https://stamm-wilbrandt.de/en#raspcatbot
https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://github.com/Hermann-SW/raspiraw
https://stamm-wilbrandt.de/en/Raspberry_camera.html

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HermannSW
Posts: 4025
Joined: Fri Jul 22, 2016 9:09 pm
Location: Eberbach, Germany
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Re: [SOLVED] RB-LCD-7P4-Case problems

Mon Jan 18, 2021 12:13 pm

First I used the display mostly with wireless keybord, lately with touch. While 7" display size is acceptable (I prefer 26$ in total 1024x600 9" HDMI no-touch display), with touch 800x480 is definitely too small display resolution. Even with wireless keyboard some gui software is unusable, when popups are much larger than 480 pixels vertically.
https://stamm-wilbrandt.de/2wheel_balancing_robot
https://stamm-wilbrandt.de/en#raspcatbot
https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://github.com/Hermann-SW/raspiraw
https://stamm-wilbrandt.de/en/Raspberry_camera.html

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HermannSW
Posts: 4025
Joined: Fri Jul 22, 2016 9:09 pm
Location: Eberbach, Germany
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Re: [SOLVED] RB-LCD-7P4-Case problems

Sun Apr 11, 2021 7:47 pm

Sadly I am in hospital again. This time it was easy for my family to collect just my 8GB Pi4B in case with official display, K400+ keyboard dongle and keyboard as well as power supply. I got Pico+(DVI) and Arducam Pico4ML as well.

It turned out that the 800x480 is not that bad as I stated previously.
I need to read the Pico PDF documentation, and after I found out to click on the three horizontal bars to make the left contents menu disappear, documention is good to read just in browser.

I had turned off the (loud) fan, and saw temperature go above 80°C with cpuburn, but running "pico_setup.sh" reaches 69°C, but kept below 70°C.

With Logitech K400+ wireless keyboard I use the official display as display only, no use of touch functionality.
20210411_211040.15%.jpg
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When back at home I will dremel away part of case to make GPIO pins accessible as in Pi400 -- now the case does not let me use UART connection to the Picos, but USB works.
https://stamm-wilbrandt.de/2wheel_balancing_robot
https://stamm-wilbrandt.de/en#raspcatbot
https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://github.com/Hermann-SW/raspiraw
https://stamm-wilbrandt.de/en/Raspberry_camera.html

aBUGSworstnightmare
Posts: 2808
Joined: Tue Jun 30, 2015 1:35 pm

Re: [SOLVED] RB-LCD-7P4-Case problems

Mon Apr 12, 2021 6:50 am

Gute Besserung!

You may want to try this viewtopic.php?f=140&p=1850254#p1850254 as it should give you 'some more pixels'. The 7in screen is DSI-1, so change the command.

Or change the framebuffer settings to 1024x614 when using legacy driver.

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HermannSW
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Location: Eberbach, Germany
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Re: [SOLVED] RB-LCD-7P4-Case problems

Mon Apr 19, 2021 9:19 pm

I found a better arrangement of Pi4B with official display and RB-LCD-7P4 case in hospital:
20210419_222856.15%.jpg
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The hospital scissor does not only help as stand for Arducam Pico4ML (100% part of previous 16MP photo) ...
Pico4ML_foot.png
Pico4ML_foot.png
Pico4ML_foot.png (138.08 KiB) Viewed 148 times

... but was a good tool for providing access to Pi4B GPIOs in absence of Dremel or other tools from home. With endurance I did drill holes into the case first with scissor, and then forced away bigger parts of acryllic case. The open part allows access to GND+GPIO14+GPIO15 I need for UART connection to Pico for adding networking over USB for Pico Micropython (REPL over UART)
viewtopic.php?f=146&t=309936
20210419_223815.15%.jpg
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Only these pins are used from Pi4B for driving officila display:

Code: Select all

display  Pi4B
GND      Pin14
5V       Pin2
SDA      Pin3
SCL      Pin5

P.S:
Really works:
viewtopic.php?f=146&p=1854481#p1854481
Image
https://stamm-wilbrandt.de/2wheel_balancing_robot
https://stamm-wilbrandt.de/en#raspcatbot
https://github.com/Hermann-SW/Raspberry_v1_camera_global_external_shutter
https://github.com/Hermann-SW/raspiraw
https://stamm-wilbrandt.de/en/Raspberry_camera.html

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