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PiTFT - 480x320 3.5" TFT+Touchscreen for RPI 4b issues
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PiTFT - 480x320 3.5" TFT+Touchscreen for RPI 4b issues

by Hansenw on Thu Apr 30, 2020 8:59 pm

I have just purchased the 480X320 3.5 " resistive touch screen and have connected it to a Raspberry PI4 using jumpers. I have double checked wiring and all is correct. The display powers but just shows a bright screen. The RPI is using BUSTER. I have a friend who has used this same display on a RPI 3 without issue. Is there any differences in GPIO pin assignments between the 3 and 4?

Hansenw
 
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Re: PiTFT - 480x320 3.5" TFT+Touchscreen for RPI 4b issues

by jwevd on Fri May 01, 2020 10:10 am

I got it working: RPi 3 B+ [url]Adafruit PiTFT Plus 480x320 3.5" TFT+Touchscreen for Raspberry Pi[/url], Raspbian Buster (desktop withoud recom softw), Python 3.
The main trick was: do not use adafruit-pitft.sh!!
(unfortunately I did not yet figure out the touch control)
I have attached a log of my install from scratch and a simple clock (klok.py)
Hope this helps
Attachments
Raspberrypi-3 - 3.5_ PiTFT Python basic.pdf
(119.39 KiB) Downloaded 10 times

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Re: PiTFT - 480x320 3.5" TFT+Touchscreen for RPI 4b issues

by Hansenw on Fri May 01, 2020 12:54 pm

Thanks,
I went thru your script and find that I do not have either /dev/spidev0.0 /dev/spidev0.1 listed. SPI is enabled, in fact I disabled and reenabled it but still they do not show up. and suggestions?

Hansenw
 
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Re: PiTFT - 480x320 3.5" TFT+Touchscreen for RPI 4b issues

by Hansenw on Fri May 01, 2020 1:37 pm

I think the original script messed a few things up. I was able to use your script as and now have the date and clock displayed on the screen.
Thanks so much

Hansenw
 
Posts: 4
Joined: Thu Apr 30, 2020 6:50 pm

Re: PiTFT - 480x320 3.5" TFT+Touchscreen for RPI 4b issues

by Hansenw on Fri May 01, 2020 10:43 pm

The GPIO pins referenced in the installation instructions are either not complete or incorrect. I have a RTC, and UPS hooked to the PI (4B) which means that the display can not directly connect to the RPI. I connected power, ground, and the SPI GPIO pins as instructed along with GPIO18, 24 and 25. The screen just displayed a bright light. I then connected all open GPIO ports to the display and the display now shows the date and time. By process of elimination I will see which pins are needed and report back.
Attachments
Display Connections.jpg
Display Connections.jpg (355.49 KiB) Viewed 41 times

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