Hello,
I want to connect a touchscreen to the Radxa Zero.
There is one HDMI Port. I want a touchscreen connected and a additional HDMI port to optionally connect another screen and use two screens.
Can I connect a touchscreen with the GPIO Pins?
Is there a touchscreen who someone can recommend to me. It should have a size of 5 inch.
I don’t quite get it
Touchscreen and HDMI are two different things, HDMI don’t have any thing to do with touchscreen control, It outputs video signal only. if you need 2 monitors, use a HDMI splitter to connect them. touchscreen control usually interfaced by USB or I2C.
There are some touchscreens for the Raspberry pi who are connected through GPIO and the touch works. I just want to ask what there are for options to connect a touchscreen.
Hello
I use the waveshare 5" screen (800x480) with Twister OS.
i connected the touchscreen over usb OTG USB host
and over hdmi
@Stigi thank you. I think also need a touchscreen with HDMI.
Hey,
can you send me a link where I can buy the touchscreen you have?
Do you had to make some configuration to make it work?
Think that one is the https://www.waveshare.com/wiki/5inch_HDMI_LCD_(B)
Which specific model did you have @Oli ?
I have the Waveshare 5.5 AMOLED Touchscreen: https://www.waveshare.com/wiki/5.5inch_HDMI_AMOLED
But it doesn’t work with Radxa Zero, so I want to buy a new one.
I am having a punt on one of these https://www.aliexpress.com/item/1005003590392381.html
As with the new Radxa Zero2 there is only HDMI audio and may end up the same but hey you can just test and list here.
Would be good if working or not anyone with a specific model could list here to results.
I will let you know when it arrives
It would be great to hear your review for it.
The waveshare 4" HDMI I have not so good but works on Pi
https://www.waveshare.com/wiki/4inch_HDMI_LCD
I am liking the usb touch interfaces over gpio as cuts out likely i2c/spi drivers.
I found the same but with more features: https://eckstein-shop.de/Waveshare5inchDisplay800x480capacitiveTouchscreenLCDHHDMI
This screen would be much cooler because you can connect speakers and AUX optionaly.
Do you think this wouldn’t work too?
You just don’t know until you have tried it that the defaults match defaults before you start either a DTB or userspace tools to alter resolution, rotation, touchscreen and audio.
If someone says it works then you know you have a much easier ride than a guesstimate based on a product data in a shop window.
All screens should work but someone has already gone to the trouble of creating dtb / userspace settings that work as in the raspberry pi.
Why hdmi audio doesn’t seem to work on your last screen is a mystery whist it works on full screen.
Like the one I have purchased above also has audio onboard but a usb soundcard is a couple of $ and likely no worse than built in.
I just like built-in as the Radxa Zero uniqueness is size so if you can make a tiny handheld console that isn’t too big and bulky that is a main priority with me.
Which also brings me to autoscalers that some screens do have also are a negative as your device could be outputting 1080p and being scaled down as low as 800x480 like the one I got.
I don’t know if the scaler is fixed or the output is fixed so I purchased one to find out.
So that could mean the GPU is wasting its framerate for no need irrespective if working or not.
For many who want 1080p the keyring size nature of the zero is just great to plug into TV or monitor as the only advantage of a small screen is to make it mobile.
HDMI is supposed to be able to supply 5v 300ma and with 5v 500ma usb if that spec was universally adopted you prob could power a Zero2 via a single usb2 but think unless marked MHL which is a spec of MHL1 500ma and MHL2/3 900ma as don’t bother with tiny eye straining screens and the RZ is this amazing tiny keyring computer.
So the answer will it work plug and play is a maybe and likely with a bit of work a dtb or userspace settings can be given as they do work with the Pi.
The only way to be certain is that another user has said definitely its good and supplies settings if needed.
Yes you are right. I just have to try. Its my priority too to make the device as thin as possible.
I have some updates.
By just asking the seller of the touchscreen I postet he told me that he has no valid drivers for the Radxa Zero. He told me, that the Radxa Zero is based on the Arduino. And there are no driver existing for this. Im wondering because @Stigi has a Waveshare screen too. So why does this works and the one who I found not? I additionally think, that this is the same screen but with different features.
I think your seller has a lesser idea than any of us as the R0 certainly isn’t based on a Arduino 
You are talking about just audio again? Or is this the one with the black screen? Prob better you quote a model so at least I don’t get confused.
Sorry for the confusion. I mean this touchscreen https://eckstein-shop.de/Waveshare5inchDisplay800x480capacitiveTouchscreenLCDHHDMI
Yeah 5inch HDMI LCD (H) https://www.waveshare.com/wiki/5inch_HDMI_LCD_(H) that one
It works but just no audio…
Ah cool that sounds good. But why is audio not working?
Dunno oli haven’t got a working R0 with me or a lcd with audio out near me.
Try this as its just a Goggle guess of something similar and also just check alsamixer that the volumes are like pulse audio are saying and not muted or 1%
sudo nano /etc/pulse/daemon.conf and change this line.
Replace this line in the file ; default-sample-rate = 44100 to this:
default-sample-rate = 48000
pulseaudio -k will kill it and it should start back up automatically
