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Connect Touchscreen LCD to RP from 2m distance

mr.heidari63

Hi there,

 

Tho I did some projects with MCUs, I am almost new in RP.

I have a project with 4" touchscreen LCD and RP 4 and I know there are lots of videos in YouTube about how to connect them.

But my problem is that, I have to install the LCD on control panel door and put the RP inside the cabinet where they are almost 2 meters far from each other.

I want to use the touch feature, so HDMI cable just works as RP output and I can't use it for transferring data from touch to RP.

So, what is the best, professional and preferably cheapest way to connect my LCD to RP to avoid any trouble later? Also I need to have access to the rest of my GPIO to be able to connect sensors and relays as well.

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  • 0

    Hi Reza,

     

    HDMI will work over this distance, and you may be able to get your touch interface to operate too (I don't know what protocol you're referring to), you can look at 'KVM' style solutions for server racks, they operate over such distances too, and transport mouse and keyboard interfaces too. However, I don't think they are cheap. If it's a one-off you might find a used one on for a few hundred $ on ebay, and plug it directly into your Pi, and save all the effort. If you're trying to assemble this yourself it might not be too robust, especially if you're using interfaces not designed for long distances (e.g. USB might work, I2C might not reliably - you'd have to try it).

    If all you want is a tiny display, then presumably you don't want too much interaction, so you could try different options, here are a few ideas, I don't know if they are appropriate or not for your environment:

    (a) run an SPI display (instead of HDMI) and touchscreen with a separate microcontroller, and communicate to the Pi using (say) USB or RS232

    (b) move the Pi to where your touchscreen is

    (c) use a mobile phone or tablet.. they are not too expensive, especially used for a few tens of $ perhaps, and you can then move the problem to software instead of hardware.

Reply
  • 0

    Hi Reza,

     

    HDMI will work over this distance, and you may be able to get your touch interface to operate too (I don't know what protocol you're referring to), you can look at 'KVM' style solutions for server racks, they operate over such distances too, and transport mouse and keyboard interfaces too. However, I don't think they are cheap. If it's a one-off you might find a used one on for a few hundred $ on ebay, and plug it directly into your Pi, and save all the effort. If you're trying to assemble this yourself it might not be too robust, especially if you're using interfaces not designed for long distances (e.g. USB might work, I2C might not reliably - you'd have to try it).

    If all you want is a tiny display, then presumably you don't want too much interaction, so you could try different options, here are a few ideas, I don't know if they are appropriate or not for your environment:

    (a) run an SPI display (instead of HDMI) and touchscreen with a separate microcontroller, and communicate to the Pi using (say) USB or RS232

    (b) move the Pi to where your touchscreen is

    (c) use a mobile phone or tablet.. they are not too expensive, especially used for a few tens of $ perhaps, and you can then move the problem to software instead of hardware.

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