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4,3 or 5 inches Capacitive touchscreen for rpi2

Former Member

Hello

I bought an official 7-inch screen and I've seen that has an adapter board of the signal on the screen and touch control to the DSI port of the rpi

 

I wonder if it would be possible to replace the 7-inch screen with a smaller 4.3 or 5 inches and connect to DSI port on the RPI using the same adapter board

 

Is ther any capacitive touch screen of 3,4 or 5 inches that can connect to the rpi2 without using the HDMI port?

 

The 7 inches oficial touchscreen works fine but is large for my purposes

 

Thank you

  • The adapter board provides a DSI to LVDS adapter and also a touch screen controller (Full controller, not a simple ADC) so any board you use to replace it would need to be compatible with the LVDS interface but I suspect that even the PI Driver is aware of the chip-set on the screen so that too would need to be compatible (The device tree should glean some info on that I would like to think) or someone else may be able to provide better intel on it

    The touch controller on most LCDs is built into the LCD part of the assemble and as such will also not be easy to retrofit (It is capacitive I think, and certainly multi touch (The PI 7" is able to handle 10 touch points simultaneously)

     

    It may be simpler to go with an ebay / banggood screen with HDMI/Touch adapter board that plugs into the PI via the USB (For the touch) and the HDMI port. this way you avoid all that hastle

  • in reply to Robert Peter Oakes

    thank you Peter

     

    you are right

    It would be easier to use the HDMI port and the USB but i want to connect a tv to the hdmi port

    I want to use the rpi for control a machine. The touch screen will be the gui for control the machine and the hdmi port for a tv to see the performance of the machine.

    But the 7" screen is large for the control box of the machine

    Any suggestion?

    Thanks

  • in reply to Former Member

    AH, that changes things a little

     

    The PI does not currently support both the LCD and HDMI at the same time, you have to pick one or the other

     

    A better bet in this case would be to use a PI supported SPI based LCD screen with touch, there are plenty and easy to use. Many mount right onto the PI 40 pin header

     

    Now a better option in my opinion (I am about to do a project like this myself) is to use a display like the Nextion from ITEAD Studio  https://www.itead.cc/display/nextion.html

     

    I have a 2.4, 3.5 and a 7" one (Though I think i broke the 2.4" one image ), these are used through a serial TX/RX port and you use a UI design tool to layout your display etc for your application, compile and download to the display and away you go. All touch events are handled by the display, all you need to worry about it sending it the right commands and dealing with the responses. My Friend has posted a few examples already , here is an excellent one http://tech.scargill.net/coding-the-nextion/

     

    Hope this helps

     

    Peter