rPi touchscreen

[last updated: 2024-10-02]
raspberry Pi home page
GMC UI project
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From Newark Element 14 (link to:) Newark

• The touch screen comes with the screen, an "adapter board" and associated cables.
  
  
• The case must be ordered separately. Several versions are available online. Search google. I got mine from some unknown source through Amazon.
  Note: Assembling the rPi into the touch screen case was fairly easy, but getting it back out for whatever reason is tricky:
  Remove screws, then on screen side of assembly, insert fingernail between edge of touch screen and the case. Slide fingernail around until entire perimeter releases.
• The adapter board is attached to the back of the screen, and the rPi is mounted on top of the adapter board.
  
  
• The adapter board has a micro-USB slot for power. If a (recommended 2a) 5v supply is connected here, it will power the screen, adapter board, and the rPi.
  OTOH:In developing programs, when I'm repeatedly switching back and forth between a full-size HDMI monitor and the 7" touch screen, I have powered everything with the micro-USB on the rPi, letting the jumper between the rPi and the adapter supply power to the screen. It's worked without issue.
• If instead of using the touch screen, you want to connect the rPi to a larger monitor via the HDMI port, you must disconnect the touch screen, as you can't use both the touch screen and the HDMI output at the same time.
• Remove the red power jumper that connects power from the adapter board to the rPi. (the gnd jumper can remain)
  Apply power to the micro-USB power connector on the rPi board itself (above the micro-USB that powers the adapter board).
• For keyboard/mouse input, I use an IOGear 2.4 gHz wireless compact keyboard (IOG-GKM681R). It uses a dongle plugged into one of the rPi USB ports to communicate. The dongle is marked: QLERXGKM681R
• To rotate the display 180deg,
  enter: lcd_rotate=2
  into /boot/config.txt

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• Setup/Connections/Startup:
  • As noted, the screen comes with an "adapter board" attached.
  • The rPi is mounted above the adapter board on standoffs.
  • You must connect the rPi and the adapter board using a 15-pin "DSI" ribbon cable.
  • Connect power and ground jumpers from the rPi to the adapter board.
  • Insert micro-USB into power port on the adapter board.

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eof