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Thread: Can't get the RA8875 BuyDisplay Resistive touchscreen to work with Teensy3.2

  1. #1
    Junior Member
    Join Date
    Nov 2019
    Posts
    10

    Can't get the RA8875 BuyDisplay Resistive touchscreen to work with Teensy3.2

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    BuyDisplay ER TFTM050-3 with resistive touch connected to Teensy3.2 using MISO-MOSI-SCLK-CS
    BuyDisplay said I need to connect also INT pin for touchscreen to work, done.

    Tried with RA8875 library and examples by BuyDisplay as well with Sumotoy 0.79b11p10 RA8875 library/examples

    I can get all graphic examples working but no touchscreen ones

    Using Sumotoy's touchTest.ino i have random points appear in random times (later) when I tap touchscreen
    so I assume resistive pad is working (it has continuity from panel ribbon to RA8875 pins).

    I'm using 20cm stripline connection unshielded wires between Teensy and display

    Any suggestion please ?

  2. #2
    Junior Member
    Join Date
    Nov 2019
    Posts
    10
    My fault , I was counting Teensy INT pin not considering the first one is GND pin ( not 0 )

    I found system more stable using shorter connections anyway...

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