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Thread: Highly optimized ILI9341 (320x240 TFT color display) library

  1. #601
    Junior Member
    Join Date
    Aug 2020
    Posts
    2
    Hello,

    A relative newbie here trying to get a "hello world" TFT example working, without much luck.

    I have a ILI9341 2.8" display that I'm trying to get working on my Teensy 4.1 with Arduino IDE 1.8.11. I'm using the unmodified code from here with the graphicstest example: https://github.com/PaulStoffregen/ILI9341_t3

    I've tried various wiring combinations, it's not completely clear to me which pins should go where, but at the moment I have:

    VCC -> The 3.3 next to 23, have also tried Vin and others
    GND -> The GND next to 3.3 (I'm unclear if it matters which one)
    CS -> 10
    RESET -> On/Off (assuming it's the same position as on the 4.0 as it's unlabelled in the 4.1 pinout)
    DC -> 9
    MOSI -> 11
    SCK -> 13
    LED disconnected, I'm unclear if this is needed or where it should go
    MISO -> 12
    T_* all disconnected

    Result: the screen doesn't turn on. I can see the benchmarking output in the serial monitor so the code is definitely compiling, uploading and executing. I've had the screen working before on an Arduino.

    I'm sure I'm missing something simple but could someone offer a clue?

    Many thanks

  2. #602
    Junior Member
    Join Date
    Jul 2015
    Posts
    17
    Definitely need LED connected - it's what turns on the backlight. That goes to 5V.
    Other connections can be found here:

    https://www.pjrc.com/store/display_ili9341_touch.html

  3. #603
    Junior Member
    Join Date
    Aug 2020
    Posts
    2
    Quote Originally Posted by dbbones View Post
    Definitely need LED connected - it's what turns on the backlight. That goes to 5V.
    Other connections can be found here:

    https://www.pjrc.com/store/display_ili9341_touch.html
    Thanks got it working

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