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Thread: Beginner question about the lcd

  1. #1
    Junior Member
    Join Date
    Aug 2020

    Beginner question about the lcd

    Hello there and thanks in advance for answering .

    I am currently trying to connect a 20*4 LCD to a Teensy 3.2, but it does not work. I have connected it like this:
    Vss-> ground
    VDD-> power (3.3V)
    V0->middle pin of the potmeter
    RS-> pin 10
    RW-> ground
    E->pin 9
    D4->pin 5
    D6->pin 3
    D7->pin 2

    When I do this, it only lights up and that is all. I cannot change the brightness with the potmeter and I also can't programm any text on it. Does anybody know what is going wrong? Maybe the lcd only works on an aruino (that is 5V)? I hope that anybody can help me out.


  2. #2
    Senior Member PaulS's Avatar
    Join Date
    Apr 2015
    Hi Joris,
    We need little bit more info in order to help you.
    Could you post the sketch you are using? What exact display are you using? [see also the Forum Rule on top of this page...]
    BTW: you can not adjust the backlight with that potmeter; the potmeter is there to adjust the contrast/viewing angle of the LCD display.


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