HELP: 16 X 2 lcd interfacing not woking with at89c52

Discussion in 'Embedded Systems and Microcontrollers' started by lamhey, Apr 23, 2011.

  1. lamhey

    Thread Starter New Member

    Apr 23, 2011
    2
    0
    hi,

    i am a newbie in this forum, as well as in electronics project. i have been working in a digi-lock project, the source of which has been taken from http://www.engineersgarage.com/micr...code-lock-with-password-using-at89c51-circuit.

    i am using at89c52 microcontroller. the problem im facing here is I can't make the lcd display working. ive tried with the simplest ones, but nothing is showing in the lcd.

    Supply in the microcontroller seems above 5 volt without joining the lcd, but below 5 volt while joining the lcd. im wondering if the voltage drop is causing for the problem with the lcd?

    im really confused and disappointed already.

    pls help me....plssssssssssss
     
  2. jt6245

    Member

    Feb 18, 2011
    21
    3
    I would recommend double check the pinout of your lcd module with the datasheet,and sure the connection is right. Pay more attention on pin order and contrast pin requirement.
    if lcd module's back light is turned on ,voltage may or may not change a little bit according to your power supply quality.
     
    lamhey likes this.
  3. THE_RB

    AAC Fanatic!

    Feb 11, 2008
    5,435
    1,305
    Check the contrast voltage trimpot adjustment!
     
    lamhey likes this.
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