Originally posted by micro@May 3 2006, 08:29 PM
I just brought a HD44780 16x2 hitachi LCD. I have connected it to
my PIC16f877 but there was only black boxes display on my LCD screen
and no word on the screen. May I know how to test my LCD to make sure
it is still function? Thanks.
Do you have multiple voltages connected to the display, or only a positive Vdd and Ground? There should be a total of three connections to the contrast adjustment potentiometer, and you need to refer to the datasheet. As you turn the potentiometer the voltage on the contrast adjust pin will be between the voltages on either end of the potentiometer. Use a voltmeter and confirm that you can put the contrast adjust pin between the supply rails. The value of the potentiometer is also important. Again, please check the datasheet.Originally posted by micro@May 4 2006, 05:08 AM
Thanks, Papabravo. I do have a contrast adjustment between the supply rail on my LCD display. I have adjusted it but only can see the black boxes on my screen, may I know how do solve this problem? Thanks.
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