Post by thread:[PIC] HD44780 LCD

I have come across a character LCD with an HD44780 controller, but I am not sure if it works on not. Is there an easy way to test it without wiring it up to a PIC and running some test code? Thanks _________________________________________________________________ The new MSN 8: advanced junk mail protection and 2 months FREE* http://join.msn.com/?page=features/junkmail -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

Apply power and ground (a current limited lab supply is best set for 20mA. Tough to burn stuff up at a low setting. If the display has backlight, it will take a lot more current - but the backlight is usually on a different set of pins.). Most of these displays will initialize the first row to all black characters and the second row to blank characters. This is a good first check. If you do not see anything, look for a contrast adjustment. Your display probably needs a contrast adjust. In which case, connect a 5k pot from the contrast pin to ground. In many cases, you can just short the pin to ground. But, your mileage may vary. ;-) What would be helpful is the model # for the display to really answer your question. cheers, eric At 8:28 PM -0700 2/7/03, Joe Smith wrote: {Quote hidden}>I have come across a character LCD with an HD44780 controller, but I am not >sure if it works on not. Is there an easy way to test it without wiring it >up to a PIC and running some test code? > >Thanks > >_________________________________________________________________ >The new MSN 8: advanced junk mail protection and 2 months FREE* >http://join.msn.com/?page=features/junkmail > >-- >http://www.piclist.com hint: The list server can filter out subtopics >(like ads or off topics) for you. See http://www.piclist.com/#topics -- -- http://www.piclist.com hint: The list server can filter out subtopics (like ads or off topics) for you. See http://www.piclist.com/#topics

On Fri, 7 Feb 2003, Joe Smith wrote: *>I have come across a character LCD with an HD44780 controller, but I am not *>sure if it works on not. Is there an easy way to test it without wiring it *>up to a PIC and running some test code? Connect 5V to Vdd gnd to Vss and gnd to Vlc, then turn on the psu. The first row (upper) of the display should be 'blacker' then the lower row, especially if you look at an angle. This would suggest that the controller is alive. I assume a two row display. Peter -- http://www.piclist.com hint: The PICList is archived three different ways. See http://www.piclist.com/#archives for details.