EEVblog #248 – LCD Enabled Microcontroller SelectionPosted on February 29th, 2012 7 comments
Look over Dave’s shoulder as he tries to select a 7 segment LCD and suitable driving microcontroller.
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Well made tutorial, Dave!
If the lcd you want to use doesn’t need complicated driving waveforms (with 1/3 bias or so), there’s no necessity for a -maybe- more expensive microcontroller with lcd driving capability. A close look at the lcd’s data sheet may point that out.
Some links i found about driving a lcd with GPIO pins:
AVR340 appnote: http://www.atmel.com/Images/doc8103.pdf
AVR241 appnote: http://www.atmel.com/Images/doc2569.pdf
PIC example: http://mcs.uwsuper.edu/sb/Electronics/TempLCD/
You probably don’t need the various bias voltage levels with that simple LCD so most of the VLCD pins can be used as ADC.
This might make the 40 pin work.
You can’t usually “disable” segments in a multiplexed LCD. They still need to be driven otherwise they will pick up charge and start showing through. It is much easier with non-multiplexed LCDs where you can connect unused segments to [a single] COM.
Leo Bodnar: You only need one segment pin extra that you connect all unnused segments to.
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