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I have a generic 16x2 LCD display connected to my Arduino. I can use the standard LCD library to display characters, but are there way to turn on and of individual pixels?

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It's possible to define custom characters for “generic 16x2 LCD displays” [ie, displays based on HD44780 or equivalent controllers], but only up to eight such characters at the same time. See LiquidCrystal.CreateChar for details. See page 2 and part of page 1 of the Print degree symbol ° on LCD arduino.cc thread for create-character examples that don't use the library. Page 1 of that thread also shows a table of all the characters built into typical HD44780 controllers, some of which may perhaps meet your needs.

For pixel-by-pixel LCD control, look at graphics LCDs, eg the KS0108 or LCD12864 and similar.

  • I am attempting to make a bar graph, so the 'CreateChar' function is great, but I wish I had more than 8 characters (20 would be ideal.) Still, this might be the way to go. \Unfortunately, none of the predefined characters works well for bar graphs. – Hoytman Oct 31 '15 at 4:18
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    I don't see why you'd need 20 different symbols for a simple bar graph. You can only have 5 different widths (horizontal bar), or 8 different height (vertical bar). Just do a google image search to see some examples. – Gerben Oct 31 '15 at 14:28

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