LiquidCrystal lets you use small character type displays. Characters and a limited set of custom symbols can be used. http://www.pjrc.com/teensy/td_libs_LiquidCrystal.html -- LiquidCrystalFast can use the R/W pin for faster access. Either way can update the display faster than a human eye can detect, but if your project needs to do other work, less time updating the display may be worth using a seventh pin.
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