Arduino Tutorial #4 - LCD displays, Libraries and Troubleshooting

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A tutorial on interfacing LCDs (liquid crystal displays) with Arduino. We take a look at libraries and the role they play...and the potential issues, errors and troubleshooting involved.
We look at several types of displays but concentrate on the 4x20 Sparkfun serial enabled LCD display.

SparkFun kit from my Amazon Store:

A link to the SparkSoftLCD library for the Arduino by C. A. Church - fixes issue with float variables on serial enabled LCD displays:

Link to new Arduino software / IDE 1.0.5:

Link to the LiquidCrystal library with examples and wiring:

Link to the SparkFun SerLCD 2.5 datasheet:

Link to the Hitachi HD44780U dot-matrix liquid crystal display controller datasheet:

SparkFun LCD displays:

How to install Arduino libraries / Installing Additional Arduino Libraries:

How to create a library for Arduino / Writing a Library for Arduino:

Troubleshooting compiling errors:
error: WConstants.h: No such file or directory
error: Wires.h: No such file or directory
Change / point library to Arduino.h
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