CHAPTER 8

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LCDs and the Arduino

Making machines talk to humans is quite easy using light indicators or other illumination devices. The most common way of providing information is through a visible light source. By establishing a protocol (set of rules), a messaging scheme is created based on the application definition.

Incandescent lightbulbs were once the component of choice for visual indicators because of their ability to alert someone of a change in a process or the approaching of a dangerous threshold. LEDs improved on the incandescent lightbulb because of low thermals (heat), small size, and greater longevity.

With the arrangement of seven ...

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