10.5. Summary
In this chapter we've looked at how you can build an effective front panel using buttons, LEDs, and small, text-only LCDs. We saw that scanning a keypad or LED array can reduce the number of I/O lines you need, and that movement, such as a blinking LED, can draw the eye and let the user know that the appliance is running. We also noted that how well your appliance is accepted may depend on how quickly you make user interaction possible and how easily users can navigate your menu system.
We reviewed Laddie's front panel design, including its menu system, hardware, UI software, and various front panel emulators. Our hardware design includes an HD44780 display and a 2-by-2 keypad. The source for our 2.6 character device driver, lad_pad, ...
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