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Numeric Keypad Demonstration

This is a simple implementation of a numeric keypad for use with circuits requiring number inputs, such as GPS targetting.

In this example, the input is simply shown on the screen, and the user is prevented from entering a number larger than the screen can display. The NEG button will toggle to negative values and the DEL button deletes the current input

TODO:

- Backspace function
- Better negation mechanic
- Decimal place