We won’t share today what a calculator is or what it does, we have all used one and certainly has been useful in many situations. We intend to do one with a TFT touchscreen and an Arduino, and we christened it: “Calcuino”. It incorporates all the basic functions:
Addition / subtraction / multiplication / division and RESET button and DELETE button.
2.8″ TFT Touch Shield for Arduino – 2.8″: Spice up your Arduino project with a beautiful large touchscreen display shield with built in microSD card connection. This TFT display is big (2.8″ diagonal) bright (4 white-LED backlight) and colorful (18-bit 262,000 different shades)! 240×320 pixels with individual pixel control. It has way more resolution than a black and white 128×64 display. As a bonus, this display has a resistive touchscreen attached to it already, so you can detect finger presses anywhere on the screen…. (read more)
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The touchable keypad code could work well for home-grown alarm systems for entering a pin number.