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I would like to have some sort of input device where a user can input a number between 0 and 99. I'm envisioning something similar to a thermostat, where the user pushes the up or down arrow button and an LCD displays the number.

Where can I start?

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    There are several options a button or two, a numeric keypad, or a rotary encoder. You could get fancy and pair it with a 2 digit seven segment display, or an hd44780 lcd display. This tutorial fritzing.org/projects/fritzing-minikit-counting-knob is designed for an arduino, but a Google search should turn up similar for the Pi. Jan 23 '15 at 21:57
  • Since the part that @SteveRobillard posted is for arduino, it shouldn't be a big poblem to convert it to Pi. You'll just need to do scripting handling the circuit and you can change the display to any 2 digit led (you may want to look for common '-' to connect it to GPIO). RPi.GPIO python lib has ways to control stuff through events, so coding should be easy. First code the switch impulse counting, then handling the display. Jan 25 '15 at 9:20

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