Fritzing

Temperature display that let's a user flip between Celsius and Ferinheight 

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  I've built this with the Uno Starter Kit, which comes with an LM35 thermal sensor, as well as a 4 digit 7 segment display.

  It uses 220Ω resistors in line with the LEDs in the dispaly, and a 10kΩ resistor between the button's output pin and ground (forcing current to flow to input on the board when the button is depressed, yet allowing the off state to be at ground).

 

  The code for this project can be found here: https://bitbucket.org/rsparkyc/tempsensor