Materials: 1. Cheap Digital Thermometer 2. Arduino 3. RGB LED 4. Resistor (for RGB LED to not burn out) 5. 9v Battery (or another power source for the arduino)
Taking a digital thermometer from a convenience store (CVS), we extracted the metal and two wires used to read your temperature when sick.
To do this we used a dremel (or any other small drill) to carefully take apart the tip of the thermometer from the body. Be careful as the wires are very thin and small.
(All images are available to download / or see at full size at the bottom of this page.)
Next we took the thermometer part and soldered each end to a thicker hookup wire. We taped down the thermometer and thin wire to a piece of cardboard to give it more structure (so that the wires would not fall apart on us). Using any sturdy material will do for this.
Here are general images of the wiring we did, hooking it up to an Arduino UNO. See the code (below & in the attachment "fishing.zip") for which pin = which connection.
The arduino code is from a few different sources (see below for our compilation): Reading the thermistor, simple code: http://arduino.cc/playground/ComponentLib/Thermistor2
Arduino RGB LED HSV "Color Wheel" http://eduardofv.com/read_post/179-Arduino-RGB-LED-HSV-Color-Wheel-