Cup Cooler using an Arduino

This is my first Instructable, so please judge harshly so that I can learn :) Its a simple project minimal skills needed. Drawings are made using: Fritzing Code Written using Codebender The cold plate got to -20c Watter in the cup measured @ 5.5c compared to icecube @2.5c   Step 2: Wiring everything Optocoupler 4N33 Pin1 -  Digital I/O 9 via 220Ohm resistor Pin2 - Ground Pin4 - DC fan Positive Pin5 - 1 ...

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