In this case I'm using the transistors as a switch. Transistors are mainly used to amplify things or as switches. If anyone has any advice I'd be happy to hear it and incorporate it. This is the first project I've ever designed with transistors, so I may be missing some caps and diodes somewhere. NOTE: I'm pretty new to all this stuff, so there's no guarantee I'm doing things right. Hopefully these can be usefull to others in their projects. Besides what the project actually does, it also gives instructions on converting text to a wav file and transfering files to the SD card on the Arduino over Serial. Anyway, most of you probably don't have that problem (wish I didn't). You could go further by connecting a photo resistor to detect when your cell phone is ringing (the screen lights up), or a Parallax CH4 sensor so you can get an early warning of raising methane levels in your cubicle because your cubicle mate had too much cabbage at lunch. For example, mine's connected to a Parallax Ping ultrasonic range finder, microphone, doorbell button, and computer (alerts on a new email). You can then connect the Arduino to whatever type of sensor you like. Basically this uses 6 transistors to switch between a sound source (in my case an iPod) and Ladyada's Wave shield letting you know what's going on. To solve these problems I invented the Arduino based Sound Switcher. Even worse, have you ever wanted to sleep at work, but didn't have a good way to wake up if someone (like your boss) was about to come into your cubicle. Have you ever had your music cranked up at work and didn't realize someone was trying to talk to you.
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