Let's face it. There are some people out there who have been blessed with a voice that is just a little too powerful at times. We all know it is rude to blatantly ask a person to "shut up." Unfortunately, there are times when the favor must be asked, which can sometimes lead to an uncomfortable situation. What is my solution to this problem? Give this device to that person as a gift, have them pin it on, and let the machine do the talking! It will sound an alarm when the user reaches a talking level unsuitable for indoor use. This tutorial will show you how to go about creating this tool.
Most local electronics/hobbies stores (Radioshack, etc.) will have all the supplies on hand except for the Arduino Uno and 9V battery component, and the electret mic. These can be ordered online, however. Just check out the links.