Project 4: Noisy Cricket
As a means to explore the uses of the Arduino’s digital pins and to discuss the different digital functions, we are going to look at a new project: the Noisy Cricket. This project will make quite an annoying racket when left alone, but it will quickly hush up when someone gets near it—just like a real cricket. We will use a simple and inexpensive motion sensor as a trigger, although a tilt switch, mat switch, or any other simple on or off sensor will do. Wire the whole thing up and power it from a battery, then go find a hard-to-reach place for the cricket to call home and see how many people you can drive insane with it!
Hooking It Up
This circuit can be as simple or complex as you want to make it. We will go with the ...