LED Sound Meter

In this guide you will learn to created an array of LEDs that visually represent the volume picked up by an electret microphone. You will learn how to wire 3 different circuits which are the LED array (which is really many individual circuits), the microphone, and a button which can be used... Read more »

Using the MakerShield – Button

The MakerShield is a great prototyping shield but the button can be a little confusing to use. Since it connects to ground when pressed, it takes a little extra wiring and one change in the code to get to work with with the Arduino example sketch. Follow along! Read more »

Audio Spectrum Analyzer

As complicated as I thought this would be, this circuit is using the basic fundamentals of electronics and algebra. The only hard part is perfecting it and expanding it. Click here to see the finished project. Read more »

The Truth Meter

By Sean M. Montgomery and Ira M. Laefsky Excerpted from a Primer on Biosensing in MAKE Volume 26. When you experience an arousing stimulus, like an evocative question, a startling noise, or even a disturbing thought, your body generates a variety of psychophysical responses. One of these is micro-pulses of... Read more »