Chapter 2. Creating a Spy Microphone

In this chapter, we are going to build a very useful device for any secret agent: a spy microphone. The project will be based on Arduino, with a simple amplified microphone and an SD card.

The following are the steps that we are going to take to build this project:

• We will see how to configure the project in order to make sure that it is recording for a given amount of time that can be configured by the user
• Then, the recorded audio file will be written on the SD card and be accessible from any computer
• Before doing that, we will test all the components of the project individually

Let's dive in!