Summary
In this chapter, you learned how to build a spy microphone based on a simple amplified microphone, Arduino, and a microSD card. The spy microphone can be set up to record audio continuously for a given amount of time.
Of course, there are many things that you can now do in order to improve this project. You can, for example, use a battery to power the project to make it autonomous. Then, you just need to place it in a room in which you want to record a conversation and just come back later to retrieve the SD card with the recording.
You can also connect a motion sensor to the project and use that to automatically start a recording when motion is detected in a room in order to intercept conversations with total discretion.
Another interesting ...
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