So for my first project, I want to create something that plays various theme songs every time a door is opened. For the sensor, I have a reed switch that is fully functional. For the songs, I have an MP3 Module which takes in MicroSD and loads the file.
However, how do I add a speaker to this set up? Is there a limit on how loud the speaker can be? Is there a way to use any speaker that I want?
I've been told about a "amplifier"? What is that in terms of product?