This is a small project to read wav files from a micro SD card via an Arduino Nano and then play them directly to a loudspeaker. I’ll state upfront that this isn’t the easiest way to do this (there are MP3 modules and libraries), but I wanted to:
- Understand sound generation using a microcontroller from first principles
- Have some tools / ideas about how to generate sounds for any future projects
As an idea of the sort of thing I was thinking of - I’ve been thinking of a DIY “ring” doorbell. I already have a camera that can see anyone approaching the front door. A 433.92MHz receiver could detect when the doorbell is pressed (so no new doorbell required). A Raspberry Pi (i.e. the one with the camera) controlling it all and sending and receiving to my mobile phone. A lot more work than just buying a Ring doorbell - but a lot more satisfying!