Audio Alert using a DFPlayer module

Audio Alert using a DFPlayer module

For a PCB SMT version see https://www.thingiverse.com/thing:3102114 or https://www.instructables.com/id/Audio-Alert/

https://youtu.be/I41c7qiyuZw

This Audio Alert box is placed between an audio source and an audio consumer such as an FM transmitter or amplifier. When the alert box wirelessly receives an encoded message, it breaks into the audio stream from the source and plays an mp3 sound clip. I designed the Audio Alert box for a project I recently published that detects when a wood shop dust collector is full. The original detector design would flash a warning light when the collector is full. The updated design, in addition to the flashing, now broadcasts an encoded message that is picked up by the Audio Alert box that plays an mp3 sound clip that I hear on my FM hearing protector headset. The number of messages that the Audio alert box can play/insert into the audio stream, is only limited by the number of mp3 files you can fit on