This project adds a hardware microphone mute feature to the Amazon Echo Dot. This adds an extra layer of security against microphone attacks (i.e. DolphinAttack and sound-mod lasers). It uses a Seeeduino Xiao microcontroller that is is contained inside the Echo Dot 2nd gen smart speaker, which it also uses for power, triggering, and indications. I hope this will inspire other types of modifications for the DIY security community, and is especially valuable to those who distrust companies like Amazon or Google with the surveilling or handling of their personal information.
All details can be found in the linked YouTube video.
Tiny Arduino-style microcontroller using SAM D21 microprocessor
Wiring and soldering tools
30GA stranded wiring. Solder, rosin flux, super glue, soldering tools. I used a nice silicone soldering/ESD mat which resists temperatures higher than my soldering iron, too.