This is the Wrist Light. It is uses a microphone connected to a miniature version of my Audio Sensor Board.
The envelope detector is connected to an Adafruit Trinket Pro Arduino which controls series of LED’s and vibrating motors. The lights and motors correspond to the amplitude of audio in the environment.
I designed the wristband in Sketchup. It is 3D printed with NinjaFlex filament. The Wrist Light was designed and built with the intention of adding visual and vibro-tactile sensing to audio signals for the hearing impaired.