All you’ll need in addition to the Arduino (or really, any modern microcontroller) is the sound sensor — which are often sold as “microphone shields.” To trigger the flash while still ...

The attached shield—dubbed the “Ambient Board”—is a buffet of sensors: temperature, humidity, CO, NO2, light intensity, and a microphone for reading sound levels.

The MozziByte add-on board has been created to easily install an extra 3.5mm audio amp, jack and speaker output to the Arduino Pro Mini development board.