The microphone array used in this project is the 6+1 microphone array from Sipeed. It has a total of 7 MEMS microphones mounted at the vertices and center of a hexagon, with 3 microphones arranged along each of the 3 axes.

There are 10 pins on the back of the array for data transmission and reception.
In addition, there are 12 NeoPixel LEDs mounted around the perimeter of the PCB, which can be used to display the direction of the sound source using only the PCB.