Bluetooth on the R pi side with the Python Bluetooth serial module with Ofcom protocol and a board of 96. If, if the ear is the threshold set and if the counter frames then the character E or the Y is sent via that function to the Arduino, it is the sets up the Bluetooth board rates, queries the modules role. And if the Bluetooth module uh detects an E or A Y from the large Pi then the buzzer is sounded.