Button

it will be able to sense modern and will light up and make sound based on it

Go to maker case.com and copy the dimensions to what is shown in photo then cut holes for sensors and then cut

Grab your ultrasonic sensor and plug in wires as shown and then grab the argrino and plug in wires

Tape the sensors into the holes and then wire them into the argino as shown

once connected use it and test Wirth computer too see if lights up

Put the mini bred bored in and plug iun wires as shown in photo after plugging in and then wire it to all of the other ones in the box