Test your radar detector or laser jammer with this traffic enforcement LIDAR gun simulator

Step 4 Schematic push button

Next we wire in your push button, one lead goes to ground, and the other lead goes to arduino digital input pin 11.  The 10Kohm resistor is necessary so stray signals don't accidentally fire on pin 11 so attach the resistor to 5 volts.  If you haven't guess it yet, but the push button is the trigger button to activate your simulated LIDAR gun.