Any of three functions can be called simply by making the pin low of the sensor or pressing on board three switches. The response is either error or ok which is indicated by on board LED. The response is also returned as single serial data byte. The return byte is a valid ID or error code. The response byte is a single byte at 9600 bps thus making whole sensor very easy to use. You can also use the parallel output instead of using serial programming that doesn’t require any serial interfacing code. We have provided indicating LEDs and function switch already so it’s ready to use when you receive it. Just give power and start using the sensor using on board switches. Then you can move on making external application using these functions.