Follow these instructions if the software doesn't seem to be responding when the people pedal. This step by-passes the software to see if the hardware is sending data to the computer.
Connect all the hardware together: the sensors connected to the interface board with ethernet cables, the programmed Arduino mounted on the interface board, and the Arduino connected to the computer with a USB cable.
Make sure the sensor blinks when the magnet passes by. If it doesn't that means the magnet is too far away from the sensor or it isn't facing the right way (AKA Polarity: North and South Poles). Fix that first.
Once the chosen terminal is configured as per the previous step, you should see a cursor with nothing going on. Type the letter 'g' on the keyboard. Nothing should happen for a few seconds (during the countdown - "4, 3, 2, 1, 0, go!"). Then you should see a stream of numbers and letters filling the screen.
This is an example of what you might see in the terminal at an instant:
1: 0 2: 0 3: 0 4: 0 t: 15311
Test the hardware by waving a magnet in front of the hall effect sensor. (Turn the magnet around until the tick LED flashes. That will be the correct orientation of the magnet.)
Every time you wave a magnet in front of the hall effect sensor you will see the number following the corresponding sensor increment. So if you caused a tick on sensor 2, the following report will look like this:
1: 0 2: 1 3: 0 4: 0 t: 15562
At this point, if all the sensors are behaving as expected, and if you were troubleshooting an issue -- the problem is with the software configuration.