Can anyone help me out to do this project as in the video? In this project, TOF laser sensor can accurately know the direction and number of people on both sides of the stairs through the algorithm. This will allow you to calculate the number of people on the stairs and also know the direction of the first person to enter (and the last to leave).
Get a bunch of beam break sensors and some LEDs and an arduino.
With 2 beam break sensors next to each other direction is determined by which beam broke first.
You can use two sets of IR break beam sensors, one pair at the top and the other pair at the bottom. By checking beam order you can determine how many are on the stairs and what direction they are going. Example set at bottom, #1 sensor on first step, second sensor on #2 step. If the pattern is 1-2 somebody is going up. if it is 2-1 they are coming down. With the set on the top and bottom you can keep track of how many are on the steps, As PaukKD7HB suggests
You might even be able to determine when someone changes their direction and exits the same way the entered.
Here's one person's approach:
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