User manual

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3. If someone walks in right behind the other person.
Unless both of the occupants are literally holding on to each other with no space
between them torsos, the beams will be restored as soon as the first person
passes. Before the next person can walk in order to prevent baggy clothing from
setting off the sensor, a very small time threshold must be met for both beams to
be clear. A microcontroller takes a few second to run the program before it
executes to the next stage.
4. When two person walking side-by-side.
This is a minor problem as the laboratory door is around 3ft wide. There is no
way a visitor will hardly enter such small area by walking side by side. One
should be in first while the other has to wait because with a limited size of the
door, they need to pass one by one.
5. Someone waves their hand over the sensor to run up the count.
They have to do it slow enough for both beams to be broken for the minimum
amount of time specified according to the programming. This could happen so in
this problem, occupant must be discipline enough not to do so.
6. Setting of the buzzer.
A buzzer had been setup to discipline the person who enters the laboratory. For
this simple counter, the programming is design with a few assumptions. When a
person stand at the door and either sensor 1 or sensor 2 detect the presence, the
buzzer will beep. Same goes if a person stand there and both sensor detect a
presence, the buzzer will sound.