User manual

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Figure 3.22 : Relay Circuit used in Project
v. Liquid Crystal Display (LCD)
A 16x2 liquid crystal display is used to display the total occupant inside the
laboratory. This LCD also display either a visitor is enter or exit the room. It can be
observed when occupant is entering; an output shows “In” and along with the
increment of counter. Same goes if when occupant is leaving, LCD will display
“Out” in a line with the decrement of the counter. Height of occupant detect by
sensor 3 also displayed as output. The first line of LCD displays the total occupant
inside the laboratory while the second line displays the height of occupant as they
pass through the entrance.
a) b)
Figure 3.23 : a) LCD 16x2 b) LCD shows Occupant In