User manual

20
2.3 Related Work
i. Street Light
Switch the lights on and off automatically during night and day time respectively.
This system used Light Dependent Resistor (LDR). The resistance changes according
to the amount of light falling on it. The system is said to reduce energy consumption
and CO2 emissions by up to 80 percent, plus it lowers maintenance costs and reduces
light pollution [11].
ii. Motion Detector Lighting Control System
This system use motion detection to control lighting system. It consists of active
or passive sensor. However, this system has delay and depends on motion to
function. The weakness is if occupant is sleeping and static, the lighting system is
turn off.
iii. Bidirectional Visitor Counter
Two IR transmitter-receiver pairs are used at the passage. Microcontroller
controls counting and displays the number of persons present inside the hall. This
counter can change its state in either direction, under control of an up–down selector
input known as an up-down counter. It can count numbers from 0 to 9999 in up and
down modes depending upon the state of the selector. It also can be used to count the
number of persons entering a hall in the up mode at entrance gate. While in the down
mode, it can count the number of persons leaving the hall by decrementing the count
at exit gate [8].