Hardware Reference
In-Depth Information
Figure 1.7
displays the schematic circuitry of the IR sensor (Break-Beam Sensor).
Notice that when circuit in
Figure 1.7
is energized, the
NO
terminal of the circuit is raised
to 5 VDC. And when the IR ray is broken by presence of a car in front of the parking en-
trance arm gate, relay is activated (NC = 1 or 5 VDC) and that is the time when the micro-
controller is notified that a car at the entrance wants to get in. Electronic components are
soldered to a printed circuit board to create the
IR sensor PCB
shown in
Figure 1.8
.
Figure 1.7
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