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Distance Proximity Sensor
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1.3 AIM AND OBJECTIVE OF THE PROJECT
The
aim and objective of this project is to highlight and construct a
distance proximity sensor using Light Dependent Resistor (L.D.R).
Proximity sensors have been constructed in many different ways but this
Light dependent resistors type is more sensitive than inductive and
capacitive sensors which are rarely used in circuit designs. This is
because it is a photocell that works on the principle of
photoconductivity whose resistance value decreases when light intensity
of light decreases. Light dependent resistors are also called
optoelectronic devices when exposed to source of light with high
intensity will automatically lights up the light emitting diodes.
1.4 SCOPE OF THE PROJECT
Proximity
sensors comes in various design voltages and ohms the choice of a
particular sensor then depends on its function either for construction
of automatic street light circuit, simple fire alarm circuit, light
activated circuit,, automated LED emergency light and night security
light. The project tends to cover the design of distance sensor using
light dependent resistors and LED to indicated obstacles at close
proximity to the device.
1.5 LIMITATION OF THE STUDY
The project
work deals on the construction of proximity sensor for light meters
thus the limitation of study could be likened to financial constraint,
time consumption and difficulties encountered while getting materials
for the design.
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