HARDWARE
PROTOTYPE
28
AEIE, RCCIIT
Light Dependent Resistor
The conundrum of light dependent resistor and photoresistor is used in a supplementary and in a
complementary manner inter alia in a synonymous form. By being the light-sensitive devices, it’s
an embodiment of resistivity which is the function of incident electromagnetic radiation.
Photoconductors and photoconductive cells or simple photocells are some of the names by which
such devices are also designated. Constituted out of semiconductor materials, these devices are
substantiated with high resistance. Symbolic balkanization is the means to indicate the LDR, one
of the most commonly used symbol is shown in the figure below. The arrow indicates light falling
on it.
Figure 4.2: Symbol of LDR
4.1.2 The Controlling Circuit
The controlling circuit is designed with a microcontroller. The microcontroller is inscribed with
some algorithm to compare and detect the direction of light intensities being maximum. The
microcontroller uses the inputs from the photo sensors and then forwards the results after
computation to the driving module. The microcontroller we use in
our design is NodeMcu, which
is an IoT based platform.
HARDWARE PROTOTYPE
29
AEIE, RCCIIT
Figure 4.3: Circuit Diagram
Current Sensor
A proportional signal is produced, when the current sensor sense electricity flowing through the
wire. The proportional signal that is being produced can be either of the three types, i.e. analog
voltage, current or digital output. The initiator signal can be further utilized for the measurement
of current, by an ammeter. It can also be stored for future assessments in the field of data
acquisition or can be implemented for controlling purposes.
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