This is one of the common
circuit blocks being used both in digital and analog electronics. Its
output is dependent on the relationship of its two input pins. One of
the inputs is set to give the reference voltage while the other one is
commonly connected to different sensors. If the reference voltage was
overcome by the input connected to the sensor, the output of the
comparator changes.
In this circuit, the we'll use an LDR.
The
advantage of a comparator IC than an opamp used as an comparator is the
property of IC comparators to be open collector output. Having this
feature, we can set the output of the comparator beyond its biased
voltage.
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