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Color Detection Using LDR | Sensor Using LDR | Sensors theory of working | Light Sensors | Street Light Project
LDR SENSOR FOR COLOR DETECTION
summary:-
This
circuit can be used to sense and differentiate between different
colors. This project demonstrates the principle and operation of a
simple color sensor using LDR.
The circuit is divided into three parts: Detector (LDR), Comparator and
Output. This circuit is based on LM324 IC whose pin diagram has been
shown below:
Circuit diagram:-
Component:-
- Resistor
- LED
- LDR
- Preset
- IC LM324
In this project, when light of a particular color falls on LDR, its resistance decreases
and an output voltage is produced. This voltage is dependent on the
intensity and wavelength of different color. For this we need to set
reference voltage of comparator according to our requirement.
For
Eg., If we set reference voltage at positive pin with 0.38volts, the
LDR becomes sensitive to blue light. When blue light falls on the LED, an output of approximate voltage 0.28V is produced, this glows the output LED.But
if we use a yellow color light on LDR then input voltage at the
comparator is around 0.7 volts at the negative pin of comparator and the
output LED doesn’t glow.
Electronics Projects Circuits Created By Muhammad Irfan
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