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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:
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.
LM324 is a 14pin IC consisting of four independent operational amplifiers (op-amps) compensated in a single package. Op-amps are...
An LDR (Light dependent resistor), as its name suggests, offers resistance in response to the ambient light. The resistance decreases as the intensity of incident light increases, and vice versa. In the absence of light, LDR exhibits a resistance of the order of mega-ohms which decreases to few...
Resistor is a passive component used to control current in a circuit. Its resistance is given by the ratio of voltage applied across its terminals to the current passing through it. Thus a particular value of resistor, for fixed voltage, limits the current through it. They are omnipresent in...
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