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.
Filed Under: Electronic Projects