We all are familiar with light dependent resistor (LDR) which is widely used in many applications like cars, street lights etc. Many ways are there by which we can interface light dependent resistors. Here, we will see a simple circuit for interfacing light dependent resistors using ULN2803 chip. ULN2803 is a high voltage / high current darlington driver comprised of eight NPN darlington pairs.
Video demonstration of working of a light dependent resistor using ULN2803 is given below.
By making proper changes in circuit, we can reverse the working of circuit.
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