Automatic Curtain Operation Using LDR

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We have witnessed a rapid inclination towards automation lately. Considering some of the factors such as time consumption, affordability, feasibility and convenience, automation has enhanced our standards of living in numerous ways. Abiding by this notion, we are presenting an Automatic curtain opener model using LDR. It does the task of folding and unfolding of the curtain as per the light intensity outside the window. It is an automatic process and the light intensity is sensed by LDR in the circuit.

Component Name Value Quantity
555 Timer IC 2
Transistor Q1BC547 2
DC Motor 12V 1
Resistor 330 ohm 1
470 ohm 1
1K 1
100K 1
Power supply (Battery) 9-12 V 1
Capacitor 820nF 2
0.01uF 2
2 channel Relay Module 1
LEDs Green 2

Light Dependent Resistor (LDR):

An LDR is a light sensitive electronic component. The resistance changes with the intensity of light incident on it. Values of the resistance of the LDR ranges over many orders of magnitude. The value of the resistance falls as the level of light increases.

555 timer IC:

The 555 timer IC is a precision timing device which can act as either a simple timer to generate single pulses or long time delays, or as a relaxation oscillator producing a string of stabilized waveforms of varying duty cycles from 50 to 100%. The basic 555 timer gets its name from the fact that there are three internally connected 5kΩ resistors which it uses to generate the