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Saturday, December 30, 2023

on video How to Create LDR Dakness Sensor Circuit Using NE358 IC

How to Create LDR Dakness Sensor Circuit Using NE358 IC

This sensor detects light falling on it and changes its resistance accordingly. This change in resistance of LDR detected by a circuit. Which turn LED ON When light is not falling on LDR and turn LED OFF when light falling on LDR

LDR is a photoresistor is a light-controlled variable resistor.


The resistance of a photoresistor decreases with increasing incident light intensity,


In other words, it exhibits photoconductivity.


A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.


A photoresistor is made of a high resistance semiconductor.


In the dark, a photoresistor can have a resistance as high as several megohms (MΩ),


While in the light, a photoresistor can have a resistance as low as a few hundred ohms.


BC547 is an NPN bi-polar junction transistor. A transistor, stands for transfer of resistance, is commonly used to amplify current. A small current at its base controls a larger current at collector & emitter terminals.


BC547 is mainly used for amplification and switching purposes. It has a maximum current gain of 800. Its equivalent transistors are BC548 and BC549. datasheet


50K ohm resistor one end is connected with Positive (9V) of battery and other end is connected in series with LDR and LDR another point is connected with negative of battery


here in video I have used 2 100Kohm resistor in parallel because I don't have a 50K one.


1K OHM resistor one end is connected with Positive (9V) of battery and other end is connected with anode (positive) of LED


Cathode (negative) of LED is Connected with C (collectr) of BC 547 Transistor


Emitter (E) of transistor is connected with the negative of battery


Base (B) is connected Junction point of the 50K resistor & LDR


It is a simple and powerful concept, which uses transistor (BC 547 NPN) as a switch to switch ON and OFF the LED LIGHT automatically.

It automatically switches ON lights when the light goes below the visible area of our eyes. (e.g. in the evening after sunset). it automatically switches OFF lights when light falls on it (e.g in morning), by using a sensor called LDR (Light Dependent Resistor) which senses

 

How to Create LDR Dakness Sensor Circuit Using NE358 IC

This sensor detects light falling on it and changes its resistance accordingly. This change in resistance of LDR detected by a circuit. Which turn LED ON When light is not falling on LDR and turn LED OFF when light falling on LDR

LDR is a photoresistor is a light-controlled variable resistor.


The resistance of a photoresistor decreases with increasing incident light intensity,


In other words, it exhibits photoconductivity.


A photoresistor can be applied in light-sensitive detector circuits, and light- and dark-activated switching circuits.


A photoresistor is made of a high resistance semiconductor.


In the dark, a photoresistor can have a resistance as high as several megohms (MΩ),


While in the light, a photoresistor can have a resistance as low as a few hundred ohms.


BC547 is an NPN bi-polar junction transistor. A transistor, stands for transfer of resistance, is commonly used to amplify current. A small current at its base controls a larger current at collector & emitter terminals.


BC547 is mainly used for amplification and switching purposes. It has a maximum current gain of 800. Its equivalent transistors are BC548 and BC549. datasheet


50K ohm resistor one end is connected with Positive (9V) of battery and other end is connected in series with LDR and LDR another point is connected with negative of battery


here in video I have used 2 100Kohm resistor in parallel because I don't have a 50K one.


1K OHM resistor one end is connected with Positive (9V) of battery and other end is connected with anode (positive) of LED


Cathode (negative) of LED is Connected with C (collectr) of BC 547 Transistor


Emitter (E) of transistor is connected with the negative of battery


Base (B) is connected Junction point of the 50K resistor & LDR


It is a simple and powerful concept, which uses transistor (BC 547 NPN) as a switch to switch ON and OFF the LED LIGHT automatically.

It automatically switches ON lights when the light goes below the visible area of our eyes. (e.g. in the evening after sunset). it automatically switches OFF lights when light falls on it (e.g in morning), by using a sensor called LDR (Light Dependent Resistor) which senses

 

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