Here are my simple project,dark on relay with flasher to be a reference to anybody.

[chelah]

OBJECTIVE

 

To design the circuit as its function by using LDR dark sensor.

To know the real operation of circuit that using LDR.

This project for practical lesson after studying about LDR.

To design the model for Lighting in the dark room

 

INTRODUCTION

This project name as Dark On Relay With LED Flasher which is operated in dark condition only.It built for home and office user to simplified their daily routine.For purpose this project is to illuminate at lamp and fan switch with it layout.The function of LDR is act as light or dark sensor.

LIST OF MATERIAL

 

Material		Quantities
IC NE555		1
Transistor NPN C9013		3
Light Dependent Resistor (LDR)		1
Diode 1N4148		1
Relay 9V		1
Potentiometer 20K?		1
High Intensity White LED		9
Resistor,	10K?	3
	1.2K?	2
	470?	1
	270?	2
Capacitor	0.1µF (ceramic)	1
	1µF (Electrolytic)	1
	47µF (Electrolytic)	2
LED green		1
DC jack female type		1
Stripboard		1
Solder iron		1
Lead		100cm
Longnose pliers,cutter		1
Perspeks		1(80mm×450mm)
Mountingboard
Adhesive		1
L hanger		2

 

OPERATION AND ITS FUNCTION

 

 

Operation of this circuit is when the L.D.R detects darks it will decrease the LDR resistance. Then it will give supply to relay, after that the relay activated the flashing LEDs, then the circuit is in ON condition.

Therefore LDR is acts as a switch to activated the circuit meanwhile relay acts as secondary switch that control the secondary cicuit whereas the flashing LEDs circuit.

When LDR detects light automatically the resistance of the LDR becomes higher, then the current cannot flow through the LDR automatically the circuit is in OFF condition.

FULL SCHEMATIC DIAGRAM

-      When choosing the LDR for circuit,LDR must be can operate  in dark and light condition.

-      In this circuit,LDR is connected to pin trigger,when in dark condition,it will turn ON the LED.

-      This circuit is combine with Flasher circuit to make LED illuminate sequence with speed adjustable

-      We use relay in this circuit for switching to avoid low power to LED flasher.

-      Potentiometer is use to make a sensitivity adjustment, when resistance is low,dark sensitivity will increase and when resistance is high,dark sensitivity will decrease.

 

 

 

 

 

SUMMARY.

The summary is to invention a new generation of light with no switch to control a very awesome light by the way in the same time the light has its own function. It can be used in very dark area such as stairs, in a room, storage chamber and many more.

Furthermore the cost to this invention is also affordable and also give a lower maintenance.

 

 

 

[Anonymous]

thank you sharing this.. Its useful 

[Author]

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