Ec Mini Project Report Sem 4

7/26/2019 Ec Mini Project Report Sem 4

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DEPARTMENT OF

ELECTRONICS AND COMMUNICATION ENGINEERING

Faculty of Engineering and Tecnology! SRM Uni"er#ity$

MINI PROJECT REPORT

EVEN Semester, 2016-17

Lab code Name ! EC101" # ELECTRONIC CIRC$ITS L%&'

(ear Semester ! II (ear, IV sem

Pro)ect T*t+e !

Lab Ser.*sor %

Team Members !

Re/ NoR%1"1100"0

1001

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Co8tr*bt*o8 to t9e ro)ect

#2 Mars'

Reort :r*t*8/ #2 Mars'

Total &'( Mar)#*

3ate!

Signature of La+ Su,er"i#or

1


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Auto Night Lamp Using High Power LED

O-.ECTI/E%

Auto Night Lamp Using High Power LEDs is a circuit which turns ON the LEDlights interfaced to it at night time and it turns OFF the lights automatically when itis day , with the help of !" and LD#$A-STRACT%

Auto Night Lamp Using High Power LEDs is a circuit which turns ON the LEDlights interfaced to it at night time and it turns OFF the lights automatically when itis day , with the help of !" and LD#$"he element which is used for sensing light in the circuit is the light dependentresistor$ "he resistance of the light dependent resistor depends on the light

incident on it$ %f the intensity of light incident on it is more, then the resistance ofthe circuit decreases$ %f the intensity of light incident on it decreases, then theresistance of the de&ice increases$

0ARD1ARE RE2UIREMENT3DESCRIPTION%

1 TR%NSISTOR #&C


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CIRCUIT DIAGRAM%

DESIGN ISSUES%

'a(imum supply &oltage should not e(ceed )*+

APPROAC03MET0ODOLOG4%

"he woring of turning on or off of high power LEDs with light intensity is seen

here$ "he element which is used for sensing light in the circuit is the lightdependent resistor$ "he resistance of the light dependent resistor depends on the

light incident on it$ %f the intensity of light incident on it is more, then the resistance

of the circuit decreases$ %f the intensity of light incident on it decreases, then the

resistance of the de&ice increases$ -e are maing use of this property of the light

dependent resistor to detect the light and there.y operate the LEDs$ -e are

arranging light emitting diodes in an array such that fi&e LEDs are in series and

fi&e such series LEDs are arranged in parallel$


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"he transistors are used in saturation mode$ "hey are used as electronic switches

in this mode$ "he transistor /*01 is a general purpose NPN transistor which is

used to further switch the LEDs$ "his is a power transistor with a heat sin$ "he

heat sin helps the transistor to dissipate the generated heat into air so that the

transistor can handle higher power loads than it can do without the heat sin$

"he entire circuit along with the LEDs is powered .y a 2+ D/ power supply$ A

.attery .ased D/ power supply is usually preferred$ Howe&er, you can use a ac

rectified and regulated power supply$

"he LEDs used in the circuit are high powered white LEDs$ "he intensity of light

produced .y these LEDs e3uals an ordinary fluorescent .ul.$ "he lighting

produced is sufficient for reading or to do any other daily acti&ity$ "he circuit can .e

assem.led on a printed circuit .oard with all the components neatly arranged and

the LEDs placed in order$ "ry to place the LEDs maintaining a distance of a.out )

cm .etween the LEDs so that the the lighting will .e well distri.uted in your room$

CONCLUSIONS%

"hus Auto Night Lamp Using High Power LED is constucted and the change ofintensity of led with incident light is successfully seen$

REFERENCES%

http455www$electronicshu.$org5auto6night6lamp6using6high6power6led5

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Documents

Ec Mini Project Report Sem 4