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Automatic Night Lamp With

Morning Alarm

By:Shashank yadav 735Umesh Choudhary 746Vipul Singh 749

Mentor:Prof. Rehan Ahmad

Mukesh Patel School Of Technology Management & Engineering

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IntroductionAutomatic night lamp with morning alarm is a very useful daily life project.

This circuit automatically turns on a night lamp when rooms light are switched off. The lamp remains ‘on’ until the light sensor senses daylight in the morning.

The circuit is designed around the popular timer IC 555, which is configured as a monostable

The circuit utilizes light-dependant resistors (LDRs) for sensing darkness and light in the room.

IC 555 is activated by a low pulse applied to its trigger pin 2. Once triggered, output pin 3 of IC 555 goes high and remains in that position until timer is triggered again at its pin 2.

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Component Used1. IC 555

2. LIGHT DEPENDENT RESISTOR (LDR)

3. MUSIC GENERATOR UM66

4. 8Ω, 4.5W SPEAKER

5. RESISTORS 220Ω, 560Ω, 580Ω, 1k, 120k, 150k

6. LIGHT EMITTING DIODE

7. ZENER DIODE

8. TRANSISTOR BC548

9. CAPACITOR 0.01µF

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IC UM66IC NE555N

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Light Dependent Resistor

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Circuit Diagram

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The a-stable multi-vibrator uses a 555 timer IC for generation of oscillations. The a-stable multi-vibrator is shown in above figure.As shown in the schematic above, when push button PB is pressed, a square output will be generated from the 555 timer which gives a frequency of approximately 50 Hz to the 7490 decade counter IC. The frequency of the a-stable 555 timer is calculated by using the standard formula of the timer. f = 1.44/(1K + 2*1K)(0.01uF) = 48 Hz

Working

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The 7490 integrated circuit counts the number of pulses arriving at its input. The number of pulses counted (up to 9) appears in binary form on four pins of the IC.When the tenth pulse arrives at the input, the binary output is reset to zero (0000) and a single pulse appears at another output pin.So for ten pulses in there is one pulse out of this pin. The 7490 therefore divides the frequency of the input by ten.If this pulse is applied to the input of a second 7490 then this second IC will count the pulses from the first IC. It will give one pulse out after 100 pulses have been applied to the first IC.The 7490 can be connected to divide by other values

Working Continues…….

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The output from the 555 timer is then connected to the input of U1 7490 decade counter. When the decade counter reach the count of 9, the outputs of QA and QD will go to logic "1" and the counter is reset. The 7447 BCD to 7 segment decoder is used to drive the 7 segment common anode display.

Working Continues…….

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Advantages

1. Digital Dice can be used to play snake ladder, monopoly games replacing the old traditional dice.

2. Digital Dice can also be used for housie games as it displays random numbers.

3. Digital Dice theory can also be used in circuits for showing the count number.

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Any Questions?

Thank You!!!

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