problem statement of automatic night lamp morning alarm pdf
#1

Hi am Nita i would like to get details on problem statement of automatic night lamp morning alarm pdf ..My friend Ken said problem statement of automatic night lamp morning alarm pdf will be available here
Reply
#2

This circuit project automatically turns on a night lamp when the bedroom light is off. The lamp stays on until the light sensor detects daylight in the morning. A super bright white LED is used as the night lamp. It gives bright and fresh light in the room. When the sensor detects daylight in the morning, a melodious morning alarm sounds.


The automatic night-light circuit uses light-dependent resistors (LDR) to detect darkness and light in the room. The LDR resistance is very high in the dark, which is minimized when the LDR is fully illuminated. LDR1 detects darkness, while LDR2 detects light in the morning.

Operation of the night lamp circuit :

When LDR1 illuminates with ambient light in the room, its resistance remains low, which keeps trigger 2 of IC2 at a positive potential. As a result, output pin 3 of IC2 goes down and the white LED remains off. As the illumination of the sensitive window of LDR1 is reduced, the resistance of the device increases.

In total darkness, the specified LDR has a resistance greater than 280 kiloohms. When the LDR1 resistance increases, a short pulse is applied to the trigger 2 of IC2 through the resistor R2 (150 kilohms). This activates the monostable and its output goes high, causing the white LED to glow.

LDR2 and associated components generate the alarm from morning to dawn. LDR2 etects the ambient light in the room at dawn and its resistance drops gradually and the T1 transistor starts to drive. When T1 leads, the tune-generator IC UM66 (IC3) gets the source voltage of the T1 emitter and begins to produce the melody. The musical tone generated by IC3 is amplified by the amplifier T2 of a single transistor. Resistance R7 limits the current to IC3 and the zener diode ZD limits the voltage to a more secure level of 3.3 volts.

The night lamp with alarm circuit can be easily mounted on a general purpose PCB. Enclose in a good quality plastic box with provisions for LDR and LED. Use a white LED reflective bracket to get a projector effect for reading. Place the LDRs away from the white LED, preferably on the back of the case, to avoid unnecessary lighting. The speaker should be small to make the gadget compact.

Night lamp with alarm scheme:

[Image: night-lamp-alarm.gif]
Reply

Important Note..!

If you are not satisfied with above reply ,..Please

ASK HERE

So that we will collect data for you and will made reply to the request....OR try below "QUICK REPLY" box to add a reply to this page
Popular Searches: how to open hdfc pdf for statement, automatic night lamp pdf, automatic emergency lamp pdf, automatic night lamp with morning alarm pdf with description, v ganeson book of ic engine problem with solutions pdf, lamp technology seminar full information in pdf, lamp server presentation pdf,

[-]
Quick Reply
Message
Type your reply to this message here.

Image Verification
Please enter the text contained within the image into the text box below it. This process is used to prevent automated spam bots.
Image Verification
(case insensitive)

Possibly Related Threads...
Thread Author Replies Views Last Post
  Over Speed Alarm Indicators of Electrical Motor with Digital RPM Indicator 0 250 25-07-2023, 05:33 AM
Last Post:
  AUTOMATIC TELLER MACHINE 0 801 05-02-2019, 03:14 PM
Last Post:
  Earthquake detection alert alarm for people security ppt 0 866 06-01-2019, 09:29 AM
Last Post:
  Earthquake detection alert alarm for people security 0 784 06-01-2019, 09:25 AM
Last Post:
  fire alarm project for class xii pdf 0 1,181 31-10-2018, 08:37 PM
Last Post: Guest
  literature review for automatic voltage changeover switch article 0 817 03-10-2018, 06:42 PM
Last Post: Guest
  advantages and disadvantages mains failure alarm circuit in pdf 0 780 01-10-2018, 11:48 PM
Last Post: Guest
  automatic mobile recharge station with ppt 0 638 20-09-2018, 12:27 PM
Last Post: Guest
  source code for automatic question paper generator system in vb net 1 980 20-08-2018, 09:59 PM
Last Post: BP170512
Tongue engine overheat alarm pdf 0 535 04-08-2018, 08:32 AM
Last Post: Guest

Forum Jump: