ELECTRONIC WATCHDOG
ABSTRACT: Electronic watchdog is used for your house that sounds to inform you that somebody is at gate or passing through it. The circuit comprises of a transmitter unit and receiver units, which are mounted face to face on the opposite pillars of the gate or door such that the IR beam transmitted through IR LED1 of the transmitter, get interrupted when someone is standing at the gate or passing through it.
CIRCUIT OPERATION
The transmitter circuit shown in below fig.1 is built around timer NE555 (u1), which is wired as an astable multivibrator producing a frequency of about 38KHz. The infrared (IR) beam is transmitted through IR LED1.
TRANSMITTER:
The receiver circuit is as shown in fig.2 .It comprises IR sensor TSOP1738 (IR RX1), NPN transistor BC548 (Q1), timer NE555 and some resistors & capacitors. Timer is wired as a monostable multivibrator with a time period of around 30 seconds. The melody generator section is built around melody generator IC UM66, transistor (Q2) and loudspeaker.
The power supply for the transmitter is derived from the receiver circuit by connecting its points A and B to the respective points of the receiver circuit. The receiver is powered by regulated 6V dc. For this purpose you can use a 6V battery.
RECEIVER:
The transmitter and receiver units are aligned such that the IR beam falls directly on the IR sensor. As long as the IR beam falls on the sensor, its output remains low, transistor Q1 does not conduct trigger pin of IC remains high.
When anyone interrupts IR the beam falling on the sensor, its output goes high to transistor Q1 into conduction and trigger pin of IC goes low momentarily. As a result, IC gets triggered its pin3 (output) goes high to supply 3.3V to melody generator IC at pin2, which produces a sweet melody through the speaker fitted inside the house. Output pin of 555 IC remains high for around 30 seconds.
APPLICTION:
The transmitter and receiver units are mounted on the both sides of the gate as shown in the figure.
To achieve high directivity of the IR beam towards the sensor, use a reflector behind IR LED. When somebody enters through the gate or door the IR beam is interrupted and the alarm sounds for 30 seconds. The alarm keeps sounding as long as the one stands between transmitter and receiver units.
This circuit can also be used as a doorbell or burglar alarm.
ReplyDeleteشركة نقل عفش
اهم شركات مكافحة حشرات بالخبر كذلك معرض اهم شركة مكافحة حشرات بالدمام والخبر والجبيل والخبر والاحساء والقطيف كذلك شركة رش حشرات بالدمام ومكافحة الحشرات بالخبر
شركة مكافحة حشرات بالدمام
شركة تنظيف خزانات بجدة الجوهرة من افضل شركات تنظيف الخزانات بجدة حيث ان تنظيف خزانات بجدة يحتاج الى مهارة فى كيفية غسيل وتنظيف الخزانات الكبيرة والصغيرة بجدة على ايدى متخصصين فى تنظيف الخزانات بجدة
شركة تنظيف خزانات بجدة
شركة كشف تسربات المياه بالدمام
شركة نقل عفش واثاث
ReplyDeleteشركة نقل عفش بالرياض وجدة والدمام والخبر والجبيل اولقطيف والاحساء والرياض وجدة ومكة المدينة المنورة والخرج والطائف وخميس مشيط وبجدة افضل شركة نقل عفش بجدة نعرضها مجموعة الفا لنقل العفش بمكة والخرج والقصيم والطائف وتبوك وخميس مشيط ونجران وجيزان وبريدة والمدينة المنورة وينبع افضل شركات نقل الاثاث بالجبيل والطائف وخميس مشيط وبريدة وعنيزو وابها ونجران المدينة وينبع تبوك والقصيم الخرج حفر الباطن والظهران
شركة نقل عفش بجدة
شركة نقل عفش بالمدينة المنورة
شركة نقل اثاث بالرياض
شركة نقل عفش بالدمام
ReplyDeleteشركة نقل عفش بالطائف
شركة نقل عفش بمكة
شركة نقل عفش بينبع
شركة نقل عفش بالخرج
شركة نقل عفش ببريدة
ReplyDeleteشركة نقل عفش بخميس مشيط
شركة نقل عفش بالقصيم
شركة نقل عفش بتبوك
شركة نقل عفش بابها
شركة نقل عفش بنجران
شركة نقل عفش بحائل
This is because a dealer can repair your electronics, or use them for parts to repair other devices. bobsweep pro
ReplyDeleteAs the oldest university in the country, the University MURANG'A of Malaya emphasizes the importance of knowledge for development. It offers bachelor programs in accounting, arts, biomedical engineering, business administration, computer, electrical, manufacturing and telecommunication.
ReplyDeleteelektrische Pfeffermühlen oder auch electric Peppermills. I think this is a real great blog. Really Great.
ReplyDeleteWhen your website or blog goes live for the first time, it is exciting. swami harsewanand public school
ReplyDeletelamartiniere school kolkata admission That is until you realize no one but you and your
The solar vitality is likewise sustainable. It can along these lines be utilized endlessly without getting exhausted. Zonnepanelen
ReplyDeleteGreat Article
ReplyDeleteIEEE Projects for Engineering Students
JavaScript Training in Chennai
IEEE Project Ideas for CSE
JavaScript Training in Chennai
Quickly drawn by essayist's restrictive method for composing.
ReplyDeletesouthend electrician
Yet, the key angle to recall is the way that, when you choose to purchase a solar vitality framework, you are really acquiring the ability or "potential" to make power at the present time and into what's to come. Quite flawless, huh? Zonnepanelen installateur
ReplyDeleteTelecommunications equipment and cell phones generally have the highest precious metals content - up to 10 times the average of scrap electronics based on per unit weight.Viking , Wolf, Dacor, BlueStar, GE Stove & Range Repair in Los Angeles
ReplyDeleteThis is only two examples of how counterfeit electronic components are being produced in large quantities and pushed into the global supply chain.obsolete electronic components uk
ReplyDeleteEmploying an expert to do electronics repair in your house is similarly as risky on the grounds that the specialist can send goons to take from you once he realizes what you have in your home.Helectronics
ReplyDeleteWhy I need to raise "Energy" in light of the fact that lone enthusiasm that can assist you with fixing the hardware. Best ACV
ReplyDeleteYou make so many great points here that I read your article a couple of times. Your views are in accordance with my own for the most part. This is great content for your readers. IRF4905 alternative
ReplyDeleteEnsure that the wires are fixed in and secured by electrical tape. Zonnepanelen installateur
ReplyDeletePurchasing electronic devices is consistently extraordinary diversion for gadget enthusiasts. Europa-Road
ReplyDelete
ReplyDeleteGood luck for electrical projects I think this gonna be an awesome project nice and a great project with unique ideas.
Electronic Digital Right Question #1, Asked By The Publishing Lawyer/Entertainment Attorney To The Author: electricians High Wycombe
ReplyDeleteTook me time to read all the comments, but I really enjoyed the article. It proved to be Very helpful to me and I am sure to all the commenters here! It’s always nice when you can not only be informed, but also entertained! Unique Dofollow Backlinks
ReplyDeletePushing ahead a couple of years to 1957 and enter the initial PC into the electronic blend. As you can envision, it wasn't actually a portab high voltage diode manufacturer
ReplyDeleteToday this can be performed with straightforwardness utilizing computerized inspecting, yet yesterday's legends worked hours, days and even a long time to maybe finish a brief piece! For those of us who are contemporary artists, understanding the historical backdrop of electronic music helps in liking the quantum jump innovation has taken in the new period. MOSFET
ReplyDeleteThere are advantages and disadvantages to taking the action to an electric or half breed vehicle. They are less expensive to run than ICE vehicles and have great speed, and crossover electric vehicles have great reach as well. power electronic
ReplyDeleteIt was in this period that these gadgets decreased, more open, more easy to use and more reasonable for a large number of us. In this article I will endeavor to follow this set of experiences in effectively edible parts and deal instances of the present best current advocates. buy twitch followers cheap
ReplyDeleteAwesome article. Really looking forward to read more. Keep writing.
ReplyDeleteChina equivalent mosfet
You should mainly superior together with well-performing material, which means that see it: Printed Circuit Board
ReplyDeleteThanks for taking the time to discuss this, I feel strongly about it and love learning more on this topic. If possible, as you gain expertise, would you mind updating your blog with extra information? It is extremely helpful for me. shower standing handle
ReplyDeletei really like this article please keep it up. electronic parts
ReplyDeleteNice knowledge gaining article. This post is really the best on this valuable topic. at27c010 70pu
ReplyDeleteThen, at that point, the capacitance of a capacitor can likewise be communicated with regards to its actual size.
ReplyDelete高压陶瓷电容
Before you settle on your last choice of purchasing an air conditioning unit, guarantee to actually take a look at its proficiency.
ReplyDeleteducted heating installation