The circuit operates with the power supply of 5V DC. The circuit consists of a simple and powerful IR transmitter and the IR receiver. When the coin is applied to the circuit which is designed in such a way to cut the transmitter, the triggering is applied to the interrupt pin of microcontroller. Here we use external interrupt 1.
can one say me,how many you use .com in your life time?
can one say me,i don't know what .com is?
here a amazing fact about it....
last march 15th, our .com celebrated its 25th birthday... i express my belated wishes to .COM....
In 1985 mar 15, the first website named symbolics.com was registered... but at that time very few people aware of it... it is not published in any media...but today more than 80 million domains are been registered...Yet, some of the most popular websites today were registered late into the .com era. Youtube.com, for example, wasn't registered until 2005. Twitter.com was also registered after the .com boom.
In 1985, after registering symbolics.com... next site was registered after one month and less than 100 sites were registered in a year...but according to-days survey nearly 6 lakhs sites have been registered every day...
While Symbolics the company didn't fare well, symbolics.com remains as the oldest .com and was purchased by Aron Meystedt, owner of XF.com in 2009.
for more information:http://www.25yearsof.com
This is our first mini project,worked out by myself and my friends saravana pandian , Rajesh.,FIRE ALARM.It is a very simple circuit. This project taught us the most important thing in life that there is a huge gap between the theory we learn and what happens in practical life.we faced so many difficulties to make this circuit work which helped us to learn more,and this gave us the interest to go more practically.But we didn't present it because we had one more weak to go. so, we tried seismic sensor and we presented it.
Here is our first work....
Fire accidents can be prevented if timely alarms are available. The circuit presented here warns the user against such fire accidents. The circuit should be placed in fire-prone areas such as a kitchen. Everyone is aware that when anything catches fire, smoke is produced. When this smoke passes between a bulb and an LDR, the amount of light falling on the LDR decreases. This causes the resistance of LDR to increase and the voltage at pin 2 of IC 555 goes below 1/3 Vcc, thus triggering IC 555 which is used here in bistable mode. As a result the voltage of pin 3 goes high. This high voltage (approximately +9V) completes the supply to the COB (chip-on-board). The signal generated by COB is amplified by an audio amplifier. In this circuit, the audio power amplifier is wired around IC TDA 2002. The sensitivity of the circuit depends on the distance between bulb and LDR as well as setting of preset VR1. Thus by placing the bulb and the LDR at appropriate distances, one may vary preset VR1 to get optimum sensitivity. Reset switch S1 is provided in the circuit to switch off the alarm after the fire has been noticed by the user.
Myself ALAGAPPAN, i'm doing 3rd yr ELECTRONIC AND COMMUNICATION ENGINEERING in SETHU INSTITUTE OF TECHNOLOGY.
Out of my own interest, i have taken ELECTRONIC AND COMMUNICATION as my major in engineering. where ever you go, you can see electronic and you need the communication. More over today no one can say a place without electronics and living without any communication is highly impossible,even now,i too cannot share my
ideas over here. when ever you need advancement in any field, the first option will be switching to electronics.Microprocessor & controller are rocking this world. This is what made me to like electronics more and now you would have got why i have given MY ELECTRONIC LIFE as the title to this blog.
Coming to my family, my dad is a business man, mom is home maker and brother is doing 10th now.
My living town is madurai, a very beautiful place. It has many more nice names like temple city, sleepless city and so on.. Because you can see at least a temple in each street and famous MEENAKSHI AMMAN TEMPLE is here, you can see
people working even full night. Madurai is also very famous for jasmine flower.It has more tourist place like Meenakshi amman temple, Gandhi museum, Thirumalai nayakar mahal, so on....
Then I'm interested in chatting with my friends on any topic,since they are the beautiful part of everyone's life, I have no words say how necessary is friendship. everyone knows it,hope every one feels like me.
I like to gain knowledge, so I use to read and when ever I get chance to speak with special people, I wont let them go before getting answers for all my questions(doubts). Speaking with people and getting knowledge through chats are better than gaining knowledge through books because we can easily clear all our doubts.
And I like to try things practically what ever I have learnt as theory. Because when we start working out something practically beyond our syllabus, we will learn more and we wont forget easily.
Then i have created this blog to improve myself, learn more things and to gain knowledge.. Friends,as i said to improve myself... pls comment on all my post, at least a word... say what ever you feel... because that will make me to improve...pls... Pls send your ideas,share you views on these post of this blog ....
This is my first paper.. with my friend saravana pandian.. We just want to learn and do something.. Fortunately we got this topic and we took seminar on this topic in VELAMMAL COLLEGE OF ENGINEERING AND TECHNOLOGY,madurai.. I'm saying it as seminar because we understood the concept and we explained it there,we didn't add anything new to it..
Everyone there were interested to listen this because it goes like a HOLLYWOOD scene....
HERE IS THAT SCENE FOR YOU... GO AHEAD...