Electronic house
by Ranjith | November 4th, 2008.Automatic gate light, Call bell system
This circuit may used to automatically switch ON a light at the entrance gate to premises, at night, by sensing the presence of a person. In addition, it sounds a musical bell to signify the presence of a person. The lamp is switched ON only for a short interval to save electricity.
This circuit has two stages: a transmitting unit and a sensing unit. This transmitting unit consisting of a point bulb and lens to focus the light. The transmitting unit emits a beam of light. This beam falls on LDR1. LDR1 offers a very low resistance. Voltage at pin 2 of IC 1 and IC 2 is more than 1/3 Vcc, so that its output goes low.
When any person tries to enter the gate, the light beam falling on the LDR1 is momentarily interrupted. As a result IC 1, configured as monostable flip-flop, gets a trigger pulse at its trigger input 2. Its out goes high for a predetermined time period. The period can be adjusted by varying the value of resister R1 or capacitor C1 as T=1.1*R1*C1 sec.
Output pulse from IC 1 forward biases the transistor T1. As a result the musical bell is switched ON. The musical bell is built around IC 2(UM 66). The output from IC 2 is amplified by transistor T2 to drive an 8-ohm, 500mW-load speaker. IC 2 is also gets trigger pulse at its trigger input when IC 1 gets trigger at its trigger input because trigger input pin 2 of IC 1 and IC 2 are shorted. Therefore its out goes high for a predetermined time period. The period can be adjusted by varying the value of resister R2 or capacitor C2 as T=1.1*R2*C2 sec. Output pulse from IC 2 forward biases transistor T3 and relay R1 is energized, but the bulb is switched ON only at night.
An LDR based circuit is used to switch ON the bulb at night only. The bulb is switched ON when relay R1 and R2 are energized. Relay R1 and R2 are connected in series with bulbs to the power supply. Two relays are like two switches of the bulb.
During day time LDR offers a very low resistance, and thus the voltage pin 2 of IC 4 is more than 1/3 Vcc, so that its output goes low and the relay R2 is de-energized. These results in opening of power supply contact to the bulbs and thus switching OFF the bulbs. During the night time the dark resistance of LDR is very high, and thus the voltage at pin 2 of IC 4 is less than 1/3 Vcc, so that its output goes low and the relay RL 2 is de-energized. These results in shorting of power supply contact to the bulbs and thus switches ON the bulbs.
Circuit diagram of Automatic gate light, Call bell system
February 19th, 2010 at 2:05 pm
Can you please send me the details of this project?
February 25th, 2010 at 1:55 am
can u please send me the pcb drawing for each circuits fast pleaaaaaaaaaaaaase I neeeeeeeeed them???????
February 25th, 2010 at 1:58 am
al-marsa87@hotmail.com
March 2nd, 2010 at 10:40 pm
please mail the details to m_awan89@hotmail.com
March 5th, 2010 at 5:15 pm
hi,
i am interested in electronics house.so plz send me the related details of this projects.
March 24th, 2010 at 2:40 am
nice project
March 24th, 2010 at 2:46 am
I want to make it as a final year of my university project.pls send me details like circuit diagram, description, requirements,budget n physical view. pls my id: safayeth.bd@hotmail.com
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April 25th, 2010 at 4:26 pm
this is awesome project.please send me all pcb lay outs,circuit diagrams,lay out of circuits on house.functionong of remote controlled equipments.pls send me the full details about this project..thankuuuuu……my email id:rajeshkannapwf@gmail.com
April 26th, 2010 at 12:51 pm
I HAD FINISHED ALL THE BREAD BOARD CONNECTION ON THIS PROJECT, NOW I HAD TO PROCEED TOWARDS PCB DESIGN SO PLEASE SEND ME THE LAYOUT ON THIS PROJECT………..
SO PLEASE HELP ME MA EMAIL ID :punya_chettri@yahoo.com
May 30th, 2010 at 1:55 pm
Respected Person,
I am very intersted in smart house.
Please send me all detail related to smart house as soon as possible.
I shall be very thankful to you.
—mohit
June 5th, 2010 at 12:52 pm
sir,
i just want more abut electronic house concept
please relay on me,i want to make it my profession
June 5th, 2010 at 12:54 pm
sir,
i just want more abut electronic house concept
June 10th, 2010 at 2:49 pm
please send me this project . this is essential in now-days……..
June 25th, 2010 at 2:29 pm
Dear Sir,
I am so glad that I come across your site as I was looking for similar projects. It is very informative.
Please let me know if you have the layout and pcb details and if possible please mail the same to me to my above email. I will be ever grateful to you for that.
Thanks and warm regards,
Sushil Rao
July 4th, 2010 at 8:54 pm
hi, friend
this project is simply superb.iam very interested to know all details of the project.please send me the details please——–
bye.
July 20th, 2010 at 9:55 pm
i think i interested to do electronic house project…please send me as soon as possible about the details of this project including the circuit and the pic programming..thank you..