Automatic Room light Controller with Visitor Counter

Automatic Room light Controller with Visitor Counter

Project Cost : 5,200

Available in: 5 Days

Project Code: 1101

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CD

You will get a CD with this project:

CD contains following things:

  1. Project Report in pdf format and in word format ( .doc or .docx )
  2. Circuit diagram
  3. PCB layout
  4. Microcontroller Program in assembly language
  5. Hex file of the microcontroller code
  6. Datasheets of all the components / ICs used in the project
  7. Power point presentation / PPT file
Synopsis of the project:

Download Project Synopsis

Click here to Download project synopsis in pdf format

 


Description:

Wastage of electricity is one of the main problems which we are facing now a days. In our home, school, colleges or industry we see that fan / lights are kept on even if there are nobody in the room or area / passage. This happens due to negligence or because we forgot to turn lights off or when we are in hurry. To avoid all such situations we have designed this project called “Automatic room light controller with visitor counter”. This project has two modules, first one is known as “Digital Visitor counter” and second module is known as “Automatic room light controller”. Main concept behind this project is known as “Visitor counter” which measures  the number of persons entering in any room like seminar hall, conference room, classroom. This function is implemented using a pair of Infrared sensors. LCD display placed outside the room displays this value of person count. This person count will be incremented if somebody enters inside the room and at that time lights are turned on. And in reverse way, person count will be decremented if somebody leaves the room. When number of persons inside the room is zero, lights inside the room are turned off using a relay interface. In this way Relay does the operation of “Automatic room light controller”. Since this project uses 2 infrared sensors, it can be used as Bidirectional person counter as well.

Block Diagram:

Automatic Room light Controller with Visitor Counter

Description in detail:

Following are the important modules in this project:

1. IR Transmitter: We have implemented the Person counter module using 2 transmitters and 2 receivers. We have used Infra-Red transmitters. Reason behind choosing IR LED is, infrared beams are not visible to human eyes and they are not easily triggered by other sources in the environment. Transmitters used are IR LEDs.

2. IR Receiver: We have used IR sensor as an Infrared receiver. It is an active low device, which means it gives low output when it receives the Infrared rays. So when the IR rays are interrupted by any person then microcontroller will receive a high pulse from the IR receiver.

3. Microcontroller: This is the CPU (central processing unit) of our project. We have used 89s51 which is a microcontroller of 8051 family. The various functions of microcontroller are like:

I. Bidirectional Visitor counter section – It is bidirectional because we have used 2 sensors on a single door. Microcontroller does the function of Reading the digital input from two infrared receivers and calculates the number of persons from them.

II. Display – Microcontroller sends the person count to LCD, so that the person operating this project should read the number of persons inside the room.

III. Automatic Room Light controller section – Microcontroller turns on the Room Light when person count is greater than or equal to one. And turn off lights when count is zero. This is done by Relay. Since relay is used, you can connect an AC bulb or DC bulb as per your requirement. We will provide a bulb holder to connect AC bulb.

4. LCD Display: We have used 16×2 alphanumeric Liquid Crystal Display (LCD) which means it can display alphabets along with numbers on 2 lines each containing 16 characters. This display should be placed outside the room. It displays various messages like “Person Counter Incremented”, “Person Counter Decremented”, “No of Person in Room = XYZ” here XYZ is the actual person count.

5. Relay: We have used 12 volt relay. Since microcontroller can not turn on relay directly, we have used a Relay driver circuit. This circuit consists of a transistor which is used to turn on relay through microcontroller. We have used a SPDT relay. SPDT means Single Pole Double Throw relay. In this project we have provided 2 pin connector as a output of Relay. One of these 2 pins is connected to the Normally open terminal of the Relay which is also known as NO contact.

6.Darlington pair: It is used to increase the current gain. Output of 555 IC is given to the Darlington circuit. And output of Darlington pair is given to IR led, thus it increases current through Infrared LEDs which helps in increasing the range of infra-red rays emitted from IR leds.

How to give demo of this project:

  • There are 2 transmitters and 2 receivers placed infront of each other. Swap any object (like mobile)  or your fingers (not single finger) in front of those sensors.
  • Then microcontroller will increment or decrement the counter.
  • Once the count is non-zero, the room light is turned on using relay.
  • Now swap object in reverse direction to decrement the count. And room light is turned off once the count becomes zero.

Enhancement added to this project:

We have added Light Dependant Resistor (LDR) in this project.

Purpose of LDR: Light sensor – LDR will detect the sunlight in the room (or we can say LDR is used to detect daytime)

If there is enough sunlight in the room (which means it is a daytime) then the relay will not be turned on even if the person count is greater than zero. In this mode it will work only as a Person counter to save the electricity and works as energy saver. And if there insufficient sunlight in the room then only the relay will be turned on so as to turn on the bulb.

Applications:

1. Digital Visitor Counter can be used in various rooms like seminar hall, conference  hall where the capacity of room is limited and should not be exceeded. Project will display actual number of persons inside the room.

2. “Automatic Room light Controller with Visitor Counter” can be used in class rooms, study rooms in colleges.

3. This project can also be used in our home because many times we come out of our bedroom or any other room and we forgot to turn off the room light.

4. This project can be used in Cinema halls, multiplex, malls as well as in temples to count the number of person entering inside. So that these places should not get over crowded to avoid congestion.

Advantages:

1. Main advantage of this project is that  it helps in energy conservation. Because when there is nobody inside the room then lights are automatically turned off.

2. Human efforts to count the number of person is eliminated. Since this project does the automatic person counting with the help of two sensors installed on door frame.

Future Development:

1. Voice alarm system can be added to indicate that room is full & persons can’t enter inside.

2. We can increase the maximum number of persons that can be counted by implementing the external EEPROM ic.

3. We can send this data to a remote location using mobile or internet.

Video of the project: Automatic Room light Controller with Visitor Counter

How to place these sensors on door:

Below is the diagramatic representation on how the two sensors should be placed on the door frame

Bidirectional visitor counter

Snehal Shinde


Question and answers about this project:

Question: Why you have used Infrared sensors to count the no of persons? What are the advantages?

Answer: Advantage of using Infrared sensor is that IR rays are not visible to human eyes. Also IR rays are not affected by any other sources. For example: If you use LDR as a sensor then it can be easily triggered by sunlight or any other sources of light.

Question: Which type of fan / lights can be controlled using this project? AC or DC ?

Answer: We have used Relay to turn on/off the fan or light. So we can use any type of fan / light. We can either use AC fan or DC fan as well. Relay provides isolation from the microcontroller circuit. Thus user can use fan operating on 12 volt (CPU fan) or a 230 volts AC fan.

Question: Suppose two people walk into the room in matching steps interval will it sense one intrusion? i.e. if two person enter the room without any gap between them then will microcontroller will detect 2 person or only 1 person?

Answer: If there is no gap between two persons, then microcontroller will sense that only 1 person has entered into room. There should be some time delay (at-least half seconds delay between 2 persons)

Question: Are you using any separate counter IC for counting the persons or microcontroller itself is configured as the counter?

Answer: We have not used any separate IC for the counting. Microcontroller does all the functions. It is central processing unit for the project. It takes input pulses from sensor, counts the person, activate/deactivates the relay.

Question: How the counting of people using transmitters & receivers works ?

Answer: We have used to 2 pairs of Transmitter and receiver. These should be placed on the door frame, in-front of each other. If a person enters the room then first receiver will cut and then second receiver will cut. Then microcontroller will increment the count. And if any person leaves the room then second receiver will cut and then first receiver will cut. Then Microcontroller will decrement the count.

Question: Concerning pets in the room, are they likely to trigger the system? What are the ways of avoiding false triggering?

Answer: Yes, your Pets can trigger the sensors. To avoid this situation, sensors should be placed at the higher level from ground. You can keep them at 4 feet from ground. But 1 more thing, if your pets jump 4 feet from ground then this will trigger the sensor:-):D1

Question: Can we use RFID reader & RFID cards in this project along with the Infrared sensors ?
Is it possible that in entry operation, the RFID will count and in the exit operation, the infrared will count?

Answer: Yes, this is possible. We can implement this project using RFID reader.
Whenever person enters the room, he/she will show the RFID card to RFID sensor and the counter will count as one but the infrared entry will not be activated. But when the person is leaving the room, the infrared exit operation will be activated and the counter will decrement by one and the lights will turn off if nobody is in the room.
The RFID sensor will be placed outside the room for the Entry and the infrared sensors will be placed at side of the door for the exit operation. Meaning, if the person enters the room and he/she shows the rfid card to rfid sensor, the rfid will activate but it disregards the infrared entry operation. But leaving the room, the infrared will do the task and the counter will decrement.

Question: If this project is used during daytime then lights will always turn on & off and this will lead to wastage of electricity. How to overcome this situation? Or can’t this project be used during day time?

Answer: In some specific seminar hall, conference rooms and study rooms, sunlight can not reach in daytime as well. This is to give some presentations on projector or big screens. In these cases lights are turned on even in daytime.
In other cases, where sunlight is enough and lights are not required in day time, we can turn off the project so it will not function. And then we can turn on the project in evening time.

Question: I tried to replicate the circuit of the transmitter and receiver on a bread board using the given components. The output of both transmitters was adjusted to 38 KHz. But the IR receiver is not giving active low output. What can be the problem?

Answer: Use a potentiometer to adjust the frequency of transmitter circuit. Also check the connections of TSOP1738 IR receiver circuit, sometimes problem could be in receiver.

Question: In this project can we use any sensor other than TSOP1738? Any animal like dog may also enter the room & will get counted by the counter, this will lead to an error. Can u suggest any other sensors which will detect only human being or human body?

Answer: TSOP1738 IR sensor is the most suitable sensor for this project.

Question: I have prepared the circuit of 555 timer which is giving output of 38khz. Problem is that the Red LED connected to the IR receiver is always active (always turned on) and only blinks when I try to cut the infrared beam from the arrangement of IR transmitter and receiver which you sent me. What can be the problem?

Answer: I have reviewed circuit and have 2 suggestions. First one, Capacitor connected to Pin 5 of IC555 should be 103 pico Farad. And the third terminal of potentiometer RV is left open. It should be connected to second terminal of variable restistor RV. Then set the resistance between pin 7 and 6 to 11.4 kohm. If the circuit is still not working properly then try varying the potentiometer, reduce the resistance. LED should turn off when Transmitter is facing towards Receiver.

Question:Can we get 120 volt as output of the relay because here in Canada we have lights works in 120 volt ? The transformer works at 240V but here in Canada we have 120V so do we change the transformer to 120v if yes what transformer we need? Secondly is it possible if we remove the transformer and directly supply 9volts to the circuit? If yes then at what point we can connect the DC supply coz then we gave to skip the dc converter circuit?

Answer: Relay does not give any voltage output. Relay acts as a switch. About transformer: you can use 9volt/500mili ampere transformer. And if you want to operate this project on regulated DC supply then you can remove transformer and you can directly give 9 volts supply. You have to remove transformer wires and at the same point you can give 9 volt DC supply.

Question:Can this model hypothetically sense whether a person is going in or out of a room? Can the IR sensors detect obstructions only, not the direction?

Answer: Yes, IR sensors detect the direction. This project has 2 sensors. So when person goes in 1st sensor is cut and then 2nd sensor is cut. Thus microcontroller increments the count. I have added image of how to install sensor on door on this webpage: (see at the end/bottom of page)

Question: Doubt concerning the placement of IR sensor in the door frame. In the website you have given a chart showing the placement of the circuit, in that picture the transmitter1 and receiver2 is on one side of the frame and vice versa. Why is it so? Do you have any specific reason? Can we place TX1 & TX2 on the same side?

Answer: You can place Tx1 & TX2 on same side but it will reduce the efficiency of the receiver as both IR receivers will receive the rays from both transmitters, so if the distance between 2 receivers on one side of door is less then chances are there that it will not identify that person is entering the room.

Do you have question or any feedback about this project?

Please email us your questions or write comments below.


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74 thoughts on “Automatic Room light Controller with Visitor Counter

  • 18 July, 2013 at 7:36 pm
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    I too like this project. It’s a very great idea!!! But i have a question. During night time when we go to sleep will the lights be ON or we should TURN OFF it?

    Reply
    • 19 July, 2013 at 4:14 pm
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      Hi vinothini, as per the current functionality of the project, lights will be turned on when there is one or more than one person in room. So if you don’t need lights when you are going to sleep, you should turn off the project.

      Reply
      • 23 July, 2014 at 1:58 pm
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        what if i modified this project by adding LDR. so the light will be turn on when the LDR detect darkness. And is the microcontroller need to be programmed ?

        Reply
        • 23 July, 2014 at 5:38 pm
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          Hi muhd, we have provided in the advanced version of this project. LDR will detect the sunlight. So the relay(light) will be turned on when there is darkness. And the microcontroller is pre-programmed.

          Reply
  • 23 July, 2013 at 12:37 pm
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    when did the research on this project was started and by whom?

    Reply
  • 5 August, 2013 at 8:15 pm
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    How can i implement the same project using breadboard?

    Reply
    • 31 December, 2013 at 12:21 pm
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      Hi shikha, yes you can implement this circuit on breadboard. However it will be a really complicated task since it involves lots of wiring connections.

      Reply
  • 13 August, 2013 at 4:24 pm
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    Hi im from malaysia, if i order this project, when can i get it?

    Reply
    • 13 August, 2013 at 6:02 pm
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      Hi Mohamad Nazreen, you can get this project in 7 working days.

      Reply
  • 16 September, 2013 at 8:50 pm
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    can anyone tell whether we can use a human sensing system to detect a person inside the room ???

    Reply
    • 17 September, 2013 at 5:43 pm
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      Hi harit, PIR sensor can be used to detect human being / person inside the room. But this project does not have PIR sensor. We have used 2 infrared sensors and these are installed on door.

      Reply
  • 29 September, 2013 at 8:58 pm
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    sir i want this project give me your no.

    Reply
    • 4 October, 2013 at 5:08 pm
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      Hi ROHIT RANJAN, out contact numbers are given in “Contact US” page. Also we have sent the same contact number to you through email.

      Reply
      • 6 October, 2013 at 4:42 pm
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        Sir is any sensor to detect light brightness and then on light at day timeor keep it off At day time with blood sensor and temperature sensor
        Can u give any comment about this .

        Reply
        • 10 October, 2014 at 10:10 am
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          Hi Devang b patel, we have already included Light sensor to detect daytime.
          We can even add Temperature sensor as per your requirement. But please send details of your customized requirement to our email id.
          However it is not possible to add blood sensor in this project.

          Reply
  • 4 October, 2013 at 10:18 am
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    Does it works for same entry ,exit door..????

    Reply
    • 4 October, 2013 at 5:14 pm
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      Hi Aleee, yes it works for the rooms which has only 1 door for entry and exit.

      Reply
  • 8 October, 2013 at 12:56 pm
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    am getting started with some project in the same line with this only that mine has to consider all the appliances in the room e.g. TV, radio set, fun, flat iron, computers, chargers. this will give some time lag/allowance between the occupant living the room and switching off. so my question is how viable this is?

    Reply
    • 31 December, 2013 at 12:18 pm
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      Hi mbavu, yes this is feasible. We have provided a relay with this project. It can be used to turn a single device or many devices at a time. Also we can provide a time lag between switching off devices.

      Reply
  • 14 October, 2013 at 8:26 pm
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    Hi Guys very useful content.
    Can u guys make a tutorial to detect room entry alert system using alarm with clear explanation ???

    Reply
  • 17 October, 2013 at 7:49 am
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    Sir i am guhan doing my BE. we are doing miniproject in our college. I dont like to buy some projects in some other project center. So i think some concept and when i take some notes related to my project through internet i have found yours…..the same concept “automatic on\off lights when there are person respectively”…. i am fan of yours..:-)

    Reply
  • 29 October, 2013 at 12:26 pm
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    How to differentiate two transmitter from their respective receivers?

    Reply
    • 10 October, 2014 at 9:42 am
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      Hi Naveen, Two transmitters should have sufficient distance between each other so that they will not interfere with each other. We have to take precaution that the IR rays of first transmitter should fall only on first IR receiver and not on second receiver.

      Reply
  • 23 November, 2013 at 1:31 pm
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    HI GUYS…..i am impressed by ur work i am writing this because i need ur help i am working with the same project on my final year project,,i am computer engineering student in Eritrea(east Africa).can you help me with some questions???thank you for this opportunity

    Reply
    • 31 December, 2013 at 12:14 pm
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      Hi naomi debrtsion, please post your questions.

      Reply
  • 30 December, 2013 at 2:58 pm
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    how can we implement this project by sending the data to a remote location using mobile or internet?
    plzzzz reply as soon as possible…..

    Reply
    • 31 December, 2013 at 12:13 pm
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      Hi khushboo thakare, we can implement computer interfacing or GSM modem interfacing with this project. GSM modem can be used to send SMS to a mobile placed at remote location. And PC interfacing can be used to send data to computer then a computer application can be developed to send this data to internet.

      Reply
  • 6 January, 2014 at 4:16 pm
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    when a cat or any other animals comes across the ir sensor , will light remain on or off?

    Reply
    • 10 October, 2014 at 10:17 am
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      Hi chinnu, sensors does not differenciate between a human being and an animal. So if any animal crosses the sensor then the visitor counter will be incremented or decremented (depending on the direction) and then lights will be turned on if count is greater than zero.

      Reply
  • 17 January, 2014 at 1:22 am
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    Sir, is there any kind of programming also involved with the micro-controller 89s51 in this project? If yes then are programming for counters and for LCD Displaying separately?

    Reply
    • 10 October, 2014 at 11:44 am
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      Hi Roshan, yes 89s51 microcontroller programming is involved in this project. Although there are different functions for LCD and person counter modules, but they are combined in a single program.

      Reply
  • 27 January, 2014 at 4:32 pm
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    hi i m shanthini.i m doin BE(EEE).i want some innovative,new idea for my miniproject. please send some project.i have another doubt,if i use PIR what will be the change..

    Reply
    • 10 October, 2014 at 11:48 am
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      Hi shanthini, PIR Sensor has large range as compared to normal IR sensors. So it can detect the person but it gets difficult to understand if the person is entering in the room or leaving the room.

      Reply
  • 11 February, 2014 at 9:57 pm
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    Greetings…… mn “Automatic room light controller with visitor counter” purchase krna chta hun, bt with modfication ky sath.i.e mn LCD ky data ko remote location py via GSM modul ky through bhjna chta hun.
    Kaya ap ya bna sakty hn??
    plz reply fast…..

    Reply
    • 9 July, 2015 at 11:19 am
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      Yes, we can send the data to remove location via GSM modem

      Reply
  • 1 March, 2014 at 12:29 pm
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    1) why is IR sensor the best choice in this case…why not proximity sensor or any other sensor??/
    2) what other alternative do we have for the Relay that we are using???

    Reply
    • 9 July, 2015 at 11:24 am
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      IR sensor are low cost and can not be false triggered. Relay are best for turning on devices from 5V DC to 230V AC supply.

      Reply
  • 4 March, 2014 at 12:05 am
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    Sir, Can you please provide us the research paper (if any) for the same project..??

    Reply
    • 9 July, 2015 at 11:09 am
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      We don’t have any research paper for this project.

      Reply
  • 14 April, 2014 at 12:22 pm
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    why this project can’t work for 2 or more persons whlie entering in room at same time?

    Reply
    • 10 October, 2014 at 12:00 pm
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      Hi kashaf , microcontroller just reads the output signal from IR receiver sensor. And this sensor does not recognize the number of person. It just responds to the IR rays falling on it. So if two or more person enters in room without any gap between them then it will treat as a single pulse. And this pulse will be given to microcontroller for further processing.

      Reply
  • 10 May, 2014 at 1:31 am
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    Can you please explain the use of 555 Timer ICs in the project?

    Reply
    • 10 October, 2014 at 12:01 pm
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      Hi Ahmed, 555 Timer IC is used as a driver circuit for IR LEDs.

      Reply
  • 16 May, 2014 at 8:00 am
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    plz what’s the IR transmitter reference that you used in this project??
    thank you :)

    Reply
    • 10 October, 2014 at 12:02 pm
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      Hi Jridi hamza, IR transmitters are normal Infrared LEDs.

      Reply
  • 10 July, 2014 at 9:27 pm
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    can this project will work for 5 rooms simultaneously and how???

    Reply
    • 9 July, 2015 at 10:37 am
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      No, this project can not work for multiple rooms simultaneously. You have to install one project for each room.

      Reply
  • 22 July, 2014 at 8:39 pm
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    hi guys … i’m a btech student and i’m planning to do this project for my mini project. but our professors insist that we submit the project without using any microcontrollers. is it possible to implement the same idea without the use of any programmable ICs ??? please help,, change of project is not allowed

    Reply
    • 23 July, 2014 at 6:06 pm
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      H​i Anushka, This project can not be implemented without microcontroller. Since it is really difficult to interface / drive LCD display with analog circuit.

      Reply
  • 3 August, 2014 at 11:58 am
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    can i interface dc motor on this object counter becaus when no. of entering person leave the room than door automaticaly closed

    Reply
  • 6 August, 2014 at 9:53 pm
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    hi, would it possible if I add temperature control in this project?

    Reply
    • 10 October, 2014 at 12:04 pm
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      Hi Elaine Lombog, yes we can add temperature control. However for this we need to modify the circuit. I would recommend to add a comparator instead of a Analog to digital convertor.

      Reply
  • 2 September, 2014 at 12:50 am
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    sir , can we connect at a time 1fan+2light+1tv with this project ?

    Reply
    • 10 October, 2014 at 12:06 pm
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      Hi papun, yes we can connect these devices to a single relay. But then all these devices will be turned on or off at the same time. If you want con control them individually then we need to modify the circuit to add 2 more relays.

      Reply
  • 23 September, 2014 at 12:26 am
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    I have a question,have you calculated how much energy is saved by implementing this project. Can you provide a approx. quantified value in terms of % or Watts,how much energy is saved?

    Reply
  • 2 October, 2014 at 1:40 am
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    since the counter will either increment or decrement when there is obstruction on the sensors, how can it differenciate between the person that is entering or leaving the room?

    Reply
    • 10 October, 2014 at 3:21 pm
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      Hi Felix, please refer to the image shown under “How to place these sensors on door” section.
      When person enters room then sensor sequence will be as below:
      Initially first sensor will be activated and later second sensor will be activated.
      And in case of person leaving the room, sensor sequence will be as below:
      Initially second sensor will be activated and later first sensor will be activated.

      Reply
  • 14 October, 2014 at 4:28 pm
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    How to check if IR sensor is working or not?and then transmitter and receiver circuit if both are have IR sensor or not?

    Reply
    • 9 July, 2015 at 11:23 am
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      These details are mentioned in the project report. You will get all documents after purchasing the project.

      Reply
  • 26 October, 2014 at 12:46 pm
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    I have a doubt..how actually the IR transistors work over here?

    Reply
  • 27 October, 2014 at 2:55 pm
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    what is the range of these IR sensors?

    Reply
  • 5 January, 2015 at 1:16 pm
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    Hi I am Really looking forward to purchase this project… but i am not getting how does both the Tx n Rx will count the person entering and leaving the room with same door for entrance and exit….can u please tell me the idea behind working of both the Tx and Rx for person counting…

    Reply
    • 9 July, 2015 at 11:22 am
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      Please refer to description and image given in the project details section above.
      Counter will increment if first sensor is interrupted first and then second sensor.
      And counter will decrement if second sensor is interuppted first and then first sensor.

      Reply
  • 22 March, 2015 at 8:35 pm
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    how about the price of this project ? i’m from malaysia , how can i get this project ?

    Reply
    • 9 July, 2015 at 10:31 am
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      Yes, we can ship this project to Malaysia. Extra shipping charges are applicable for delivery out of India. Please email us your address in detail. We will reply you total cost including shipping charges.

      Reply
  • 26 April, 2015 at 11:00 pm
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    What Will happen when the person enters the room and passes through first sensor but for any reason he will comes back before reaching to the second sensor??

    Reply
    • 9 July, 2015 at 10:29 am
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      In such cases the counter will not be incremented. There is a waiting period of 5 seconds. If the second sensor is not interuppted within 5 seconds then the waiting period gets over and action is cancelled.

      Reply
  • 21 May, 2015 at 12:02 am
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    can we modify this project by using the RF ID READER?

    Reply
    • 9 July, 2015 at 10:27 am
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      Yes, we can do that. Actually we already have 2 such projects.
      Project code – 1520 — RFid Based Person counter
      and Project code – 1521 — RFid & IR sensor Based Person counter with automatic room light controller

      Reply
  • 20 June, 2015 at 5:52 pm
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    i have a doubt…we r using this project for turning on/off of fans and lights….but if we want to use this device ….it should be continuously supplied with power..
    then what is the use……

    Reply
    • 9 July, 2015 at 10:25 am
      Permalink

      This project requires power. But it is less compare the the power consumption of Lights and Fans. And take an example of a big seminar hall. Where there are like 15 / 20 bulbs and fans. In such places the power consumption of project is negligible as compare to the electricity wastage.

      Reply
  • 2 July, 2015 at 7:37 pm
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    Hi…. What is the use of buzzer in this project…

    Reply
    • 9 July, 2015 at 10:22 am
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      Buzzer will be turned on when maximum limit of person count has reached. Suppose a seminar hall has seating capacity of 100 then only 100 people should be allowed inside room. Whenever 101th person enters then buzzer should be turned on to indicate that maximum capacity has reached. In this project we have set the limit to 15 for demo purpose.

      Reply

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