Automatic Room light Controller with Visitor Counter

Automatic Room light Controller with Visitor Counter

Project Cost: 5,200

Project Code: 1101

Download the Synopsis of the project

Description of the project:

Wastage of electricity is one of the main problems which we are facing nowadays. In our homes, schools, colleges, or industry we see that fans/lights are kept on even if there is nobody in the room or area/passage. This happens due to negligence or because we forgot to turn the lights off or when we are in a hurry. To avoid all such situations we have designed this project called “Automatic room light controller with visitor counter”.

This project has two modules:

  1. The first one is known as the “Digital Visitor counter”
  2. The second module is known as the “Automatic room light controller”.

The main concept behind this project is known as the “Visitor counter” which measures the number of persons entering any room like a seminar hall, conference room, or classroom. This function is implemented using a pair of Infrared sensors. LCD display placed outside the room displays this value of person count. The person count is incremented whenever someone enters the room.

The lights are turned on whenever the person count is greater than zero. And in a reverse way, the person count will be decremented if somebody leaves the room. When the number of persons inside the room is zero, lights inside the room are turned off using a relay interface. In this way Relay performs the operation of the “Automatic room light controller”. Since this project uses 2 infrared sensors, it can be used as a Bidirectional person counter as well.

Video of the Automatic Room light Controller with Visitor Counter

Block Diagram of the Automatic Room light Controller with Visitor Counter project:

Project Photographs:

Automatic Room Light Controller
Bidirectional person counter
Person counter with roomlight controller

You will get the following documents with this project:

  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

Description in detail:

This is one of the best sensor based projects for final year. And the 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. The reason behind choosing IR LED is, that infrared beams are not visible to human eyes and they are not easily triggered by other sources in the environment. The transmitters used are IR LEDs.
  2. IR Receiver: We have used the IR sensor as an Infrared receiver. It is an active-low device, which means it gives low output when it receives Infrared rays. So when the IR rays are interrupted by any person then Microcontroller will receive a high pulse from the IR receiver.
  3. LCD Display: We have used a 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”, and “No of Person in Room = XYZ” where XYZ is the actual person count.
  4. Relay: We have used a 12-volt relay. Since Microcontroller can not turn on the relay directly, we have used a Relay driver circuit. This circuit consists of a transistor which is used to turn on the relay through Microcontroller. We have used an SPDT relay. SPDT means Single Pole Double Throw relay. In this project, we have provided 2 pin connector as an 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.
  5. Darlington pair: It is used to increase the current gain. The output of 555 IC is given to the Darlington circuit. And the output of the Darlington pair is given to IR led, thus it increases the current through Infrared LEDs which helps in increasing the range of infrared rays emitted from IR LEDs.
  6. Microcontroller: This is the CPU (central processing unit) of our project. We have used 89s51 which is a Microcontroller of the 8051 microcontroller family. The various functions of a Microcontroller are like:
  • Bidirectional Visitor counter section – It is bidirectional because we have used 2 sensors on a single door. The microcontroller Reads the digital input from two infrared receivers and calculates the number of persons from them.
  • Display – The microcontroller sends the person count to LCD so that the person operating this project should read the number of persons inside the room.
  • Automatic Room Light controller section – The microcontroller turns on the Room Light when the person count is greater than or equal to one. And turn off the lights when the count is zero. This is done by Relay. Since the relay is used, you can connect an AC bulb or DC bulb as per your requirement. We will provide a bulb holder to connect the AC bulb.

How to give a demo of this project:

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

Enhancement added to this project:

We have added a Light Dependent 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 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 electricity and works as an energy saver. And if there is insufficient sunlight in the room then only the relay will be turned on so as to turn on the bulb.

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

  1. Digital Visitor Counter can be used in various rooms like seminar halls, and conference halls where the capacity of the room is limited and should not be exceeded. The project will display the actual number of persons inside the room.
  2. “Automatic Room light Controller with Visitor Counter” can be used in classrooms and study rooms in colleges.
  3. The automatic Room light Controller 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. The Bidirectional person counter project can be used in Cinema halls, multiplexes, malls as well as in temples to count the number of a person entering inside so that these places should not get overcrowded to avoid congestion.

Advantages of the project:

  1. The main advantage of this project is that it helps in energy conservation. Because when there is nobody inside the room then the lights are automatically turned off.
  2. Human efforts to count the number of persons are eliminated. Since this project does automatic person counting with the help of two sensors installed on the door frame.

Project Future Development:

  1. A Voice alarm system can be added to indicate that the 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 a mobile or the internet.

How to place these sensors on the door:

Below is the diagrammatic representation of how the two sensors should be placed on the door frame.

Bidirectional visitor counter

Questions and answers about this project:

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

Answer: The advantage of using an 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 an AC fan or a DC fan as well. Relay provides isolation from the Microcontroller circuit. Thus the user can use a fan operating on a 12 volts (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 persons or only 1 person?

Answer: If there is no gap between two persons, then Microcontroller will sense that only 1 person has entered into the 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 does the counting of people using transmitters & receivers work?

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 decrements 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 an RFID reader & RFID cards in this project along with the Infrared sensors?
Is it possible that in the 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 decrements 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 decrements.

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

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 breadboard 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 a 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 beings or a human body?

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

Question: I have prepared the circuit of the 555 timer IC which is giving an 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 the IR transmitter and receiver that 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 resistor 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 volts as an output of the relay because here in Canada we have lights that work at 120 volts? The transformer works at 240V but here in Canada, we have 120V so do we change the transformer to 120v if yes what transformer do we need? Secondly is it possible for us to remove the transformer and directly supply 9volts to the circuit? If yes then at what point we can connect the DC supply because 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/500 milliampere 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.

Question: 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?

Answer: 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.

Question: 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 ?

Answer: 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.

Question: Does it works for same entry ,exit door..????

Answer: Yes it works for the rooms which has only 1 door for entry and exit.

Question: when a cat or any other animal comes across the IR sensor, will the light remain on or off?

Answer: Sensors does not differentiate 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.

Question: Can you please explain the use of 555 Timer ICs in the project?

Answer: 555 Timer IC is used as a driver circuit for IR LEDs.

Question: What Will happen when the person enters the room and passes through the first sensor but for any reason, he will come back before reaching the second sensor??

Answer: In such cases the counter will not be incremented. There is a waiting period of 5 seconds. If the second sensor is not interrupted within 5 seconds then the waiting period gets over and action is cancelled.

Question: What is the use of a buzzer in this project?

Answer: 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.

Question: can we use LDR in this circuit so when sunlight is there lights will remain off

Answer: We have already implemented this part as part of enhancement in our circuit.

Question: Hi sir, this project is almost well for us but I want to know about the disadvantages of this project. Thank sir.

Answer: As mentioned in the description above, limitation can be, “when two people enter without gap in between them, then system will not be able to detect it” and another limitation is of maximum person count which is 255.

Question: Which sensor will be used to differentiate between the human body and the animal body?

Answer: Its quite difficult to get such sensor.

76 thoughts on “Automatic Room light Controller with Visitor Counter

  • supraja

    when did the research on this project was started and by whom?

  • Mohamad Nazreen

    Hi im from malaysia, if i order this project, when can i get it?

    • Microtronics Technologies

      Hi Mohamad Nazreen, you can get this project in 7 working days.

  • harit

    can anyone tell whether we can use a human sensing system to detect a person inside the room ???

    • Microtronics Technologies

      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.

  • Devang b patel

    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 .

    • Microtronics Technologies

      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.

  • mbavu

    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?

    • Microtronics Technologies

      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.

  • Name

    Hi Guys very useful content.
    Can u guys make a tutorial to detect room entry alert system using alarm with clear explanation ???

  • guhan

    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..:-)

  • Naveen

    How to differentiate two transmitter from their respective receivers?

    • Microtronics Technologies

      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.

  • naomi debrtsion

    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

    • Microtronics Technologies

      Hi naomi debrtsion, please post your questions.

  • khushboo thakare

    how can we implement this project by sending the data to a remote location using mobile or internet?
    plzzzz reply as soon as possible…..

    • Microtronics Technologies

      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.

  • Roshan

    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?

    • Microtronics Technologies

      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.

  • shanthini

    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..

    • Microtronics Technologies

      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.

  • Dilawer

    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…..

    • Microtronics Technologies

      Yes, we can send the data to remove location via GSM modem

  • anjali

    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???

    • Microtronics Technologies

      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.

  • kashaf

    why this project can’t work for 2 or more persons whlie entering in room at same time?

    • Microtronics Technologies

      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.

  • Jridi hamza

    plz what’s the IR transmitter reference that you used in this project??
    thank you 🙂

    • Microtronics Technologies

      Hi Jridi hamza, IR transmitters are normal Infrared LEDs.

  • shradha

    can this project will work for 5 rooms simultaneously and how???

    • Microtronics Technologies

      No, this project can not work for multiple rooms simultaneously. You have to install one project for each room.

  • anushka

    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

    • Microtronics Technologies

      H​i Anushka, This project can not be implemented without microcontroller. Since it is really difficult to interface / drive LCD display with analog circuit.

  • bhakti2

    can i interface dc motor on this object counter becaus when no. of entering person leave the room than door automaticaly closed

  • Elaine Lombog

    hi, would it possible if I add temperature control in this project?

    • Microtronics Technologies

      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.

  • papun

    sir , can we connect at a time 1fan+2light+1tv with this project ?

    • Microtronics Technologies

      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.

  • Mukta

    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?

  • Felix

    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?

    • Microtronics Technologies

      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.

  • Lakshmi

    How to check if IR sensor is working or not?and then transmitter and receiver circuit if both are have IR sensor or not?

    • Microtronics Technologies

      These details are mentioned in the project report. You will get all documents after purchasing the project.

  • palak

    I have a doubt..how actually the IR transistors work over here?

  • kinnu

    what is the range of these IR sensors?

  • Arif

    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…

    • Microtronics Technologies

      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.

  • encikpatrick

    how about the price of this project ? i’m from malaysia , how can i get this project ?

    • Microtronics Technologies

      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.

  • MOHAMMAD SARFARAZ

    can we modify this project by using the RF ID READER?

    • Microtronics Technologies

      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

  • ramya

    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……

    • Microtronics Technologies

      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.

  • Rajkumar

    Is the programme is alredy dumped by you ? Or we have to dump ?

    • Microtronics Technologies

      Hi Rajkumar, the microcontroller IC is already programmed.

  • sunil kumar

    i am making the project of control the various home appliance with the help of plc so suggest me
    first is what type of senser using
    and other is what type of fan and motor used and how to count the person entered in room plzz suggest me

  • Bijan

    Hey, If some enters half (1st sensor) and return back, then another enters from other side half (2nd sensor), It could increase or decrease the count! so how you have managed this problem?? thanks

  • B.GANESH

    suppose a person cut the first sensor and takes u turn before cutting the other sensor,will the project works.

    • Microtronics Technologies

      Hi B.GANESH, yes the project will work. In this case it will not increment or decrement the count.

  • prathima devi

    NICE PROJECT
    HOW ABOUT THE POWER CONSUMPTION WHEN WE ARE GOING OUT FOR SUCH LONG HOURS……..

  • DIVYANSHU

    sir i want this project so can you provide your contact information and email id

  • Divyanshu Mahato

    Hello sir I am a 9th standard student and was also thinking of this type of project only , so I thought to check out that whether it is designed earlier or not this project is very helpful for me and I wanted to ask you that should i use this project to present in the science project exhibition or competition???

  • naga akhil es

    sr can it sense both entering and leaving of a person simultaneously

    • Microtronics Technologies

      Hi naga akhil es,
      It can not detect this situation. There should be only 1 person entering or leaving.

  • Nagraj

    can u plzzz list all disadvantages?

  • Lucas mwita

    Hi am Lucas mwita from Tanzania if I wanna order this project how many day it take to get it

    • Microtronics Technologies

      Hi Lucas mwita, you will get this project in 8 to 10 days in Tanzania

  • RAJ

    I want to know that if you are using controller 8051 is there any program written on it ?

    • Microtronics Technologies

      Hi Raj, yes there will be a program (HEX code) downloaded into the controller.

  • Jambulingam Hemanth

    Hi Sir, I found this project interesting although the what will happen if the two persons enter and exit at the same time then there will be a collision between the entry and exit. how to overcome it? and how it will differentiate in and out of person?

  • Ch.anupama

    Sir can we increase maximum count of people upto 20 numbers 1 light should glow… Can we do it..? wat the changes we have to do for that

    • Microtronics Technologies

      Yes, we can implement this. We need to change microcontroller coding for this.

  • latha

    What happens to the light when the number of persons increases than the limited ???

  • Wisdom David

    How does this system operates during bed time, because it is an automatic system and there has been a counted number of persons in a room already . Thanks.

  • Puneeth b s

    What is the scope and applications of this ?

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