Download Synopsis of the project. Wastage of electricity is one of the main problems which we are facing nowadays. This happens due to negligence or because we forgot to turn lights off or when we are in a hurry. This function is implemented using a pair of Infrared sensors.

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Download Synopsis of the project. Wastage of electricity is one of the main problems which we are facing nowadays. This happens due to negligence or because we forgot to turn lights off or when we are in a hurry. 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 the room and at that time lights are turned on. And in a reverse way, 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. Since this project uses 2 infrared sensors, it can be used as a Bidirectional person counter as well. This is one of the best sensor based projects for final year. And the following are the important modules in this project:. 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 the 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. Below is the diagrammatic representation of how the two sensors should be placed on the door frame. 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 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. AC or DC? We can either use an AC fan or a DC fan as well. Relay provides isolation from the Microcontroller circuit.

Question: Suppose two people walk into the room in matching steps interval will it sense one intrusion? 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. 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.

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. 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. But leaving the room, the infrared will do the task and the counter decrements. How to overcome this situation? 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. Can u suggest any other sensors which will detect only human being or human body? Question: I have prepared the circuit of 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.

Answer: I have reviewed circuit and have 2 suggestions. 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 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 volt as output of the relay because here in Canada we have lights works in volt? The transformer works at V but here in Canada we have V so do we change the transformer to v 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 because then we gave to skip the dc converter circuit? Answer: Relay does not give any voltage output. Relay acts as a switch. 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.

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? Question: I too like this project. But i have a question. 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.

Question: what if i modified this project by adding LDR. 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: when a cat or any other animals comes across the ir sensor , will 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: 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??


Automatic Room Light Controller with Visitor Counter and Zigbee Technology

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Automatic Room light Controller with Visitor Counter

Often we see visitor counters at stadium, mall, offices, class rooms etc. This counter can count people in both directions. It can also be used at gates of parking areas and other public places. The sensor would observe an interruption and provide an input to the controller which would run the counter increment or decrement depending on entering or exiting of the person.


Automated Room Light Controller with Visitor Counter

Automatic Room Lighting System is a microcontroller based project that automatically turn on or off the lights in a room. Electricity, being one of the most important resources, must be utilized carefully. We often forget to switch off lights or fans when we leave a room. By using this system, we can intentionally forget about the lights as the system will automatically take care of them. The digital World we are living in allows us to use different technologies to automatically perform certain tasks. Such automation is very useful in certain areas like energy consumption, reducing human efforts, improving standard of living etc. The project implemented here is one such project where the microcontroller based system automatically controls the room lights.


Automatic Room Lighting System using Microcontroller


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