How to develop an Automatic Auditorium: - DIY Project

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As the name suggests this DIY project is for converting any auditorium to become an automated one. It is an era where everything is going through a phase of automation. Considering that this DIY project has been devised.  It can be said as a simple science project because no microcontroller is used so the coding can be set aside. In this DIY project the number of persons in the auditorium at present is counted and depending on that light will glow. When the projector goes on the light will go off and the window shutter gets closed. The given below is the block diagram of this DIY science project.

Block diagram of DIY Project

Block Diagram

Block Diagram

The block diagram gives the section wise connection of this project. The counter section will be giving the number of persons present in the auditorium. The next section is for the illumination purpose. Depending upon the number of persons it will 'on' the lights.  The next section is for the projector section. When the projector goes on the light should go 'off' and simultaneously the shutter should close.

Circuit Diagram of DIY Project

Circuit Diagram

Working of the DIY Project

The working of the DIY science project is described below:

Two IR sensors are connected at the entrance and exit door of the auditorium. The IR sensor output is connected to a counter IC. The entrance IR is connected to the increment pin of the counter. As a person enters the auditorium a one value is incremented to the present value. The exit IR is also connected to the counter but to its decrement pin. As a person leaves from the exit door a one value is reduced from the present value. Two counters are there. One counter is for the unit place and another for the ten’s place.

The seating arrangement is made in such a way that the first twenty will be sitting in the first two rows and the next twenty in the last two rows. As soon as the persons start to occupy the seats the light of that section goes on. If the number exceeds 20 then the light of the second section goes on. The two lights are connected to the system via a relay. The values from the two counters are ‘NAND’ and the result is given to the relays to switch the respective lights.

When the show starts the projector turns on. The light of the room goes to the off condition. Simultaneously the window shutter also closes. A LDR is used for these two. For switching of the lights, the output from the LDR is ‘AND’ with the output from the ‘NAND’ IC. For the closing the window shutter another LDR provided. Two switches ‘left limit and ‘right limit’ is also included in the circuitry. These two switches are for the setting the limit of closure of the shutter. A DC motor is connected to drive the shutters in the specified directions.


A simple science project has been accomplished using minimum components. This DIY project will be a useful science project for the school goers. This science project is a low cost one and main attraction of this DIY project is no microcontroller used.

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