In our day-to-day activities, we often don't remember to switch off or on the lights in our rooms. This system comes in to help us solve this problem whereby you don't need a physical switch but your movement does the job. The system will take care of everything automatically.

Modern-day technology has come to automatically take care of so many things ending up minimizing human involvement, saving time, and hence improving the standards of living.

The project we are implementing here does the automatic control of the light in the room.

Requirements;

1. 5V Relay Module
2. AT89C51 Microcontroller
3. 16 x 2 LCD Display
4. 2 x Infrared Sensors
5. Power Supply
6. Lamp
7. 8051 Development Board
8. Connecting Wires

The Circuit and Description

The circuit is designed in KiCAD. The circuit shows all the connections that are needed with consideration of the microcontroller. if you decided to do the same system using the microcontroller development board then some of the components connected in the schematic are not relevant.

On the circuit, we have to connect the LCD to the microcontroller pins P1.0 to Pin1.7. They connect the two IR sensors to the microcontroller too. The relay module is connected to pin P0.0. Through the schematic above, make sure you do all the connections as shown.

Components and description

5V relay module; It is used to help the 8051 microcontrollers to be able to control the high voltage gadgets like the lights. The detailed 5V relay connection is shown in the schematic listed below. The circuit is made up of an optocoupler, two resisters, a transistor, and two diodes.

The IR sensor Module; is a simple infrared sensor that serves the purpose of detecting objects by either proximity sensing or distance measuring. it is made up of the receiver, the transmitter, and the signal processing unit.

The project when ordered for manufacturing expects to see a gadget that looks like the attached image. The design was done in KiCAD where the circuit was converted into 3D design output before being forwarded to PCBway for manufacturing.

How the System works

The most important component of this system is the IR sensor and they have to be placed strategically for them to sense the movement. Their placement determines the functioning of the system. The sensor has to be placed on both sides of the door. The sensor placed inside the room is labeled sensor 2 and the one placed outside the door is called sensor1. When a person wants to access the room, sensor one will be the first to sense then sensor 2 which will notify the microcontroller that a person wants to access the room. The microcontroller will put on the light and increment the counter to 1 and if we have more people entering the room, the microcontroller will keep the light on and keep incrementing the counter accordingly.

On the other hand, when the person tries to leave the room, sensor 2 will detect that and the microcontroller will take note of that. The lights will not go off until the last person gets out of the room as per the counter.

How to implement such a project.

Visit PCBway and directly go to the instant quote page to order for the manufacturing of the circuit above into the board which will make the project implementation easy.

From KiCAD download all the design files such as the Gerber files, the pick and place files, the BOM, the drill files, etc which you shall upload to the PCBway instant quote website.

On the instant quote page, enter all your project specifications which include the color, the number of the boards, the size of your board, the material to be used, and the quality required then click on calculate to get the appropriate quote.

Hit add to cart then submit your Gerber files in the next window that pops up. The resultant outcome is that a team of experts will receive your final submission, correct the errors and give you the final quote.

Finally submit your payments using various payment methods available on the PCBway and seat back as you wait for your final product to be delivered within seven working days.