The Touchless Door Bell is designed to provide a hygienic and convenient way of operating a door bell without physical contact. The system uses an IR sensor to detect the presence of a hand near the door. The detected IR signal is given to an LM358 comparator, which compares the sensor output with a preset reference level. When a hand is detected, the comparator produces a trigger signal to activate the doorbell. This system reduces the need for physical contact, helps improve hygiene, and provides simple and reliable touch-free operation. The project is low-cost, easy to implement, and suitable for homes, offices, hospitals, and other public places.        

The main objectives of the project are:

  To design a touchless door bell system using an IR sensor.

  To detect a person's hand without physical contact.

  To use the LM358 comparator for reliable IR signal detection.

  To activate the doorbell automatically when a hand is detected.

  To reduce physical contact and improve hygiene.

  To develop a low-cost, simple, and reliable door bell system.

  To provide convenient operation for homes, offices, hospitals, and public places.            

The major building blocks of this project are:

• 9V HW Battery.
• LM358.
• IR sensor.
• Buzzer.

         

Block Diagram:

               

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