Touching of a doorbell switch by different people can spread coronavirus and many other communicable diseases from one person to the others. So, protection from such diseases at the entrance doorbell switch is as much necessary as the use of a hand sanitiser. This project is meant to help in combating the spread of viruses and diseases that might transfer during the touching of doorbells.
This touchless doorbell can be made easily with the help of an Arduino development board. The bell rings only when the visitor’s hands are found to be sanitised. To ring the bell, the visitor needs to bring her/his hands just 3cm to 5cm away from the MQ3 gas sensor. Author’s prototype is shown in Fig. 1.