The objective of this study is to create an improvised contactless doorbell with the use of an ultrasonic sensor to detect the person and give alert using a buzzer which could be used for distance measurement without physical contact for small distances. The output of the study will help reduce the virus transmission and promote household secure safety and convenience of usage since this type of doorbell does not need to have a button for someone to press in order for it to chime instead, the only thing needed for the device to work is the visitor?s movements. Its unique features used ultrasonic sensors to emit and receive ultrasonic pulses that relay information about the proximity of an entity. The Arduino Nano will be used to interpret signals detected by the sensor. Results of the study showed that a contactless doorbell has proved its consistency in terms of the function?s efficacy during the time interval for the command to be executed after the object is detected. It also revealed that an average of 0.29 seconds that the contactless doorbell was able to establish its consistency. Further, the contactless doorbell has shown its efficacy in its ability to detect things at distances of one centimeter, two centimeters, and five centimeters. Transforming our traditional doorbells into a contactless doorbell is indeed an innovation that is timely in helping mitigate the spread of virus.

Contactless doorbell

Ultrasonic sensor

Arduino