Touchless door bell for post-covid

Covid-19 has created a havoc in people. It is increasing day by day throughout the world. As it is been said “prevention is better than cure”,we need to search for prevention methods. We can prevent corona by following some of the preventive methods such as social distancing, avoiding surface contact, washing hands frequently and wearing mask. But we can not avoid some emergency visits to some homes, in that case we have to ring the doorbell of the owner to intimate him about our visit. Doorbells are one of the surfaces which are touched by number of people, this can be a hotspot for spreading of virus.This can be avoide by using this touchless doorbell. By using this touchless doorbell, we can avoid surface contact. By using an ultrasonic sensor and Arduino uno we can make the normal doorbel as  touchfree. As it is touchless we just have to put our hand in front of the sensor then the buzzer rings to intimate the owner of the house.