Smart visor sensor is a sensor which detects the stranger with an utrasonic sensor, and the visor is closed when the stranger gets in contact with the wearable person and it opens after the stranger moves away from a particular distance which is used in Arduino software. The main use is to protect the child and person who wears the visor from COVID-19 and also some spreadable viruses. The concept of a "smart visor sensor" represents an innovative approach to safeguarding individuals, particularly children, from potential exposure to contagious diseases such as COVID-19 and other easily transmissible viruses. This sophisticated system relies on an ultrasonic sensor as its primary component, which continuously assesses the distance between the wearer and any nearby individuals, effectively identifying strangers who come into proximity. Integrated with Arduino software, this technology triggers the visor to close automatically when the ultrasonic sensor detects that a stranger has come in contact with the person wearing the visor. This physical barrier serves as a preventive measure, reducing the risk of direct transmission. Importantly, the visor reopens once the stranger moves away, allowing normal interactions to resume. By offering this additional layer of protection in crowded or public settings, the smart visor sensor contributes to a safer environment during pandemics and health crises. However, it’s essential to acknowledge that this system should complement rather than replace established preventive measures, such as mask-wearing and social distancing. Moreover, its practicality, comfort, and sensor accuracy must be thoroughly assessed, ensuring its effectiveness in real-world scenarios. While this innovative technology can reduce transmission risks, it is vital to recognize that no system can guarantee absolute protection from viruses.