Virtual Booth

The purpose of this paper is to review the technology and application of solar-powered sensors.It considers photovoltaic technology and then describes a selection of solar-powered sensor and its applications. Instant alert letter box is powered by solar energy. The project's goal is to use sustainable solar energy replacing battery or any other energy source. Moreover, we have developed a coding system to send notifications to mobile phones using the BLYNK app and Arduino. Therefore, once there a letter is delivered, the owner gets a notification in his/ her mobile; at the postbox the buzzer and light will be on.