Simple and practical fully automatic hand dryer

Nowadays, many hotels and restaurants and other public places have installed automatic hand dryers, which can dry hands without the need for hand contact. They are easy to use and eliminate contact bacterial infections. It would be very practical if the family could install one, but the author found that most of the products on the market are composed of ordinary digital devices such as: NE555, NE567, CD4069, etc. Its circuit goes through five processes of transmitting, receiving, amplifying, shaping and controlling. If you make it yourself, it will be inconvenient to install and debug the circuit, and the function will be single. To this end, the author designed a circuit controlled by a microcontroller, and combined with a commonly used hair dryer, an automatic hand dryer can be easily produced. In addition to the above functions, it also has flashing lights and crisp audio prompts.