The name of the work designed by this team is: intelligent elevator disinfection and epidemic prevention vehicle. The target group of the work is mainly those who must take elevators in the current environment where the epidemic is not over, and is mainly used in various styles of elevator cars open to the public. In view of the special transmission route of the COVID-19 novel coronavirus, this work can effectively replace the work of artificial disinfection, and has the advantages of quantitative, multi-channel, wide area, high efficiency, non-contact and so on. The team hopes that through the launch of this product, the elevator car will no longer be at high risk in this high-risk area, so that people can reduce the chance of contacting germs, improve the local public health safety level, and do our part to our team.

The hardware of this product adopts AT89C52 single chip microcomputer as the core microprocessor, and the power supply module, detection module, motor drive module and other modules are composed. The software adopts wireless communication technology, PWM wave speed regulation and PID algorithm optimization. The detection module consists of ultrasonic sensors, infrared sensors, color recognition sensors and other modules, mainly to complete the auxiliary machine operation, and detection of elevator buttons. The motor module includes DC motor, stepper motor, motor push rod and motor drive, mainly to complete the elevator disinfection, select the elevator floor. Wireless communication technology can remotely control the driving state of the receiver mainly through the transmitter. PWM wave speed control is mainly through the analysis of the detected data, and then feedback to the core processor, through the PID algorithm to adjust. During operation, the collected data can be sent to the upper computer through the core processor. At the same time, the upper computer compares the data and can also adjust the data of different elevators. The system block diagram is shown in Figure 1.

Since the elevator is generally equipped in a high-rise building, and each floor has an elevator control panel with up and down key buttons, the elevator is also equipped with a control panel with keys for each floor. This work intelligently identifies the floor through color recognition. First, it disinfects the control panel of the up and down key buttons of the initial floor (assuming that the initial floor is the first floor). Then the machine presses the upstairs key button. After waiting for the elevator to reach the first floor, the machine travels into the elevator car and disinfects the floor control panel in the car, and then presses the button of the upper floor (the button pressed at this time is the floor second button), in the process of the elevator rising from the first floor to the second floor, the machine will drive a circle in the car to disinfect the whole car, and repeat the above process after reaching the second floor, so that each floor can be guaranteed to be disinfected without omission, and the people taking the elevator will not be infected in the elevator. The top of the machine is also equipped with automatic intelligent induction hand washing liquid, disposable medical masks, disinfection paper towels and other types of personal protective equipment free of charge for the use of the elevator crowd.