Abstract: In order to solve the intelligent transformation of existing civil elevators in a wide range and high efficiency, an externally installed voice interactive key system based on STM32 is designed. The key system takes stm32f103rct6 as the control core, and realizes the non-contact key in the lift car by combining the voice interaction part and the mechanical key part. It is an external independent auxiliary key device, which ensures that the “person object person冶 cross infection pathway off without dismantling the lift car for transformation and affecting the use of the manual keys of the original elevator. The practice shows that the system has the advantages of simple and fast installation and low production cost. It can accurately realize the speech recognition and floor selection in the elevator car, and can meet the relevant applications of elevator transformation and car epidemic prevention.

Key words: elevator control; , voice interaction; , elevator epidemic prevention