说明：  STM32芯片与蓝牙HC-05通讯 蓝牙（Bluetooth）：是一种无线技术标准，可实现固定设备、移动设备和楼宇个人域网之间的短距离数据交换（使用2.4—2.485GHz的ISM波段的UHF无线电波）。蓝牙技术最初由电信巨头爱立信公司于1994年创制，当时是作为RS232数据线的替代方案， 蓝牙可连接多个设备，在与单片机连接使用也得到了广泛应用。
(Communication between STM32 Chip and Bluetooth HC-05 Bluetooth: A wireless technology standard that enables short-range data exchange between fixed devices, mobile devices and building personal area networks (using UHF radio waves in ISM bands of 2.4-2.485 GHz). Bluetooth technology was originally created in 1994 by Ericsson, a telecommunications giant, as an alternative to RS232 data line. Bluetooth can connect multiple devices, and it has been widely used in connection with microcontrollers.)