The difference between wireless and wired communication lies in the different transmission media. The most commonly used Bluetooth module is the HC-05 master-slave integrated Bluetooth serial communication module
The antennas of the Bluetooth module mainly include: ceramic antenna, PCB antenna, IPEX external antenna and 2.4G rod antenna.What are the differences between these four antennas?Bluetooth module.
What’s the differences between UART, SPI and IIC interface?