Generally speaking, there are lots of options for wireless communication, such as infrared and laser, which have been talked about in Part 2.
Chapter 4.1 - Infrared Controller
Chapter 4.2 - Laser
In this chapter, some other widely used communication methods are to be discussed in detail, including:
Serial port communication
Wifi module - ESP8266 and Official Arduino Wifi Shield
Bluetooth module - HC-0X
integrated Wifi and dual-mode Bluetooth module - ESP32
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