In this video, the author is showing how he connected $10 SainSmart 8 Channel DC 5V Relay Module to an Arduino microcontroller (You can also connect Raspberry Pi) and how how he builds an 8 channel remote. Each relay on the board can handle up to 10A 230V AC, 30V 10A DC.
Courtesy: DIY Tryin
How can I afford it in a package lnclude 8 channels remote.
what about the price