If you want more than the number of pins on the Arduino simply use a chain of shift registers to expand the output.
I don't know how. And I don't know how this expanding going to work for my project.
I want make a home automation system. I want control all af my house staff through my Android phone.But I think my uno can controll only 10/12 relay.
Have you read How to use this forum it will tell you what to do with answers. In this case I advised you to use a shift register so I would have expected you to use google to look up:-Arduino shift register.You would have found this link:- https://www.arduino.cc/en/tutorial/ShiftOut
The real problem is you can't understand my problem.
From my country I can't order ebay.com or amazon.com or any other shop otside my country.
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