electronic letter box?

can anyone help me with the following project? 


I want to know whether it is possible to use Arduino uno instead of Arduino Pro mini? 

kenyer3 years ago

The Pro mini is much cheaper, but the Uno would work great.

RanjitE1 (author)  kenyer3 years ago

Thank you

The mini is a cut down Arduino , so you should be fine with a Uno.

RanjitE1 (author)  steveastrouk3 years ago

Thank you