we have a big lockers cabinet (hundreds of locks) in our sporting hall. I want to modernise it by making the locks electronic, and control their access via one central keypad, powered by an arduino uno.
I want to replace the mechanic lock mechanisms by stepping motors. Access to each locker is provided through a central keypad. When a user types his secret code, his locker will open.
I want to do this with an arduino uno, but I am puzzled by how to steer so many steppers (as they have many wires).
I want to use stepper BYJ-48
1a) what to use: multiplexers, shift registers, something else? 1b) what IC to use (with most outputs, lowest cost, enough power, ec.) 1c) how to chain them to achieve hundreds outputs?
2) does every stepper needs its own driver IC (ULN2003AN)?