16 channel control

Hi, I'm very new to Arduino so please forgive me if I state something incorrectly. I am intending to build a project requiring independent control over 16 digital outputs. It appears that the Arduino Mega 2560 is a board which allows that. Can anyone tell me if there are other hardware options and how they might be implemented?

Thanks much in advance!

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What is your project going to do?

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Arduino Uno, Nano, Promini all have 20 digital IO.
Can also use shift registers controlled by 3 pins for 8, 16, 24, 32 ... 360 outputs (45 chips is the most I've done).