Basic Arduino Question

24V said:

Hi everyone,

I am new to Arduino and am interested in purchasing one for a project. Unfortunately, the Arduino Uno will not work for me as I require more digital inputs/outputs (roughly 20). Which basic Arduino board can provide me with this? I was looking into the Arduino Mega 2560 Rev3 but wanted to confirm before purchasing it.

Kind regards,
24V

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cardosocea said:

what are you connecting to those pins? 5v? 24v?

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sparkie said:

They generally don't. They are fantastic little devices, and they are cheap, but they don't have the support structure that more commercial devices have. You also can't just wire up IO, you have to provide the supplementary circuitry provided internally in most controllers. Lots of similar reasons. They do, however, have some use. Say for some reason you want to track how often or when something happens, you can customize a small pi or arduino and handle the situation, so you can solve little 1 off programs quickly.

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sparkie said:

They generally don't. They are fantastic little devices, and they are cheap, but they don't have the support structure that more commercial devices have. You also can't just wire up IO, you have to provide the supplementary circuitry provided internally in most controllers. Lots of similar reasons. They do, however, have some use. Say for some reason you want to track how often or when something happens, you can customize a small pi or arduino and handle the situation, so you can solve little 1 off programs quickly.

Click to expand...

boneless said:

you can easily increase the IO by using shift registers.



for example:
https://www.instructables.com/id/Add-More-Digital-Inputs-and-Outputs-to-Your-Arduin/

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