How to build a 21st century protection board

My latest version of boards have arrived for testing.
 

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Working well so far.😎 Now I need to build an amp to test it with.😀

Super-cool! 😎 Ultimate protection.
Arduino Mega's chip (2560) has got 54 digital input/output pins (of which 15 can be used as PWM outputs), 16 analog inputs, etc., however, it works at the same 16MHz clock "speed", so unless we want to do A LOT of analog measurements / PWM control / utilize lots of GPIO pins, 328 is more than enough. In fact, it's just right for what we need.
For logging and portal interaction via Internet connection - you are right - it's better to use something like Raspberry or other board with operating system and SS storage...
 
Looks real good , jeff !!

Your (and Val's) creation saved me more grief today. Came home to red flashing
lights !! 😱

Kid's wanted louder rock while I was gone , must of done something (short) while
hooking up more speakers (have lot's of those).

So , this project "saves butts" on a day to day basis. Whether it is my stupidity or
youthful enthusiasm.
Thanks , guys ..... Really !!

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