07-29-2017, 10:17 PM
(07-29-2017, 08:33 PM)pfeerick Wrote: Hm... that part is "TTL/MOS Input/Output Compatible"... it shouldn't be a problem, should it Marcus?
But yes, don't connect anything above 3.3v to the GPIO pins (or 3.6v if you take it to the extreme maximum rating)
Many compatible components exist that will work across a wide voltage ( which means they will work at 1v8, 3v3, and 5v ) but many more WILL NOT. So , I don't get into the discussion of making exceptions ( if you're smart enough to figure it out, and if your components allow for it, great ! ).
The general discussion is can you mix 5v and 3v3 logic , and the answer is NO; however, you may 'interface' 5v and 3v3 logic levels using a level shifter. Always use appropriate level shifters when interfacing 5v and 3v3 logic; way better safe than sorry.
marcushh777 
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( I regret that I am not able to respond to personal messages; let's meet on irc! )