Moving to 3.3V ... compatibility etc?

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i've been thinking moving 3.3v controllers quite while now. because things esp8266 half size of pro mini , yet way more powerful , provide way more features. built-in wifi.. 

but i'm scared fact operate @ 3.3v. can't user of 5v modules suck. 

so ways go 5v 3.3v?

putting in logic level converter kinda destroy point of going smaller controller... unless of course there tiny ones fit in pin hole or so...

quote from: felic on aug 02, 2016, 01:28 pm
<...>
but i'm scared fact operate @ 3.3v. can't user of 5v modules suck.  so ways go 5v 3.3v?

putting in logic level converter kinda destroy point of going smaller controller... unless of course there tiny ones fit in pin hole or so...
may suggest @ 32-bit maple mini clone,... $4 aliexpress;
http://www.aliexpress.com/item/leaflabs-leaf-maple-mini-arm-stm32-compatibility/32214664071.html

with stm32f103 uc, there number of input pins 5v tolerant... documentation:
quote
pin maps
part of maple ide's job convert normal pin numbers corresponding gpio port , bit when call functions pinmode(). using pin map, lists gpio port , bit each pin number. gpio documentation board includes pin map, lists other peripherals pin number:

maple
maple ret6 edition
maple mini
maple native (beta)
the current , voltage limitations determined using stm32 datasheets. in particular, gpio pins 5v tolerant, which means applying 5 volts pin , reading input or allowing drain ground not damage pin. connecting voltage higher 3.3v non-5v tolerant pin may damage board.
the output of 3.3 volt logic gate fall within range of 5v input signaling, voltage converter not required.

obviously, not pins 5v tolerant on maple mini clone baite, significant number makes experimentation useful:
check out maple mini pin map. ... go down 4 paragraphs ....

the stm32 maple mini supported forum... branched couple of years forum.


ray



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