# SimpleFOC shields with 3.3V microcontroller (pins)

**URL:** <https://community.simplefoc.com/t/simplefoc-shields-with-3-3v-microcontroller-pins/8380>\
**Category:** hardware support\
**Created:** [October 28, 2026, 8:02pm UTC](https://community.simplefoc.com/t/simplefoc-shields-with-3-3v-microcontroller-pins/8380 "2026-10-28T20:02:15Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pachristiaans](https://community.simplefoc.com/letter_avatar_proxy/v4/letter/p/f1d935/32.png) [@pachristiaans](https://community.simplefoc.com/u/pachristiaans)\
**Post date:** [October 28, 2026, 8:02pm UTC](https://community.simplefoc.com/t/simplefoc-shields-with-3-3v-microcontroller-pins/8380/1 "2026-10-28T20:02:16Z")

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Hi everyone,  
I’m new to SimpleFOC and I’m trying to figure out how to safely use SimpleFOC shields with microcontrollers which (pins) typically have a voltage tolerance of 3.3V, i.e. a FRDM-MCXA346.  
Are there shields I can safely use with such MCUs? On what does that depend?  
I already have a SimpleFOC V2.0.4. Do I need to modify the shield for safe use with a MCXA346? Like resoldering the 0 Ohm resistor from 5V to 3.3V? Or could I use a level shifter?