# Buildbotics upgrading to PI4

**URL:** <https://forum.onefinitycnc.com/t/buildbotics-upgrading-to-pi4/18726>\
**Category:** Controller (Buildbotics) Discussion\
**Created:** [February 11, 2023, 8:45am UTC](https://forum.onefinitycnc.com/t/buildbotics-upgrading-to-pi4/18726 "2023-02-11T08:45:23Z")\
**Posts on this page:** 1\
**Showing post:** 4

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [February 15, 2023, 2:29pm UTC](https://forum.onefinitycnc.com/t/buildbotics-upgrading-to-pi4/18726/4 "2023-02-15T14:29:43Z")

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Hey Wayne,

the Onefinity Controller contains [a 36 V version](https://forum.onefinitycnc.com/t/how-to-switch-the-controller-from-110-220v/2125) of [Meanwell LRS-350](https://www.meanwell.com/productPdf.aspx?i=459) power supply. It powers the [AVR Mainboard](https://github.com/OneFinityCNC/onefinity-pcb/raw/master/Gerber/controller-gerber-rev5.pdf) which has a 5 V voltage regulator that powers, among other components, the Raspberry Pi 3B that sits on top of it, but which also contains the [TI stepper drivers](https://www.ti.com/product/DRV8711) and their MOSFETs.

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