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Use 2512 SMD resistors in place of strain gauges (#104)
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As suggested in #24 (comment) and inspired by https://github.com/IvDm/Z-probe-on-smd-resistors-2512, this adds 4x 330 ohm 2512 SMD resistors to the back to act as strain gauges, rather than requiring discrete strain gauges to be glued and wired up.

Also applies a few changes I accidentally had pending locally:
- Custom footprints for the 2 3.3v LDO options to clarify the pinout options
![image](https://user-images.githubusercontent.com/414890/204078474-8327e8ed-78b5-4fe3-a91d-9c20fe54fcbc.png)
- some BOM note updates

Fixes #24
Closes #33
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@scottbez1
scottbez1 committed Nov 27, 2022
1 parent e3a5152 commit 340eed9
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53 changes: 53 additions & 0 deletions electronics/lib/Modified.pretty/SOT-223-3_TabPin2_GndOutIn.kicad_mod
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