# Core socket pinout

**URL:** <https://forum.clockworkpi.com/t/core-socket-pinout/17456>\
**Category:** PicoCalc\
**Tags:** tinkering, hardware\
**Created:** [May 14, 2025, 3:38pm UTC](https://forum.clockworkpi.com/t/core-socket-pinout/17456 "2025-05-14T15:38:38Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![DigitalDreams](https://yyz1.discourse-cdn.com/flex029/user_avatar/forum.clockworkpi.com/digitaldreams/32/16007_2.png) [@DigitalDreams](https://forum.clockworkpi.com/u/DigitalDreams)\
**Post date:** [May 14, 2025, 3:38pm UTC](https://forum.clockworkpi.com/t/core-socket-pinout/17456/1 "2025-05-14T15:38:38Z")

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I’ve noticed most references to the core socket pin functions are reversed and hence don’t match core pinouts of the Pico/Pico2 etc when viewed from the socket/core front itself. So here it is reversed and reduced…

 ![Screenshot_20250514_163143_Gallery](https://canada1.discourse-cdn.com/flex029/uploads/clockworkpi/original/2X/7/746968fdfdeb8dc59e41a903162e32fcc69c114e.jpeg)

As time goes by I intend to add notes as to where pins go, which I/O are totally free etc. I did note the 3.3V out was 0.9% low with two full batteries so an external quality voltage reference needed for more accurate A-D measurements.

NOTE I TAKE NO RESPONSIBILITY FOR ERRORS IN THIS DIAGRAM OR WITHIN THE NOTES OF THIS POST. USE AT YOUR OWN RISK.