Step 09.23 — Fit the Raspberry Pi 3/4 HAT power adapter¶
Step 23 of 36 · Chapter 09 — Electronics bay
Parts:
- Raspberry Pi 3/4 HAT power adapter ×1 (verify on bench) · the Leviathan box
Do: Seat the 3/4 adapter onto the Pi's GPIO header in the orientation LDO's image shows, and connect its lead to the Leviathan's Raspberry Pi supply port. There is no USB-C brick in this machine.
Check
Adapter fully seated on the GPIO pins with no row offset. Lead reaches the Leviathan's Pi power port without tension.
What you're looking at
This is how the Pi gets powered: a small adapter sits on its GPIO header and takes 5 V from a dedicated port on the Leviathan. The kit ships Pi 5 and Pi 3/4 versions, and they are not interchangeable.
Caution
Rev D+ / LDO: the kit ships adapters for both Pi 5 and Pi 3/4, and "the orientation differs" between them. You have a Pi 4B — use the 3/4 adapter. Fitting the Pi 5 adapter to a Pi 4 puts supply on the wrong pins. src
Caution
Rev D+ / LDO: this replaces manual p.190 as well ("the kit uses the Leviathan to supply the 5v power for the Raspberry PI"). src
Source: LDO Leviathan V1.3 board guide · LDO Build Notes § Voron 2.4 build FAQ · Video: Part 8 @1:55:00 (differs: BTT Octopus + separate Raspberry Pi; this kit is a Leviathan with the Pi mounted on it)