OpenWrt One power with 12V

ardiehl · 2025-04-18T20:42:00.389Z

Is it possible to power the OpenWrt One with 12V via USB-C without power delivery handshake or do i have to feed the 12V into VDD-SYS via a diode like it is done with VDD-POE ?

Why ? I'm currently in the process of replacing all my private access points (8 ath79 in total) with OpenWrt One's and 3 of them are supplied via a 12V switching regulator from a 24V or 48V solar system.

Thx

ardiehl · 2025-04-18T21:06:09.244Z

when i read the schematics correctly, the USB-C power is directly connected to A_VBUS and A_VBUS is connected via Q4/5 to VDD-SYS as long as there is no POE. U4 (CH224K) should only communicate via USB to request 15V (56K on CFG1).
So it should work. I only what to make sure so i will not damage one of my One's.

hecatae · 2025-04-18T23:21:21.126Z

Had an issue last week where another user needed the PD handshake, otherwise the Openwrt One would reboot when trying to activate the 5Ghz radio.

OpenWrt One - Setup, Install, and Discussion Installing and Using OpenWrt

Aha. Thanks for reminding me. I intended to try that and then forgot about it. Indeed USB-C to USB-C cable works it seems - uptime of whopping six minutes and counting! Now I googled it and see that PD requires only USB-C cables, I was not really aware of that. Thanks for the help!