From 994f826959e8a59571e60b3512fb99c4b6777e1e Mon Sep 17 00:00:00 2001 From: Chazza <74922321+whalecoiner@users.noreply.github.com> Date: Thu, 7 Apr 2022 09:11:25 +0200 Subject: [PATCH] Add explanation for Y cable (#701) --- README.md | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/README.md b/README.md index 209f0987..f7bef3b4 100644 --- a/README.md +++ b/README.md @@ -105,6 +105,10 @@ PiKVM supports several different hardware configurations, referred to as **platf - **Recommended**: [HDMI to CSI-2 bridge based on TC358743](https://aliexpress.com/item/4000102166176.html) - low latency, more reliable, **H.264 video**. - ... or [HDMI to USB dongle](https://aliexpress.com/item/4001043540669.html) (not available for ZeroW and Zero2W) - high latency >200ms, [not very reliable](#a-few-words-about-hdmi-usb-dongle-h264-is-not-officially-supported-at-this-time)), H.264 is not supported. * Only for Raspberry Pi 4: parts for Y-splitter cable (**one variant at your choice**): + *
❓ Why is this cable necessary? + On a Raspberry Pi only the USB port that receives power is capable of acting as a USB Device. The other USB ports are capable only of acting as USB Hosts. Therefore a special cable must be used on the USB power port that it can simultanously act as USB Device for the PC/server and receive external DC power. +
+ *
:exclamation:Variant #1:exclamation:: (No mod solution - Amazon) Y cable with power blocker ends.