Video & Cameras


Cast to any device with this compact, PiKVM-compatible HDMI add-on board for the Raspberry Pi CM4

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Pi-Cast is an IP KVM that allows you to connect keyboards, displays, and mouses over the network. It supports all features of the PiKVM platform, including USB simulation and HDMI streaming. Pi-Cast also provides the ability to cast any HDMI source to your iPad, iPhone, Mac, Android device, or any other platform with support for USB Ethernet. It does so at full bandwidth, using a single USB Type-C cable, and without the need for networking equipment of any kind. And it’s tiny. Thanks to its Raspberry Pi 4B form factor, it measures just 85 x 56 x 15 mm. That gives it a footprint smaller than that of a credit card and makes it the most compact PiKVM device on the market.

Pi-Cast Demo

A Better Way to Connect

The traditional way of connecting directly to a CM4, without a network router or switch, would be to turn the CM4’s OTG-enabled USB port into an RNDIS-compatible network card and connect it to your computer directly. Unfortunately, that solution prevents you from taking advantage of one of the device’s most useful features, USB-device simulation, which allows you to emulate keyboards, CD-Rom drives, mass-storage devices, etc.

The other solution would be turn your CM4 into a hotspot, but that only works for Wi-Fi-enabled models and is vulnerable to network instability and other such issues. Using Pi-Cast’s onboard USB 3.0 Gigabit Ethernet, you can avoid these compromises by connecting directly to your CM4 through a simple USB Type-C cable.

Features & Specifications

Pi-Cast HAT Features

Pi-Cast KVM Switch Features

PCIe-to-USB-3.0 Baseboard Features

Board Layout

Pi-Cast in a Server Room? Gigabit Ethernet to the Rescue!

If you want to deploy Pi-Cast in a data center, server room, or rack, you might want to connect it to a regular RJ45 port. Thanks to the onboard signal-multiplexer chipset, all you have to do is flip a DIP switch to route the CM4’s Gigabit Ethernet signal between the onboard USB 3.0 Ethernet chipset and the external pin header used to connect to the Pi-Cast HAT.

Want to develop your own HAT? No problem! We will release the symbols and footprint of our Pi-Cast HAT design.

Multiport Switching with ATX support

Many of you have asked, in the PiKVM Reddit forum, if there is a way of multiport switching ATX control signals when using a KVM switch. Historically, the answer has been no, but Pi-Cast makes this possible. It is a two-port KVM switch capable of handling ATX signals as well as those for HDMI and USB. You can control the switch in either of two ways: through GPIO or using an EZCOO-compatible USB serial-port control protocol.

USB 3.0 Type-A Ports & Support for LTE/5G WWAN

To make Pi-Cast even more flexible, we have also manufactured a USB 3.0 expansion board with an M.2 B Key as one of the USB 3.0 interfaces. By inserting an LTE/5G card into that M.2 interface, you can give your Pi-Cast access to mobile data! This expansion board also provides three USB 3.0 Type-A ports for connecting USB thumb drives and other such devices.


Pi-CastPiKVM v4 PlusPiKVM v4 MiniPiKVM v3 HATTinyPilot KVMBliKVM HATBliKVM CM4BliKVM PCIe
Support BoardCM4 (and 4B or Zero 2W with adapter) CM4 CM4 4B 4B 4B CM4 CM4
ATX power controlYes Yes Yes Yes No Yes Yes Yes
USB simulationYes Yes Yes Yes Yes Yes Yes Yes
USB insertion & removal simulationYes Yes Yes Yes No No No No
Frame rate1080p @ 60 Hz or 1920x1200 @ 60 Hz 1080p @ 60 Hz or 1920x1200 @ 60 Hz 1080p @ 60 Hz or 1920x1200 @ 60 Hz 1080p @ 50 Hz 1080p @ 50 Hz 1080p @ 50 Hz 1080p @ 50 Hz 1080p @ 60 Hz
OLED displayYes Yes Yes Additional cost No Yes Yes Yes
USB 3.0 Gigabit EthernetYes No No No No No No No
4G/LTE RoamingYes Yes No No No No No No
Open hardwareSchematic available No No No No No No No
Size8.8 x 5.7 x 1.5 cm Unkonwn Unknown 8.9 x 8.9 x 5.1 cm 9.1 x 6.1 x 4.4 cm 9.7 x 6.7 x 2.5 cm 12 x 7 x 2.3 cm Unknown

Pi-Cast Configurations With Enclosures

We have designed enclosures for six different Pi-Cast configurations:

  1. Pi-Cast only
  2. Pi-Cast with our USB-3.0 Baseboard
  3. Pi-Cast with our Hat
  4. Pi-Cast with our KVM Switcher
  5. Pi-Cast with our USB-3.0 Baseboard & our Hat
  6. Pi-Cast with our USB-3.0 Baseboard & our KVM Switcher

Open Source

While the PiKVM software is open source, most available hardware for it is not. We would like to contribute to PiKVM maintainability, hackability, and transparency. Once our campaign has reached its funding goal, we will publish our schematics for Pi-Cast and for both of our expansion boards. We will also publish the firmware for our KVM switch.

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In the Press



"A true networked KVM like this one [is] indespensible..."


"These are really impressive pieces of kit!"

About the Team


Guangzhou, China  ·  hackergadgets  ·

HackerGadgets is an open electronic hardware design team based in Guangzhou, China. We focus on open source hardware, including consulting on embedded systems design and hardware manufacturing. HackerGadgets is passionate and actively committed to Open Source projects and electronics education.

Vileer Deng
Petter Wang

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