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Minimal KVM like solution to control embedded Boards

Problem statement

Assume you want to have a look at the desktop of your RaspberryPi (for whatever reasons). Typicall you plug the RPi into a monitor and attach keyboard & mouse. Sometimes that monitor is your main monitor and the keyboard is typically either also your main keyboard or one that is always in te way.

Idea

  • A cheap HDMI - USB Capture Card capturing the display of the Pi
  • A USB Keyboard & Mouse Emulator that allows your host PC to send Input to the Pi
  • Some Software that provides a KVM Window using above pieces.

System Overview

This repo contains all the neccesary data for such a setup.

Projects

picoKVMViewer

Qt based viewer. This is in early development and still has many rough edges.

To build:

sudo apt install cmake libqt5multimedia5-plugins qtmultimedia5-dev libqt5serialport5-dev
cd picoKVMViewer
cmake .
make

picoKVM2VNC

Provides a vnc server using the video data from the HDMI capture card and sends Keyborad & Mouse data trough the HID emulator.

To build:

sudo apt install cmake libvncserver-dev libv4l-dev
cd picoKVM2VNC
cmake .
make

Status

  • Keyboard emulation (currently only the german keyboard layout is implemented)
  • Mouse emulation including scrollwheel
  • Tested with remmina
  • Issues with UltraVNC on Windows

usb-hid-emulator

Arduino project for Atmega32u4 based arduinos (e.g. SparkFun pro micro) to act as a HID emulator