BeagleBone Green HDMI Cape


BeagleBone Green HDMI Cape is a general integrated HDMI connector for expanding your BeagleBone to a rich variety of peripherals such as computer monitor, video projector, digital television, or digital audio device. This board features a standard HDMI receptacle that can be connected to a monitor with a standard HDMI-to-HDMI cable. All HD signals are supported, and the output resolution is 1280×720. It also can be used to transmit audio information. This product will make your applications based on BeagleBone board more versatile for different circumstances.


  • Plug and play.
  • Adapter to different input signal.
  • 720P(1280×720) output resolution.


Parameter Value
Input voltage 5V/3.3V
Maxium operating current 80 mA
HDMI version Version 1.2
Maxium Output resolution 1280x720 @60Hz
Audio transmission Available
Chip IT66121 HDMI Framer(Datasheet)

Platforms Supported

Application ideas

You can expand your BeagleBone to more multimedia peripherals such computer monitor, video projector, digital television, or digital audio device.

Hardware Overview

IT66121 HDMI Framer

  • HDMI Transmitter

Cape I2C address Switch

  • To switch between different cape address identifier.


  • EEPROM memory for this cape.

HDMI Connector

Parts list

Parts name Quantity
BeagleBone Green HDMI Cape 1

Getting Started

This part will show you how to start with this product in a few steps.


  • BeagleBone Green board × 1.
  • USB cable (type A to micro type B) × 1.
  • Standard HDMI cable(type A to type A) × 1.

Hardware Connection

  • Step 1. Please follow below picture to connect the hardware.

  • Step 2. Plug USB cable(type C end) to your PC.


  • Step 1. Please download Debian 8.10 2018-02-01 4GB SD SeeedStudio IoT image from
  • Step 2. Please use the Etcher to burn images to SD cards.
  • Step 3. We can see the linux command line on the screen.
  • Step 4. If we want to use the graphic UI. Please follow below instructions to install lxde.
sudo apt-get update 
sudo apt-get install lxde lxde-core lxde-icon-theme

Trouble shooting

  1. No BeagleBone desktop operation system is shown on the computer monitor? Try one of following steps.

    • Power down the monitor and restart it.
    • Press RESET button on BeagleBone Green board.
    • Press POWER button on BeagleBone Green board and then press it again.

  2. The computer mouse does not work(not powered)?

    • Press RESET button on BeagleBone Green board and wait it to launch.
  3. How disassemble BeagleBone Green HDMI Cape quickly?

    • Pull(with your hand) the end with HDMI receptacle out first, then pull the other end out. Repeat previous two steps again if it is necessary.
  4. If the lxde Graphic keeps asking the wicd password, please follow below instructions.

    • Step 1. Please ingore it.
    • Step 2. Open the terminal, run below commands.

    rm /etc/resolv.conf ln -s /run/resolvconf/resolv.conf rm /var/lib/wicd/resolv.conf.orig ln -s /run/resolvconf/resolv.conf /var/lib/wicd/resolv.conf.orig sudo service wicd start sudo reboot

    • Step 3. Please use the wicd graphic tool to connect to wifi.
    • Step 4. We can use wifi, SSH tools.


This video shows how to use BeagleBone Green HDMI Cape to surfing Internet and play audio.


ArduinoWioBeagleBoneRaspberry PiLinkIt ONE


The platforms mentioned above as supported is/are an indication of the module's hardware or theoritical compatibility. We only provide software library or code examples for Arduino platform in most cases. It is not possible to provide software library / demo code for all possible MCU platforms. Hence, users have to write their own software library.

Help us make it better

Welcome to the new documentation system of Seeed Studio. We have made a lot of progress comparing to the old wiki system and will continue to improve it to make it more user friendly and helpful. The improvement can't be done without your kindly feedback. If you have any suggestions or findings, you are most welcome to submit the amended version as our contributor via Github or give us suggestions in the survey below, it would be more appreciated if you could leave your email so that we can reply to you. Happy Hacking!