home-assistant.io/source/_components/hdmi_cec.markdown

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layout	title	description	date	sidebar	comments	sharing	footer	ha_category	logo	ha_release	ha_iot_class
page	HDMI CEC	Instructions how to interact with HDMI CEC via Home Assistant.	2016-06-24 19:59	true	false	true	true	Automation	hdmi.png	0.23	Local Push

The CEC component provides services that allow selecting the active device, powering on all devices, and setting all devices to standby. Devices are defined in the configuration file by associating HDMI port number and a device name. Connected devices that provide further HDMI ports, such as Soundbars and AVRs are also supported. Devices are listed from the perspective of the CEC-enabled Home Assistant device. Any connected device can be listed, regardless of whether it supports CEC. Ideally the HDMI port number on your device will map correctly the CEC physical address. If it does not, use cec-client (part of the libcec package) to listen to traffic on the CEC bus and discover the correct numbers.

{% linkable_title CEC Setup %}

{% linkable_title Adapter %}

The computer running Home Assistant must support CEC, and of course be connected via HDMI to a device also supporting CEC. You can purchase a USB CEC adapter to add support if necessary. Note that all Raspberry Pi models support CEC natively.

{% linkable_title libcec %}

libcec must be installed for this component to work. Follow the installation instructions for your environment, provided at the link. libcec installs Python 3 bindings by default as a system Python module. If you are running Home Assistant in a Python virtual environment, make sure it can access the system module, by either symlinking it or using the --system-site-packages flag.

{% linkable_title Symlinking into virtual environment %}

Create a symlink to the cec installation.

$ ln -s /usr/local/lib/python3.4/dist-packages/cec /path/to/your/venv/lib/python3.4/site-packages

For the default virtual environment of a Raspberry Pi All-In-One installation the command would be as follows.

$ ln -s /usr/local/lib/python3.4/dist-packages/cec /srv/hass/hass_venv/lib/python3.4/site-packages

If after symlinking and adding `hdmi_cec:` to your configuration you are getting the following error in your logs, `* failed to open vchiq instance` you will also need to add the user account Home Assistant runs under, to the `video` group. To add the Home Assistant user account to the `video` group, run the following command. `$ usermod -a -G video `

{% linkable_title Testing your installation %}

• Login to Raspberry Pi

ssh pi@your_raspberry_pi_ip

• at the command line type:

echo scan | cec-client -s -d 1

• This will give you the list of devices that are on the bus

opening a connection to the CEC adapter...
requesting CEC bus information ...
CEC bus information
===================
device #4: Playback 1
address:       3.0.0.0
active source: no
vendor:        Sony
osd string:    BD
CEC version:   1.4
power status:  on
language:      ???

Note the address: line above this will be used to configure HA, this address is represented below as 3: BlueRay player

{% linkable_title Configuration Example %}

In the following example, a Pi Zero running Home Assistant is on a TV's HDMI port 1. HDMI port 2 is attached to a AV receiver. Three devices are attached to the AV receiver on HDMI ports 1 through 3.

hdmi_cec:
  devices:
    1: Pi Zero
    2:
      1: Fire TV Stick
      2: Chromecast
      3: Another Device
    3: BlueRay player

{% linkable_title Services %}

{% linkable_title Select Device %}

Call the hdmi_cec/select_device service with the name of the device to select, for example:

{
  "device": "Chromecast"
}

So an Automation action using the example above would look something like this.

action:
  service: hdmi_cec.select_device
    data:
      device: Chromecast

{% linkable_title Power On %}

Call the hdmi_cec/power_on service (no arguments) to power on any devices that support this function.

{% linkable_title Standby %}

Call the hdmi_cec/standby service (no arguments) to place in standby any devices that support this function.

{% linkable_title Useful References %}

• CEC overview
• CEC-o-matic