Bastiaan Nelissen bglnelissen

Using cec-client on a Raspberry Pi

Most modern HDMI connected devices support Consumer Electronics Control (CEC). It allows devices to send commands to each other, typically to get the TV to switch input and control volume. If you have ever turned on a Game Console and had your TV automatically change input to that device you have seen CEC in action. It is very convenient and useful, sort of a universal remote that works.

Every manufacturer seems to have it’s own branding of CEC (e.g. Samsung Anynet+, LG SimpLink, Sharp Aquos Link) but it may need to be enabled. Check your manual for details.

Using a Raspberry Pi connected to a TV that supports CEC, you can use the command line cec-client application to control the inputs and the TV itself. These are notes on how to use cec-client and understand the different options.

	esphome:
	name: rotarybutton
	friendly_name: rotarybutton

	# other configuration snipped...

	binary_sensor:
	- platform: gpio
	name: "Button 1"
	id: "button_1"

	import UIKit

	class ViewController: UIViewController, UITableViewDelegate, UITableViewDataSource {

	@IBOutlet weak var tableView: UITableView!

	override func viewDidLoad() {
	super.viewDidLoad()
	NSLayoutConstraint.activate([
	tableView.topAnchor.constraint(equalTo: view.topAnchor),

	--[[
	Most pure lua print table functions I've seen have a problem with deep recursion and tend to cause a stack overflow when
	going too deep. This print table function that I've written does not have this problem. It should also be capable of handling
	really large tables due to the way it handles concatenation. In my personal usage of this function, it outputted 63k lines to
	file in about a second.

	The output also keeps lua syntax and the script can easily be modified for simple persistent storage by writing the output to
	file if modified to allow only number, boolean, string and table data types to be formatted.

	author: Alundaio (aka Revolucas)

	000000 Officially Xerox
	000001 SuperLAN-2U
	000002 BBN (was internal usage only, no longer used)
	000003 XEROX CORPORATION
	000004 XEROX CORPORATION
	000005 XEROX CORPORATION
	000006 XEROX CORPORATION
	000007 XEROX CORPORATION
	000008 XEROX CORPORATION
	000009 powerpipes?

	--[[ json.lua

	A compact pure-Lua JSON library.
	The main functions are: json.stringify, json.parse.

	## json.stringify:

	This expects the following to be true of any tables being encoded:
	* They only have string or number keys. Number keys must be represented as
	strings in json; this is part of the json spec.

	#!/bin/bash
	#
	# transcode-video.sh
	#
	# Copyright (c) 2013-2015 Don Melton
	#

	about() {
	cat <<EOF
	$program 5.13 of April 8, 2015

	/**
	* Converts an RGB color value to HSL. Conversion formula
	* adapted from http://en.wikipedia.org/wiki/HSL_color_space.
	* Assumes r, g, and b are contained in the set [0, 255] and
	* returns h, s, and l in the set [0, 1].
	*
	* @param Number r The red color value
	* @param Number g The green color value
	* @param Number b The blue color value
	* @return Array The HSL representation

	#!/bin/sh

	###
	# SOME COMMANDS WILL NOT WORK ON macOS (Sierra or newer)
	# For Sierra or newer, see https://github.com/mathiasbynens/dotfiles/blob/master/.macos
	###

	# Alot of these configs have been taken from the various places
	# on the web, most from here
	# https://github.com/mathiasbynens/dotfiles/blob/5b3c8418ed42d93af2e647dc9d122f25cc034871/.osx

Bastiaan Nelissen bglnelissen

Using cec-client on a Raspberry Pi

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