There’s plenty of literature on HDMI-CEC out there on the internet, so we won’t go into the details here – but in a nutshell HDMI cables are not one-way like VGA back in the day, it’s a two way cable that allows the video player to send messages to the TV and vice-versa. However these options are either vendor-dependent (or even worse – firmware version dependent) or are a bit clunky to setup and require line-of-sight. you could hook into your TV’s API if it has one, or go old-school and use actual infrared to control your TV just like your remote control does – using some very cheap hardware and LIRC on the raspberry PI. You have several options when it comes to controlling your TV from the raspberry pi. I don’t think this point is very important as i’ll discuss later – we’re including it here for completeness. The raspberry pi also needs a connection to the internet. In our case, the Raspberry Pi is loaded with OSMC / Kodi. A raspberry pi connected via HDMI to the TV.The equipment used in this project – apart from Alexa – were the following:
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