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Comment by yegle | Hacker News Reader

I think the standard control for TV is the RS-232C port on the TV.

https://community.home-assistant.io/t/serial-projector-contr... from a quick search.

One of the meeting rooms here at work has a couple of big panels for displaying presentations, and they're regularly misinterpreting noise on some line or other and changing their brightness/contrast/etc settings. It's highly annoying. I imagine there's some kind of data line plugged into the TVs which is picking up interference and causing them to freak out.

HDMI CEC could do something similar as well.

I inherited an old Sharp LCD TV that has a serial port. I did some digging and discovered I can power it on and off thru the serial port (amongst other commands). It serves a role in my home where it needs to be on part of the day. Turning it on and off via serial is very, very nice.

I'm surprised we haven't seen a cheap, USB powered Bluetooth RE-232C dongle for home assistant yet.

Esphome+hdmi breakout board+llm (or use an existing project like [0])

[0] https://github.com/Palakis/esphome-native-hdmi-cec

Say if we have a pi laying around, could we emulate this?

I guess we could.

Using a whole Raspberry Pi seems like overkill, though: Support for a wide variety of common USB serial chips is already built into esphome. https://esphome.io/components/usb_uart/

Just wire it up with a cheap dev board, build a firmware image for it, and that end of things is... done, right?

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