Controlling the HDMI CEC protocol with minimal hardware

CEC-Tiny-Pro has support for the HDMI CEC protocol, using minimal hardware, running on an ATMEGA processor.

I’ve got myself into HDMI-CEC attempting to control the power state (on/off) of a vintage TV based on the state of a HDMI signal source. That is described in the CEC-Tiny project. This “Pro” version is intended to serve as a generic CEC playground. It can either run as an active CEC node or as a passive sniffer. I find it very useful as a sniffer to debug other CEC devices, as it can be inserted as an “in-the-middle” device, supporting serial terminal as an output.

It’s on GitHub under an MIT open license.

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