Ambilight System for Every Input Connected to Your TV. WS2812B Arduino UNO Raspberry Pi HDMI (Updated 12.2019) : 12 Steps (with Pictures) - Instructables
From the Forums: Using xbee to remote-control an HDMI switch « Adafruit Industries – Makers, hackers, artists, designers and engineers!
Arduino HDMI Shield - YouTube
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Amazon.com: Arduino Compatible Base Board Compatible with Raspberry Pi Compute Module 4 HDMI Video Supports 4K 30fps Output USB 2.0 Type A M.2 Slot : Electronics