Video feedback is the recursive effect produced by pointing a camera at a live preview of its own output. In the earliest video recording equipment it was detrimental, potentially leading to issues with pickups or screens. By the 60s it started to get used in psychedelic art. In the time since, it has been used in TV, film, music videos, and other media.

This project allows anyone with a Raspberry Pi, USB webcam, and HDMI monitor to easily experiment with video feedback and other effects to create fun, photos and video.

Parts

• A camera that is supported by the Raspberry Pi. A USB camera will give the most flexibility with its long cord. I used an old Logitech C270, which can still purchased online for fairly cheap. One of the Pi camera modules that connects via ribbon cable will work as too, but maneuverability of the camera is limited by the length and stiffness of the ribbon cable.
• An HDMI display. There are a few small ones to choose from in the shop. It's easy to find USB C powered 10-15" displays with built in kick stands and HDMI online or at electronics stores. I used this white 15" one, it has mini HDMI input which requires an additional adapter.

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