The digitizizer is based on a Kodak carousel slide projector. It’s fitted with LED strips instead of the original light source, which are used to illuminate the slides themselves. An Arduino ...

Remember slide shows? The ones that used a carousel projector and real slides? [Brian] wanted to bring his slides into the digital age but was spending far too much time scanning in the 35mm relics.

I remember when we put that projector in - six of us had to carry it up the stairs. "But distributors are slowly stopping the production of new films on 35mm, so we have to move with the times.