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hi, i just finish this project !!!i publish the js code on github tomorrowhttps://www.thingiverse.com/thing:2522825
i begin to work on this project : raspberry pi, touchscrren 5'', nodejs, arduino mega, servomotor and spectrophotometer cell (cuvette)i will give you news !!
Thank you for sharing this project ! What do you think about the use of a RGB LED ? (Maybe it's completly stupid...)