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proximity sensor Answered

 I need to build a sensor kits that will be connected on to my midi controller and replace the control knobs. I want to control track volume (on Logic audio) by moving my hand up and down.
any help for cheap solutions?


You would probably need something that varies the control voltage according to the position of the hand relative to a sensor. From there, you have to convert CV to MIDI. I think there is a MIDI interface to the Arduino's that you might be able to use.  You can research things like photosensors based on dimming the light by holding your hand to cover the sensor or something based on the amount of reflected light source.  Roland builds a light beam controller into their synthesizers that is pretty cool.  Good luck.