Please help an electronics newbie improve a project! It involves Batman...


hello, have graphite line portrait of batman , 2 questions:

1. using arduino , maxuino, made batman voltage divider , can scrub quote along it. (see attached small video). can suggest way of doing without requiring third wire on finger? thinking capacitance/capsense far i'm aware, unable detect position along line.
[edit: programming bit dirty, wanted see if graphite worked, hence clicks in audio]

2. use capacitance sensor anyway detect user's distance piece , can see how fine capsense library doing programming in max using maxuino. have found trails altered version of firmata incoporates capsense shizzle cannot lay hands on it. leads?
[edit: should note, have ultrasonic distance sensor rather not use in case]

thanks!



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