After spending hours trying to combine hall sensors with a keyboard control (and finally realizing that it just doesn’t work) this is the very first functional prototype(using an arduino mega instead). I even got it working with more sensors-but only for couple of hours:-(
Each bird is linked to 2 sensors (one for each slider). The magnet in the slider itself snaps to the magnetic foil around the hall sensor which helps you to adjust both sliders at the same height.
next steps: get the code running again
add a photoconductive cell so images will only be shown if someone touches the slider
image this without the bottom 50cm and you get an impression of the size my final model will have