paper flow

steppers + camera

template matching => threshold + move away first before deciding to look again need for light underneath paper to have enough contrast work with region of interest: when does the paper leave or enter the region of interest?

needed to alter i2c address (by soldering a short circuit connection on pads)

suction

fan beneath the paper problem: turbulent air, not with prototype, yet with final version ==> no major issue

angle

I wanted a steep angle, for a certain visual appeal. problem was that it tore the paper at the notches (it is intended for this of course…). So I had to make the angle less steep and make sure no sharp edges were in the path (smooth sanding to the rescue)