Servo Mounted Phone Tapper
thingiverse
This is a smartphone tapping device attached to a servo horn. Styluses like these [ http://a.co/htD1zzX ] are plugged into one or both of the side holes. The styli should be grounded somehow, I've found that running an unbent paperclip between both styluses seems to work, but I'm sure there's a less awkward way. Customize the spacing based on your needs. Depending on your servo, you might need to change the size of the attachment hole slightly. I put the servo on a lego servo mount to position it, but I think some sort of setup with threaded rods would be better. I use code similar to this with my Arduino to make it work: https://learn.adafruit.com/adafruit-arduino-lesson-14-servo-motors/arduino-code-for-sweep
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