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Many related works can be found at:
http://orangenarwhals.com/hexblog/2019/09/30/HCI-PL-Class-Work/
Our repository can be found at:
https://github.com/L-Zharmukhametova/papersignal
With deploy at:
http://custompapersignals.herokuapp.com/
How to replace with cheaper electronics? Non-trivial
Right: Expensive ! ! ESP8266 ($15)
Difficult to undo glue…
Future work: Takeout box inspired, diecuts