===== Multiplex Switches with one Analog Input ===== {{:arduino_boards:multiplex_switch.jpg?600|}}\\ With an simple [[https://en.wikipedia.org/wiki/Resistor_ladder|R-2R ladder]] one can build an easy multiple switch detection for an Arduino with just one analog input. That way one needs maybe some more components than in a simple resistor network but on the other hand one can just use the simple [[https://www.arduino.cc/reference/en/language/functions/math/map/|map]] and the [[https://www.arduino.cc/reference/en/language/structure/control-structure/switchcase/|switch...case]] function to detect the switch position. And additional multi-switch detection is super easy, too. ---- ==== Paper PCB ==== {{:arduino_boards:multiplexed-buttons_11.jpg?400|}}\\ {{ :arduino_boards:multiplexed-buttons_11.zip |}}\\ ---- ==== Code ==== {{ :arduino_boards:multiplex_button_02.zip |}} ---- ==== Mapping Problem ==== Unfortunately the map function didn't spread the mapped numbers even. Just the last number is assigned to the last mapping number. All the others are equally mapped.\\ [[https://www.best-microcontroller-projects.com/arduino-map.html]] To spread the results equally from 0 to 15 I used in the code the mapping function like that: map(my_value, -32, 992, 0, 16) ---- ==== License ==== The Multiplex Button board was designed by **Wolfgang Spahn** 2020.\\ It is licensed under a [[http://creativecommons.org/licenses/by-nc-sa/4.0/"|Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License]].

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