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arduino_boards:multiplex_switches [2020/03/30 22:55] admin [Mapping Problem] |
arduino_boards:multiplex_switches [2020/06/11 22:13] |
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| - | ===== Multiplex Switches with one Analog Input ===== | ||
| - | {{:arduino_boards:multiplex_switch.jpg?600|}}\\ | ||
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| - | With an simple 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. | ||
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| - | ---- | ||
| - | ==== Paper PCB ==== | ||
| - | {{:arduino_boards:multiplexed-buttons_11.jpg?400|}}\\ | ||
| - | {{ :arduino_boards:multiplexed-buttons_11.zip |}}\\ | ||
| - | |||
| - | ---- | ||
| - | ==== Code ==== | ||
| - | {{ :arduino_boards:multiplex_button_02.zip |}} | ||
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| - | ---- | ||
| - | ==== Mapping Problem ==== | ||
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| - | 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]] | ||
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| - | To spread the results equally from 0 to 15 I used in the code the mapping function like that: | ||
| - | map(my_value, -30, 981, 0, 16) | ||
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| - | ---- | ||