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I am building a flight sim button box and I would like someone to please check my proposed wiring diagram.
I will be using 12 buttons, 4 rotary encoders, each also with a push button and 4 (on)-off-(on) toggle switches as well as one additional toggle switch to use as a modifier for the buttons.
Any comments or suggestions appreciated.
Pins 0 and 1 are used for serial, which could make it harder for debugging.
Unless you use triple throw switch, you don't need both 9 and 8. Not reading a switch closed on 9, means it has to be closed on 8.
I'd swap 0 and A0, so the third rotary encoder has its pins from the same pin-register.
I'd maybe add resistors, so that if I accidentally define a pin as OUTPUT, I don't get a dead short when a button is pressed.
Depending on how many buttons you allow to be pressed at the same time, you might have to add diodes to the buttons to prevent n-key rollover.
To use a multiplexed grid of switches like that you'll need to write code that sets all the columns to open, sets all the input rows to INPUT_PULLUP, drives one column at a time low and scans the rows for low output to figure out which buttons are pressed. (You could reverse the rows and columns, or add external pull down resistors and pull the rows/columns high rather than grounding them, but you get the idea. You'll need to write code to scan the grid of buttons in nested for loops.)
