Robin2:
If the user always needs to press 3 buttons it should not be difficult to use your buttons.You need some means to know if the system is waiting for an input.
From that point if a button is pressed save its value and count how many buttons have been pressed.
When the count gets to 3 then you have all the values you need.The complexity arises if the person does not press 3 buttons but leaves the system dangling in an unfinished state. I would deal with that by starting a timer (saving the value of millis() ) when the first button is pressed and if the 3rd button has not been pressed after (say) 5 seconds I would cancel everything and go back to the waiting-for-input state.
That would also deal with the situation where someone accidentally pressed 4 buttons.
...R
Thanks for the reply!
The user will always be pushing 3 buttons, and theres a reset button if the wrong buttons are pressed, which i would use to set the count back to zero.
When you say "save its value" thats where I have trouble, I can assign values to the buttons i just dont know how to save the values!
Thanks
Will