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controlling 2 stepper motors

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serenity

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Hi,

Im currently working on a school project involving the control of 2 stepper motors using a PIC microcontroller.
I want add buttons for each stepper motor to contrôl directions (left right) and another one for the contrôl mode (half and full stepping mode )
where can I put these buttons on my schématic ?
Thank you!
schématic2.PNG
 

Without sufficient pins left to connect 8 buttons, you obviously need some kind of expansion logic. There are many options, don't know which is easiest to you:
- a serial shift register to read the buttons. Advantage: can be easily expanded to more inputs. Uses shift clock, serial data in and load output. e.g. 74HC165 or CD4021
- an I2C interfaced IO expander
- a 3 to 8 decoder selecting a key and one uP pin to read it back
- an 8-to-1 multiplexer
 

thank you for your answer
if I choose a 8-1 multiplexer how can I connect it to the pic ?
 

3 outputs to select a channel, 1 input to read the selected switch

The 8 switches have to be scanned pericodically by the software.
 

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