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my own world
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Okay, I've got a 7 segment  led running from a shift register using spi...
It counts from 0 to 9 and starts over

Now I want to add a button to count up or down...

Can I add an analog button to the arduino on another pin
or do I have to put the button on the SPI bus?
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No you don't.

The button to give you some sort of input to the program is nothing to do with the SPI driving the display.
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my own world
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Thank you..
Tim
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