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what buffer?
the problem is : may i drive the led(commom anod) and read the pin input at the same time? reading the input pin just need take 1us only, but many configuration will make the led not working when i push the button...
:cry:
any suggestion (without use any external IC) to realise that?
now i face a problem,
i no have any extra pin, so i need to drive a 7 segment led(commom anod) and at the same time, i need input for a push button,
tell me how to do...
any suggestion about when i push the button, it will not affect the led either on or off?
pin-->resistor-->led--> +5v...
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