Problems with a pull up

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hi there guys.

the problem don't know how solve next:

im controling microcontroler arduino (stepper driver a4988)  , need that microcontroler reads high level until set high 1 of arduino pins (is must read high begining, when circuit powered on) , when decide how swich level low.

i don't know if explained self.

please me gods of electronics

maybe need use 'pull-up resistor' @ input second micro-controller. 1 kohm pull-up resistor connected between pin , 5v supply.

with pull-up resistor, pin stay 'high'. , other devices (like arduino) able pull pin low (or high) without causing problems - ie. no short circuit problems etc.

also....... arduino has software configurable pull-up resistor option. arduino side, enable arduino's own pull-up resistor (at own pin). basically, have pull-up resistor on arduino .... , pull-up resistor on other micro-controller.


Arduino Forum > Using Arduino > General Electronics > Problems with a pull up


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