1. what is the correct value resistor to use ?
is there a calculation for determining the correct value
So, is there a down-side to using the internal pullups?
You don't choose the voltage to pull to
What choice do you have other then the chip's Vcc voltage with active sink...
The high-voltage pin would either be an input (high-impedance; line pulled-up to 3 volts) or a low output (sink).Is that a problem?
QuoteYou don't choose the voltage to pull toWhat choice do you have other then the chip's Vcc voltage with active sink and source output pins?Lefty
That was my pointBut with external resistors, you can pull to whatever voltage you want
QuoteThat was my pointBut with external resistors, you can pull to whatever voltage you wantBut you missed my point. When would it be proper to ever pull-up a arduino digital output pin to a voltage higher or lower then the Vcc voltage of the chip? Arduino output pins are not open collector type output pins.Lefty
would require external pull-up resistors connected to 3.3V
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