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A Pullup Resistor brings a line up to a voltage (Typically VCC), while allowing the line to be pulled low.

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I2C Pulldown Resistor

Usually pullup resistors are needed for i2c but if I have pullups in master and hosts devices and when I add another one device to I2C bus then bus stop working. I cann't remove pullups. … or even resistance regulator to find optimal radio for pullup and pulldown? PS My device is quad with matek 405 ctr. I am adding GPS TS100 mini. I watched a set of videos. …
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