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A pull-down resistor brings a line down to a voltage (typically ground potential) when the line isn't being driven to a specific voltage. It prevents the line from "floating" with an unknown voltage on it.

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I2C Pulldown Resistor

Does it make sense to add pulldown resistor to compensate pullups? or even resistance regulator to find optimal radio for pullup and pulldown? PS My device is quad with matek 405 ctr. … I tried 3 GPS (not just TS100) and I pulldown resistor is just another hack I thinking to try and I wonder how common this is and what could be wrong. I am a bit out of budget to get 4th GPS. …
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