It's a pull-down resistor. | Hacker News

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		dtgriscom on Aug 15, 2023 \| parent \| context \| favorite \| on: Privacy friendly ESP32 smart doorbell with Home As... It's a pull-down resistor.

dewert on Aug 15, 2023 [–]

I believe there's also an INPUT_PULLDOWN option, at least on some of the pins.

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