Pull-up resistor - why input pin is pulled to ground when the switch is closed? – electronics.stackexchange.com

Pull-up resistor - why input pin is pulled to ground when the switch is closed? – electronics.stackexchange.com

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Let's say 1 is an input pin. So when the switch is "OFF" (open circuit), the output is almost equal to Vcc since there's no current. 1 is pulled to Vcc. When the switch is "ON" (closed circuit), 1 ...

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