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What is INPUT_PULLUP in Arduino
InputPullupSerial | Arduino Documentation | Arduino Documentation
Digital Input Pull-Up Resistor | Arduino Documentation | Arduino Documentation
![ASK]Need help about interference on internal Pull-Up for multiple button - General Electronics - Arduino Forum](https://europe1.discourse-cdn.com/arduino/optimized/4X/d/c/6/dc6757798fcd6ef787bb52541593439e8d670a86_2_690x435.png "ASK]Need help about interference on internal Pull-Up for multiple button - General Electronics - Arduino Forum")