Trouble when connecting limit switch

[hmm1]

Hi! I am trying to connect a limit switch but the output in my serial monitor does not make sense.

Wiring goes from Arduino UNO digital port 2 to limit switch, then from limit switch to 10k ohm resistor, then to Arduino ground.

When the limit switch is connected and I press it i get 0 repeatedly in the serial monitor, but when I release the button the serial monitor alternates between 0 and 1 at seemingly random intervals. Even when i disconnect the switch it still reads lots of 0s and 1s randomly. I would expect it to read either 0 or 1, not both. Is there something wrong with my arduino? Or am i doing something wrong? I have tried different cables, different switches (same brand/type) and different connector/pins.

Here is the code im using :

Kodeutsnittint BUTTON_PIN = 2;

int buttonState =0;

void setup() {

pinMode (BUTTON_PIN, INPUT);

Serial.begin(9600);

}

void loop() {

buttonState = digitalRead(BUTTON_PIN);

Serial.println(buttonState);

}Kodeutsnitt

[Idahowalker]

Floating Inputs and its Mitigating Measure in Arduino

Floating Inputs and its Mitigating Measure in Arduino.

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[LarryD]

@hmm1

pinMode (BUTTON_PIN, INPUT);

Use

pinMode (BUTTON_PIN, INPUT_PULLUP);

[hmm1]

Sorry, will do better on my next post

[hmm1]

This fixed it, thanks!!

[sterretje]

Your topic has been moved to a more suitable location on the forum. Introductory Tutorials is for tutorials that e.g. you write, not for questions. Feel free to write a tutorial once you have solved your problem