Input keep saying changing

Using Arduino Installation & Troubleshooting
#1

Hi,

I'm having an issue where the input from a pin keeps changing between 1 and 0 even though I am not pushing the button. I've tried switching the wires and the button. Am I doing something wrong? or is something broken?

Thanks in advance,

I have it wired like this:

1215×1068 153 KB

I'm running this code:
void setup() {
Serial.begin(9600);
pinMode(2, INPUT);
}

void loop() {
Serial.print(digitalRead(2));
delay(200);
}

I get this output:
1111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000111111111111111111111111111111111111100000000000000000000000

#2

Looks like a floating input

#3

Thanks,

pinMode(pin, INPUT_PULLUP );

This fixed my issue

#4