Led responding to my finger?

Using Arduino Project Guidance
1

Hi guys,
totally new here and to Arduino, this seemed like the place to go for an answer to my weird question.

So the weirdness:
First of, my idea was to let the led respond to the button. Nothing fancy in the code, just hadn't placed the button yet.

What happens however, is that the led responds to my finger hovering over pin 2 (programmed as the button).
Any thoughts on this?

Here is the link to a youtube movie in which I show the problem. The code is under there.

int led = 13;
int button = 2;

void setup() {
// initialize the digital pin as an output.
pinMode(led, OUTPUT);
pinMode(button, INPUT);
}

void loop() {
int sensorValue = digitalRead(button);
if(sensorValue == 1){
digitalWrite(led, HIGH);
} else {
digitalWrite(led, LOW);
}
}

Thanks in advance!
Cheers

2

Floating input.

3

Thanks for the reaction, and indeed that appears to have been the problem, thanks AWOL! :*

4

That is exactly the basis for the capacitive sensing/ measuring or proximity sensing aplications - and what I intend to use for my house light switches.

So - what you need to do for the button, is to set it as "INPUT_PULLUP" instead of just "input", and connect your button from that pin to ground.