title: Am I a wizard? An led lights up when my fingers get close
body: <p>I was writing some simple code involving a tilt ball switch, but it didn't end up working right. I messed around with the inputs and outputs and eventually I learned that when I put my fingers near the input pin, the built-in led lit up. I didn't even have to touch anything. Are the input pins just really sensitive to an electric or magnetic field in my fingers?</p>
  
  <p>Here is the code that I was running: <a href="https://i.stack.imgur.com/0PlV4.png" rel="nofollow noreferrer">1</a></p>
  
  <p>When the led built-in was lighting up I only had the Arduino hooked up to a power source. The most logical thing that I can come up with (which is probably wrong) is that my fingers are magnetized which creates a magnetic flux which induces a current. So basically I'm Magneto until somebody tells me what is actually happening.</p>