title: I2C chip not showing up
body: <p>Recently I bought a Raspberry Pi (Model B 512MB, Raspbian Wheezy) and three sensors.
  I successfully programmed the first sensor.
  <br>
  But now I did something horrible, I accidentally connected the ground of my BMP085 sensor to the 5V pin on the Raspberry. All the other pins where connected correctly.
  <br>
  I'm now wondering how I can see if I broke the sensor or the gpio. When I try 
  <code>i2cdetect -y 1</code> it only gives me <code>--</code>. Can someone help me?</p>