Reading from Slave device using wire library

[PaulRB]

@andrewkietzman

  Wire.beginTransmission(IC_address);
  Wire.write(0x20);
  Wire.requestFrom(IC_address,1);
  byte sensor0 = Wire.read();
  Serial.println(sensor0);
  Wire.endTransmission()

I think you need to call Wire.endTransmission() before you call Wire.requestFrom().

You don't need to call Wire.endTransmission() after Wire.read().