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I'm looking to use the WeatherShield to build a weather station. However, I'd like to mount the Arduino in an enclosure inside a shed so I'll need an external temp/humidity sensor. Weather proofing the sensor is no problem, however, I'm wondering if I can simply attach a breakout board sensor such as the Si7021 breakout to the I2C bus to and grab the temperature/humidity from there. I'm assuming it's possible, but wanted to make sure there wasn't something I'm missing.