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HTU21D
The HTU21D library allows you to connect to a HTU21D humidity and temperature sensor over I2C.
Adafruit sells a nice breakout for the HTU21D: https://www.adafruit.com/products/1899
##Examples
##API
####HTU21D(i2c_bus)
Creates an instance of the HTU21D class using the given I2C bus (I2C1 or I2C2).
An AssertionError will be thrown if no HTU21D is found on the I2C bus.
#####HTU21D.getPressure()
Reads and returns the current relative humidity.
The received value is checked against a CRC and an AssertionError is thrown if it is invalid.
#####HTU21D.getTemp()
Returns current temperature in Celsius.
The received value is checked against a CRC and an AssertionError is thrown if it is invalid.
#####HTU21D.getTempF()
Returns current temperature in Fahrenheit.
The received value is checked against a CRC and an AssertionError is thrown if it is invalid.
#####HTU21D.calculateDewPoint(rh, temp)
Returns current temperature in Fahrenheit.
Calculates and returns the dew point for the given relative humidity and temperature in Celsius.