Anthony posted a tutorial on interfacing HH10D humidity sensor with the Bus Pirate. He did the hard work of finding the calibration data, follow his tutorial and you’ll save time.
HH10D uses a change in capacitance due to humidity to alter the output pin frequency. The calibration data is stored on a I2C EEPROM.
Two modes of the Bus Pirate were used. He set the calibration data using the I2C mode, and then measured the humidity using the frequency probe.
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Hello, is it possible to read HH10D sensor data with the I2C interface on the Raspberry Pi?