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Hi eb1984,
ClosedCube does have an Arduino library for their HDC1010 board that you may be able to use as example code: https://github.com/closedcube/ClosedCube_HDC1010_Arduino
We would not have much more code for the HDC1010, but if you are interested in potentially upgrading to the HDC2 family (in this case HDC2010), we have many examples. You can generate MCU agnostic C code using our SysConfig tool for the HDC2010 here:
https://dev.ti.com/sysconfig/index.html?product=ascstudio&module=/ti/sensors/humiditysensor/HDC2010
We also have an Arduino example for HDC2010: https://training.ti.com/how-interface-hdc2010-humidity-and-temperature-sensor-arduino-using-i2c
You can also find examples for a specific TI MCU using TI Resource Explorer (please note that HDC2080 code is compatible with HDC2010 as well): https://dev.ti.com/tirex
If you can't upgrade to the HDC2 family, those resources will at least give you an idea of how to use the I2C peripheral on some different MCUs.
Please let me know if you have any more questions.
Best Regards,
Brandon Fisher