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The SHT15 sensor uses a non-standard serial protocol, which uses a serial clock and bidirectional serial data
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Oh yes sorry about that, the SHT15 doesn't use standard I2C. We are actually using a SHT2x in one of our projects, which does use I2C, and I just assumed the STH1x were the same.
You are write, you will have to write a custom component to access it, or as dave says use bit banged i/o, with PIOs for example.
If you really need the humidity you can try the SHT20 instead, that uses a I2C bus. If you only need temperature there are lots of other I2C sensors, such as the FM75.
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