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添加智能灯固件代码

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kerwincui
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firmware/esp-idf/wumei-smart-firmware/components/sht3x/README.md Normal file
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# SHT3x
- This component will show you how to use I2C module read external i2c sensor data, here we use SHT3x-series temperature and humidity sensor(SHT30 is used this component).
- Pin assignment:
- GPIO21 is assigned as the data signal of i2c master port
- GPIO22 is assigned as the clock signal of i2c master port
- Connection:
* connect sda of sensor with GPIO21
* connect scl of sensor with GPIO22
- SHT3x measurement mode:
* single shot data acquisition mode: in this mode one issued measurement command triggers the acquisition of one data pair.
* periodic data acquisition mode: in this mode one issued measurement command yields a stream of data pairs. when use periodic data acquisition mode, you should send hex code 0xE000 firstly, and send 0x3093 to stop periodic mode.
# Notice
- SHT3x uses 8-bit CRC checksum, you can see `CheckCrc8() `for detail.
- The raw measurement data needs to be convert to physical scale. formulas are shown in `sht3x_get_humiture()`