fastbee/firmware/esp-idf/wumei-smart-firmware/components/sht3x

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()