Low-power and high-precision capacitive sensor chip FDC2214 is used

and a new dryer moisture real-time detection system is proposed based on this chip.The system uses STM8 as the main control chip

uses the I~2C interface to read the capacitance value of the square capacitive sensor through FDC2214

and adds the K-type thermocouple to temperature compensation of the system.The information is real-time using Modbus-RTU protocol and RS—485 circuit

uploaded to the host computer to display and record into a table. After actual field testing

the average error is controlled within 0.5 %

which meets the actual use requirements.