Computing humidity conversion data for HCH-1000 sensor

Instructions to calibrate the Capacitive Sense module (CS0) of C8051F996 microcontroller for measuring relative humidity with HCH-1000 sensor.

  1. Sensor calibration: check the CS0D value. Enter the temperature and relative humidity (measured by your reference meter) into the corresponding input fields.
  2. Optional CS0 module calibration: solder 1% tolerance calibration capacitors in the range 220pF - 330pF instead of the humidity sensor and check the corresponding CS0D values. Enter the corresponding data into the bottom input fields.
  3. Click the Compute button.
  4. Replace HUMI_NOM, TEMP_NOM, and CS_NOM values at the top of the code humi4.asm with the computed ones.
  5. Compile the updated code humi4.asm and load it into the microcontroller
Sensor calibration
Humidity Temperature CDC reading
H = % T = °C CS0D = (hex)
 
Optional CS0 module calibration
Cap. value CDC reading
C = pF CS0D = (hex)
C = pF CS0D = (hex)