RC Oscillator Capacitive Sensing Controller

The system utilizes a 555 timer–based RC oscillation circuit for capacitance measurement, enabling reliable detection and monitoring of capacitance changes. Measurement data is processed by an ESP32 controller equipped with Wi-Fi connectivity, allowing real-time transmission of sensor data to a cloud platform for remote access and monitoring.

The control box provides a user-friendly configuration interface that supports network setup, location information configuration, and MQTT communication settings, simplifying deployment and integration into IoT applications.

Monitoring and data visualization are performed through the ExoSense platform, where measured values can be displayed in multiple formats according to application requirements. Users can customize the display as text, relative humidity percentage (%RH), or calibrated engineering units based on actual measurement scales.

The LED on the control unit provides a quick visual indication of the system status:

• Initial Power-Up
  The LED turns on once to indicate normal power supply, then turns off for approximately 20 seconds while the device establishes a network connection.
• Normal Operation
  After successfully connecting to Wi-Fi or entering AP (Access Point) mode, the LED flashes at a constant rate.
• LED Status Indicator
  A steady, periodic LED flashing pattern indicates that the system is operating normally.
• Calibration Mode
  When the Calibration button is pressed, the system performs zero-point calibration. During this process, the LED flashes at a faster rate while 30 calibration cycles are executed. Upon completion, the LED returns to its normal flashing pattern.
• System Reboot
  When the Reboot the System button is pressed, the LED turns off for approximately 20 seconds while the device reconnects to the network. Once the connection is established, the LED resumes flashing at a constant rate.

• Control Unit
• Product User Manuel