SLAAE50A January   2022  – October 2022 MSP430FR2533 , MSP430FR2533

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
  4. 2Basic Knowledge and Principles of Self-Inductive Capacitive Touch
  5. 3MSP430FR2533 Liquid Level Measurement Application
    1. 3.1 System Design
    2. 3.2 Hardware Design
    3. 3.3 Software Design
    4. 3.4 Test Results
  6. 4Conclusion
  7. 5References
  8. 6Revision History

4 Conclusion

This application note proposes a simple liquid level depth measurement system based on MSP430FR2533 capacitive touch MCU, and displays the liquid level height through LCD. It mainly introduces the working principle of capacitive touch and the corresponding software and hardware design. Based on the design, several tests were carried out, including the test of different electrode connections, the test of absolute capacitance and relative capacitance, and the test of software optimization. The test results show that in this application, the software-optimized, single-electrode, and relative capacitance measurement method can achieve better measurement results.

MSP430 family provides other types of MCU to realize liquid level detection. For less I/O ports demand, MSP430FR2512 can implement the required functionality. Also, for specific application, customer need to choose the appropriate system design, electrode connection, and measurement method.