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

3.2 Hardware Design

The hardware of this design mainly includes power supply, MCU, LCD display, and communication interface. The power supply converts 5-V USB to 3.3 V for the MCU. Figure 3-3 shows the design of the MCU and peripheral circuits. Figure 3-4 shows the LCD design. Communication protocol uses I2C and UART.

GUID-30E019DE-6992-4044-BA10-D6FABF64C49A-low.png Figure 3-3 Schematic Diagram of MSP430FR2533
GUID-BF4AB295-7888-42DB-8C5F-1E5B96A2F819-low.png Figure 3-4 Schematic Diagram of LCD

Figure 3-5 shows the 3D PCB. Three electrodes are designed in this circuit, which are respectively used for environmental calibration, actual liquid level measurement and liquid level alarm prompt.

GUID-2E5A4E56-42EB-4D6C-8A1E-CB65CF3ECBC0-low.jpg Figure 3-5 PCB and Circuit Board of Liquid Level Measurement Application