Capacitive-Based Liquid Level Sensing Sensor Reference Design


Design files


This reference design, which uses FDC1004EVM, provides robust and accurate capacitive-based liquid level sensing. TIDA-00317 demonstrates the sensor design and configuration setup to mitigate parasitic capacitance interference from the system environment.

  • Liquid-level sensing using capacitive sensing technology
  • Reduces parasitic interference from the system environment
  • Rigid-flex circuit allows the sensors to be placed on various surface shapes
  • Liquid height resolution of <1 mm
  • Includes the environmental reference sensor to help compensate for environmental changes
  • Developed to be paried with FDC1004EVM and FDC1004EVM GUI
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A fully assembled board has been developed for testing and performance validation only, and is not available for sale.

Design files & products

Design files

Download ready-to-use system files to speed your design process.

TIDU736A.PDF (942 K)

Reference design overview and verified performance test data


Detailed schematic diagram for design layout and components


Complete listing of design components, reference designators, and manufacturers/part numbers


Detailed overview of design layout for component placement

TIDC895.ZIP (1795 K)

Design file that contains information on physical board layer of design PCB


PCB layer plot file used for generating PCB design layout


Includes TI products in the design and potential alternatives.

MSP430 microcontrollers

MSP430F552825 MHz MCU with 128KB Flash, 8KB SRAM, 12-bit ADC, comparator, DMA, UART/SPI/I2C, USB, HW multiplier

Data sheet: PDF | HTML
Signal conditioners

FDC10044-Ch, 16-bit, capacitance to digital converter with active shield driver

Data sheet: PDF | HTML

Technical documentation

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Type Title Date
* Design guide Capacitive-Based Liquid Level Sending Sensor Reference Design (Rev. A) Mar. 05, 2015
Technical article What are you sensing? A novel approach for capacitive-based liquid-level sensing PDF | HTML Jun. 25, 2015

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