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Research on non-contact measurement technology of liquid concentration based on capacitive sensor
This is a mind map about the research on non-contact measurement technology of liquid concentration based on capacitive sensors. It mainly includes advantages and experiments.
Edited at 2022-05-06 00:11:58- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
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Research on non-contact measurement technology of liquid concentration based on capacitive sensor
- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
- One Hundred Years of Solitude Character Relationship Chart
One Hundred Years of Solitude is the masterpiece of Gabriel Garcia Marquez. Reading this book begins with making sense of the characters' relationships, which are centered on the Buendía family and tells the story of the family's prosperity and decline, internal relationships and political struggles, self-mixing and rebirth over the course of a hundred years.
- Project Management Process Template
Project management is the process of applying specialized knowledge, skills, tools, and methods to project activities so that the project can achieve or exceed the set needs and expectations within the constraints of limited resources. This diagram provides a comprehensive overview of the 8 components of the project management process and can be used as a generic template for direct application.
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- Outline
Research on non-contact measurement technology of liquid concentration based on capacitive sensor
Advantage
Material advantages
Capacitive sensors have simple structure, high sensitivity, good dynamic response characteristics, strong adaptability, It has the characteristics of large anti-overload capability and low price.
Advantages of research methods
Achieving no contact with the solution and no other pollution to the solution Quickly and accurately measure solution concentration in dyeing situations.
experiment
principle
The detection part is composed of an electrode plate device and arithmetic module, coupled with microcontroller control technology and corresponding software programming. It uses the physical property that different solution concentrations can affect the electrolyte to change the dielectric constant, and measures the instantaneous capacitance value through the capacitive sensor, thereby obtaining the measured The dielectric constant of the solution, and then the concentration of the measured solution.
system running
Data acquisition module
sensor
The microcontroller is used to drive the capacitive sensor and receive data from the capacitive sensor
Sensor measurement, CPU calculation and display are performed through program control.
Data processing module
During the testing process, continuous experiments and repeated comparisons of data are required. Carry out mathematical analysis and establish equations based on the data in the table. Use Matlab to obtain the fitting function.
MCU main control unit
display module
OLED display module display
Using an STM32F103 series microcontroller as a microcontroller-based OLED Display terminal core hardware
System software and hardware facilities
hardware
FDC2214 capacitance detection circuit
where C and L are the capacitance and inductance connected to the circuit, which are known
OLED display module circuit
Using an STM32F103 series microcontroller as a microcontroller-based OLED The core hardware of the display terminal, this type of microcontroller can meet the minimum configuration To the performance requirements of OLED display terminals for microcontrollers. Due to the choice of OLED The interface is I²C, so we choose a set of I/O of the microcontroller to simulate the work of I2C mode can meet the display needs
STM32F103 minimum system circuit
software
Sensor measurement, CPU calculation and display are performed through program control.
After the system is powered on, the reset operation is first performed, and then the embedded software FDC2214 performs a reset operation to configure FDC221 via I²C bus transmission parameters, start the system after completing the system configuration, and the capacitive sensor collects The liquid concentration value is converted into a capacitance value, saved to the internal register, and then Through the corresponding instructions, the I²C bus transmission method is used to save the power stored in FDC2214. The capacitance value is sent to the microcontroller STM32F103, and finally the data is processed by the microcontroller. Process, display the obtained liquid concentration value on the OLED screen, and complete the measurement.