Non-Contact Continuous Capacitive Liquid Level Sensing
International Journal of Pure and Applied Mathematics, Volume 119 No. 12 2018, 1921-1930
10 Pages Posted: 20 Aug 2018
Date Written: April 10, 2018
Fluid level in a storage tank is a very significant process which has required to be measured and control in any process industry. The traditional techniques of liquid level computation may be two type direct type and indirect type. The Main aim of the project is to monitor and control the water level at each and every point of the tank using Arduino Uno and FDC1004 capacitance sensor breakout board. The main advantage of this project is that it is non-contact with the liquid and it is accurate in liquid level measurement. This finds its applications in food industry and even fuel tank levelling in auto industry. In this project we have formed the sensor from two conductive copper foils. Both copper foils have the ability to store some electrical charges. These copper foils are adhered to the water bottle. One foil is given a positive potential and the other is given a negative potential or ground. These foils are given potential through the FDC1004 breakout board. This is the capacitance to digital converter (CDC) board, which converts the capacitance value the analog value to digital value. This board consists of two 4:1 multiplexer, a capacitance to digital converter, configuration registers& data registers, and for communication with the micro controller it has a I2C interface. The channel 1 and ground of the board are connected to the two conductive copper foils. The data from the breakout board is send to the arduino through the TWI interface through the SDA and SCL lines of I2C. This arduino micro controller is programmed by arduino IDE and it is programmed in a way such that it monitors and controls the level of the liquid in the tank through the motor which is connected to the arduino through the relay module. The relay module provides the switching action which is necessary to turn on and turn off the motor which controls the liquid level in the tank.
Keywords: Liquid Level Detection, Capacitance to Digital Conversion (CDC), Arduino UNO, Noncontact Capacitive Level Sensor
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