Intelligent electrical conductivity test system design
Abstract:With the development of society and the increasingly updated scientific and technical requirements, the measurement of conductivity parameters is attracting more and more attention. This paper presents a method based on msp430 single-chip conductivity measurement, and on this basis to add a GPS module, the measurement accuracy of less than 2%. The measurement method is to calculate the conductivity value by dividing the voltage with a known resistor in series, and then measuring the output by adding the selected frequency signal. Signal generator is selected AD9850 module, this module can be programmed to produce different frequencies of the square wave or sine wave, the measurement module is selected ADS1118 module, the accuracy of 16 bits, the measurement is more accurate. The microcontroller reads the temperature information of the DS18B20 module and performs temperature compensation in the program. Finally, the UBLOX-6M-GPS module is used to measure the geographical location of the solution and facilitate the later data analysis.
Key words:Conductivity;Frequency measurement;MSP430;Fixed point iteration method;Temperature compensation
