A simple strategy of development water resistance for water comparison using AVR microcontroller

Abstract

Abstract Quality of water can be determined by measuring water resistance values. The resistance parameter is used as a reference to determine water quality based on physical properties where the minimum value for the clean water category is 333.33 Ω. Therefore we need a measuring device to check the value of water resistance. A voltage divider is a simple circuit that can be used to read water resistance values. In this research, a water resistance measuring instrument has been made with a simple method involving a voltage divider circuit with 1 sensor and 2 resistors installed in series, each resistor has a value of 10 kΩ. The sensor output voltage is in the form of an analog signal converted by a 10-bit ADC by an ATMega16 microcontroller. The DC output voltage of the ADC is entered into the voltage divider formula to obtain the water-resistance value from the sensor probe. With the comparative method of reading the tools between the tools made and the standard tools, a calibration using a simple linear regression method is used with the equation model 2984.783216 + (-0.00187724X). An error of 0.79% was obtained after the device was calibrated. The results of clean water testing for comparison in Perum PKT 2939.35764 Ω and Perum HOP 2940.8132 Ω.