#include <Arduino.h>

#include <Wire.h>

#include <ADS1115.h>

// Single converters, either single ended of differential

// Manual for library: http://lygte-info.dk/project/ADS1115Library%20UK.html

// By HKJ from lygte-info.dk

ADS1115 adc;

float a0,a3,aph,vph;

void setup() {

Serial.begin(9600);

Wire.begin();

adc.setSpeed(ADS1115_SPEED_16SPS);

}

void loop() {

a0=adc.convert(ADS1115_CHANNEL0, ADS1115_RANGE_6144);

a3=adc.convert(ADS1115_CHANNEL3, ADS1115_RANGE_6144);

//Serial.print("Value on input #0 mv ");

//Serial.println(a0*0.1875);

//Serial.print("Value on input #3 mv ");

//Serial.println(a3*0.1875);

vph=(float)(a0/a3)*5*2/3 ;

Serial.print("Real Value ");

Serial.println((float)(a0/a3)*5*2/3 );

aph=(-5.7 * vph + 21.34);

//Serial.print("Value on input #0 is: ");

//Serial.println((float)(a0/a3)*5);

//Serial.print("Value on input #3 is: ");

Serial.print("pH adalah :");

Serial.println(aph);

Serial.println("");

Serial.print("A0 ");

Serial.println((float)a0);

Serial.print("A3 ");

Serial.println((float)a3);

// Serial.print("Value between input #2 and #3 is: ");

// Serial.println(adc.convert(ADS1115_CHANNEL23, ADS1115_RANGE_6144));

Serial.println();

delay(1000);

}