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#include <LiquidCrystal.h>    // include Arduino LCD library
 
// LCD module connections (RS, E, D4, D5, D6, D7)
LiquidCrystal lcd(2, 3, 4, 5, 6, 7);
 
void setup(void) {
  lcd.begin(16, 2);           // set up the LCD's number of columns and rows
  lcd.setCursor(0, 0);
  lcd.print("RMS Voltage:");
  analogReference(INTERNAL);  // set ADC positive reference voltage to 1.1V (internal)
}
 
// get maximum reading value
uint16_t get_max() {
  uint16_t max_v = 0;
  for(uint8_t i = 0; i < 100; i++) {
    uint16_t r = analogRead(A3);  // read from analog channel 3 (A3)
    if(max_v < r) max_v = r;
    delayMicroseconds(200);
  }
  return max_v;
}
 
// main loop
void loop() {
 
  char buf[10];
  // get amplitude (maximum - or peak value)
  uint32_t v = get_max();
  // get actual voltage (ADC voltage reference = 1.1V)
  v = v * 1100/1023;
  // calculate the RMS value ( = peak/√2 )
  v /= sqrt(2);
 
  sprintf(buf, "%03u Volts", v);
  lcd.setCursor(0, 1);
  lcd.print(buf);
 
  delay(100);
 
}
 
// end of code.

#include <Adafruit_ADS1X15.h>

Adafruit_ADS1115 ads;  /* Use this for the 16-bit version */
//Adafruit_ADS1015 ads;     /* Use this for the 12-bit version */

void setup(void)
{
  Serial.begin(9600);
  Serial.println("Hello!");
  
  Serial.println("Getting differential reading from AIN0 (P) and AIN1 (N)");
  Serial.println("ADC Range: +/- 6.144V (1 bit = 3mV/ADS1015, 0.1875mV/ADS1115)");
  
  // The ADC input range (or gain) can be changed via the following
  // functions, but be careful never to exceed VDD +0.3V max, or to
  // exceed the upper and lower limits if you adjust the input range!
  // Setting these values incorrectly may destroy your ADC!
  //                                                                ADS1015  ADS1115
  //                                                                -------  -------
  ads.setGain(GAIN_TWOTHIRDS);  // 2/3x gain +/- 6.144V  1 bit = 3mV      0.1875mV (default)
  // ads.setGain(GAIN_ONE);        // 1x gain   +/- 4.096V  1 bit = 2mV      0.125mV
  // ads.setGain(GAIN_TWO);        // 2x gain   +/- 2.048V  1 bit = 1mV      0.0625mV
  // ads.setGain(GAIN_FOUR);       // 4x gain   +/- 1.024V  1 bit = 0.5mV    0.03125mV
  // ads.setGain(GAIN_EIGHT);      // 8x gain   +/- 0.512V  1 bit = 0.25mV   0.015625mV
  // ads.setGain(GAIN_SIXTEEN);    // 16x gain  +/- 0.256V  1 bit = 0.125mV  0.0078125mV
  
  ads.begin();
}

void loop(void)
{
  int16_t results;
   int16_t results2;
  
  /* Be sure to update this value based on the IC and the gain settings! */
 //float   multiplier = 3.0F;    /* ADS1015 @ +/- 6.144V gain (12-bit results) */
 float multiplier = 0.1875F; /* ADS1115  @ +/- 6.144V gain (16-bit results) */

  results = ads.readADC_Differential_0_1();  
    results2 = ads.readADC_Differential_2_3();  
  Serial.print("Differential: "); Serial.print(results); Serial.print("("); Serial.print(results * multiplier); Serial.println("mV)");
   results = ads.readADC_Differential_0_1(); 
 //Serial.print("Differential2: "); Serial.print(results2); Serial.print("("); Serial.print(results2 * multiplier); Serial.println("mV)");
   //results2 = ads.readADC_Differential_2_3(); 
  delay(1000);
}