#include <Wire.h>
#include <Adafruit_ADS1015.h>

//Adafruit_ADS1115 ads(0x49);  /* Use this for the 16-bit version */
Adafruit_ADS1015 ads;     /* Use thi for the 12-bit version */


int GAIN[6] = {GAIN_TWOTHIRDS, GAIN_ONE, GAIN_TWO, GAIN_FOUR, GAIN_EIGHT, GAIN_SIXTEEN};
float factor[6] = {         3,        2,        1,       0.5,       0.25,        0.125};

void setup(void) 
{
  Serial.begin(9600);
 
  // 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();
}

  int16_t adc0, adc1, adc2, adc3;
  
void loop(void) 
{


  adc0 = ads.readADC_SingleEnded(0);
  adc1 = ads.readADC_SingleEnded(1);
//  Serial.print("NO2: "); Serial.print(adc0*0.0625); Serial.print("mV, "); Serial.print(((float)(adc0*0.0625 + 74.56)/8.4)*1000. ); Serial.println("ppb"); 

//  Serial.print("CO: "); Serial.print(adc0*0.5); Serial.print("mV, "); Serial.print((float)(430 - adc0*0.5)*0.473); Serial.println("ppb"); 
  Serial.print("NO2: "); Serial.print(adc1*0.25); Serial.print("mV, "); Serial.print((float)(adc1*0.25 - 273)/0.278 ); Serial.println("ppb"); 
//  Serial.print("AIN2: "); Serial.println(adc2);
//  Serial.print("AIN3: "); Serial.println(adc3);
  
  delay(1000);
}