ADS1115 16-Bit ADC

ADS1115 16-Bit ADC – 4 Channel with Programmable Gain Amplifier

Use SDA/SCL on pins 20 &amp; 21
#include &lt;Adafruit_ADS1015.h&gt;// https://github.com/adafruit/Adafruit_ADS1X15

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

void setup(void)
{
//Serial.println("Getting single-ended readings from AIN0..3");
//Serial.println("ADC Range: +/- 6.144V (1 bit = 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();
}
int16_t read_ads(int ch)
{
int16_t Ads= ads.readADC_SingleEnded(ch);
return Ads;
}