#include <Adafruit_ADS1X15.h>

#define WAIT_TIME      1000UL  // default wait time each value read
#define ADS_MAX        4       // # of analog input pins of an ADS1115
#define VOLTAGE_RANGE  6.144f  // ADS1115 default gain (+/- 6.144V)
#define CONST_I2C      32768   // a constant value

unsigned long currTime;  // non-blocking timer
Adafruit_ADS1115 adc;
int i;  // loop iterators

void setup() {
  Wire.begin();
  Serial.begin(19200);
  adc.begin();
  currTime = millis();
}

void loop() {
  // TODO: The current reading is too slow for even the arduino's own ide's grapher cannot parse the data in time
  if (millis() - currTime >= WAIT_TIME) {  // non-blocking time delay
  Serial.print("[");
  for (i = 0; i < ADS_MAX; i++) {
    Serial.print(adc.readADC_SingleEnded(i) * VOLTAGE_RANGE / CONST_I2C); // a raw to voltage conversion based from the library's method
    if (i != ADS_MAX - 1) {
      Serial.print(", ");
    }
  }
  Serial.println("]");
  currTime = millis();    
  }
}