#include <Wire.h>
#include <Adafruit_ADS1X15.h>

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

void setup(void)
{
  Serial.begin(9600);
  
  // Explicitly assign standard ESP32 I2C pins (SDA=21, SCL=22)
  Wire.begin(21, 22); 

  Serial.println("Hello!");
  Serial.println("Getting single-ended readings from AIN0..3");
  Serial.println("ADC Range: +/- 6.144V (1 bit = 0.1875mV/ADS1115)");

  // UNCOMMENTED THIS: Sets the ceiling to 6.144V so 5V inputs don't clip
  ads.setGain(GAIN_TWOTHIRDS);  // 2/3x gain +/- 6.144V  1 bit = 0.1875mV (default)
  
  // COMMENTED THIS OUT: Removed the 4.096V restriction ceiling
  // ads.setGain(GAIN_ONE);        // 1x gain   +/- 4.096V  1 bit = 0.125mV

  if (!ads.begin()) {
    Serial.println("Failed to initialize ADS.");
    while (1);
  }
}

void loop(void)
{
  // 1. Read the first potentiometer (Channel 0)
  int16_t adc0 = ads.readADC_SingleEnded(0); 
  float voltage0 = ads.computeVolts(adc0);

  // 2. Read the second potentiometer (Channel 1)
  int16_t adc1 = ads.readADC_SingleEnded(1); 
  float voltage1 = ads.computeVolts(adc1);

  // 3. Print both values on the same line so they are easy to track
  Serial.print("AIN0 (Pot 1): ");
  Serial.print(voltage0, 2); // Force 2 decimal places
  Serial.print("V | ");
  
  Serial.print("AIN1 (Pot 2): ");
  Serial.print(voltage1, 2); // Force 2 decimal places
  Serial.println("V");

  delay(300); // Small delay to keep the text readable
}