ADS1015_Change_Gain_Differential_Input_Combined.ino

/*
  Using the SparkFun Qwiic 12 Bit ADC - 4 Channel ADS1015
  Combined Example Written By: Bobby Chan
  Original Example Written By: Pete Lewis, Original flex-glove library by: Andy England
  SparkFun Electronics
  Modified Date: 2/1/2023
  License: This code is public domain but you can buy me a beer if you use this and we meet someday (Beerware license).

  Feel like supporting our work? Please buy a board from SparkFun!
  https://www.sparkfun.com/products/15334

  This example shows how to output ADC values on one differential input between A0 and A1.
   at default gain setting of 16 

  Hardware Connections and initial setup:
  Plug in your controller board (e.g. IoT RedBoard - ESP32) into your computer with USB cable.
  Connect your Qwiic 12 Bit ADC board to your controller board via a qwiic cable.
  Connect your MIC+ to A0 (e.. AINpos)
  Connect your MIC- to A1(e.g. AINneg)
  Select TOOLS>>BOARD>>"SparkFun ESP32 IoT RedBoard "
  Select TOOLS>>PORT>> "COM 27" (note, yours may be different)
  Click upload, and watch streaming data over serial monitor at 115200.
  It will show the voltage difference between A0 and A1 (also showing negative differences (if present).

*/

#include <SparkFun_ADS1015_Arduino_Library.h> //Click here to get the library: http://librarymanager/All#SparkFun_ADS1015
#include <Wire.h>

ADS1015 adcSensor;

void setup() {
  Wire.begin();
  Serial.begin(115200);
  if (adcSensor.begin() == true)
  {
    Serial.println("Device found. I2C connections are good.");
  }
  else
  {
    Serial.println("Device not found. Check wiring.");
    while (1); // stall out forever
  }

  /*
    ADS1015_CONFIG_PGA_TWOTHIRDS  +/- 6.144v
    ADS1015_CONFIG_PGA_1          +/- 4.096v (used in this example)
    ADS1015_CONFIG_PGA_2          +/- 2.048v
    ADS1015_CONFIG_PGA_4          +/- 1.024v
    ADS1015_CONFIG_PGA_8          +/- 0.512v
    ADS1015_CONFIG_PGA_16         +/- 0.256v
  */
  adcSensor.setGain(ADS1015_CONFIG_PGA_16); // PGA gain set to 16

}

void loop() {
  int16_t input = adcSensor.getDifferential(); // default (i.e. no arguments) is A0 and A1
  // Optional "commented out" examples below show how to read differential readings between other pins
  // int16_t input = adcSensor.getDifferential(ADS1015_CONFIG_MUX_DIFF_P0_N3);
  // int16_t input = adcSensor.getDifferential(ADS1015_CONFIG_MUX_DIFF_P1_N3);
  // int16_t input = adcSensor.getDifferential(ADS1015_CONFIG_MUX_DIFF_P2_N3);

  
  // False print statements to "lock range" on serial plotter display
  // Change rangelimit value to adjust "sensitivity"... not as sophisticated as Pete's example.
  //int rangelimit = 750;
  //Serial.print(rangelimit * -1);
  //Serial.print(",");
  //Serial.print("Differential: ");
  Serial.println(input); //differential output
  //Serial.print(",");
  //Serial.println(rangelimit * 1);
  delay(5); // avoid bogging up serial monitor
}