Interfacing ADS1118 16-Bit ADC Module with Arduino

/*
Modify on May 16, 2021
  Modify by MohammedDamirchi base of https://github.com/denkitronik/ADS1118
  
Home

*/


/**
*  Example for Arduino Library for Texas Instruments ADS1118 - 16-Bit Analog-to-Digital Converter with 
*  Internal Reference and Temperature Sensor
*  
*  @author Alvaro Salazar <[email protected]>
*  http://www.denkitronik.com
*
*/

#include "ADS1118.h"
#include <SPI.h>

//Definition of the Arduino pin to be used as the chip select pin (SPI CS pin). Example: pin 5
#define CS 10

//Creating an ADS1118 object (object's name is ads1118)
ADS1118 ads1118(CS);


void setup(){
    Serial.begin(115200);
    ads1118.begin(); //Initialize the ADS1118. Default setting: PULLUP RESISTOR, ADC MODE, RATE 8SPS, SINGLE SHOT, ±0.256V, DIFFERENTIAL AIN0-AIN1

    /* 
     *  EXAMPLES:
     *  The lines above in this method are needed only if you want to change the default setting. Use them to fit your needs
     *  If you need to take care of noise and the ENOB (Effective Number of Bits) see the tables at the end of this file
     */

    /* Changing the sampling rate. 
       Available values: RATE_8SPS, RATE_16SPS, RATE_32SPS, RATE_64SPS, RATE_128SPS, RATE_250SPS, RATE_475SPS, RATE_860SPS */
    ads1118.setSamplingRate(ads1118.RATE_16SPS);             //Using the setter method to change the sampling rate
    //ads1118.configRegister.bits.rate=ads1118.RATE_8SPS;   //Driving the config register directly. Uncomment if you want to use this way

    /* Changing the input selected. 
       Available values: Diferential inputs: DIFF_0_1, DIFF_0_3, DIFF_1_3, DIFF_2_3. 
                         Single ended input: AIN_0, AIN_1, AIN_2, AIN_3*/
    ads1118.setInputSelected(ads1118.DIFF_0_1);             //Using the setter method to change the input selected
    //ads1118.configRegister.bits.mux=ads1118.DIFF_0_1;     //Driving the config register directly. Uncomment if you want to use this way

    /* Changing the full scale range. 
       Available values: FSR_6144 (±6.144V)*, FSR_4096(±4.096V)*, FSR_2048(±2.048V), FSR_1024(±1.024V), FSR_0512(±0.512V), FSR_0256(±0.256V).
       (*) No more than VDD + 0.3 V must be applied to this device. */
    ads1118.setFullScaleRange(ads1118.FSR_0256);            //Using the setter method to change the full scale range
    //ads1118.configRegister.bits.pga=ads1118.FSR_0256;     //Driving the config register directly. Uncomment if you want to use this way

    
    /* Setting to continuous conversion mode */
    ads1118.setContinuousMode();                            //Using the setter method to set it to continuous mode
    //ads1118.configRegister.bits.operatingMode=CONTINUOUS; //Driving the config register directly. Uncomment if you want to use this way

    /* Setting to single shot conversion mode */
    ads1118.setSingleShotMode();                            //Using the setter method to set it to "single shot conversion and power down" mode
    //ads1118.configRegister.bits.operatingMode=SINGLE_SHOT;//Driving the config register directly. Uncomment if you want to use this way

    /* Disabling the pull-up resistor */
    ads1118.disablePullup();                                //Using the setter method to disable the pull-up resistor in Dout
    //ads1118.configRegister.bits.pullUp=PULLUP;            //Driving the config register directly. Uncomment if you want to use this way

    /* Enabling the pull-up resistor */
    ads1118.enablePullup();                                 //Using the setter method to enable the pull-up resistor in Dout
    //ads1118.configRegister.bits.pullUp=NO_PULLUP;         //Driving the config register directly. Uncomment if you want to use this way
}


void loop(){
//    Serial.println(String(ads1118.getTemperature(),6)+" C"); //Getting temperature
    Serial.println(String(ads1118.getMilliVolts(),10)+"mV"); //Getting millivolts measured in the input selected
    
    //Serial.println(String(ads1118.getMilliVolts(ads1118.DIFF_0_1),10)+"mV"); //Specifying the input to be selected
    
    delay(200); //You can use a delay to save power. The ADS1118 will be in power down state during all the delay time. Optional
    
}

/*
              Table 1. Noise in μVRMS (μVPP) at VDD = 3.3 V   [1]
                DATA RATE FSR (Full-Scale Range)
  (SPS) ±6.144 V        ±4.096 V     ±2.048 V       ±1.024 V        ±0.512 V        ±0.256 V
  8     187.5 (187.5)   125 (125)    62.5 (62.5)    31.25 (31.25)   15.62 (15.62)   7.81 (7.81)
  16    187.5 (187.5)   125 (125)    62.5 (62.5)    31.25 (31.25)   15.62 (15.62)   7.81 (7.81)
  32    187.5 (187.5)   125 (125)    62.5 (62.5)    31.25 (31.25)   15.62 (15.62)   7.81 (7.81)
  64    187.5 (187.5)   125 (125)    62.5 (62.5)    31.25 (31.25)   15.62 (15.62)   7.81 (7.81)
  128   187.5 (187.5)   125 (125)    62.5 (62.5)    31.25 (31.25)   15.62 (15.62)   7.81 (12.35)
  250   187.5 (252.09)  125 (148.28) 62.5 (84.03)   31.25 (39.54)   15.62 (16.06)   7.81 (18.53)
  475   187.5 (266.92)  125 (227.38) 62.5 (79.08)   31.25 (56.84)   15.62 (32.13)   7.81 (25.95)
  860   187.5 (430.06)  125 (266.93) 62.5 (118.63)  31.25 (64.26)   15.62 (40.78)   7.81 (35.83)

  
      Table 2. ENOB from RMS Noise (Noise-Free Bits from Peak-to-Peak Noise) at VDD = 3.3 V
                DATA RATE FSR (Full-Scale Range)
  (SPS)   ±6.144 V    ±4.096 V   ±2.048 V     ±1.024 V    ±0.512 V    ±0.256 V
  8       16 (16)     16 (16)    16 (16)      16 (16)     16 (16)     16 (16)
  16      16 (16)     16 (16)    16 (16)      16 (16)     16 (16)     16 (16)
  32      16 (16)     16 (16)    16 (16)      16 (16)     16 (16)     16 (16)
  64      16 (16)     16 (16)    16 (16)      16 (16)     16 (16)     16 (16)
  128     16 (16)     16 (16)    16 (16)      16 (16)     16 (16)     16 (15.33)
  250     16 (15.57)  16 (15.75) 16 (15.57)   16 (15.66)  16 (15.96)  16 (14.75)
  475     16 (15.49)  16 (15.13) 16 (15.66)   16 (15.13)  16 (14.95)  16 (14.26)
  860     16 (14.8)   16 (14.9)  16 (15.07)   16 (14.95)  16 (14.61)  16 (13.8)
  
  
  [1] Texas Instruments, "ADS1118 Ultrasmall, Low-Power, SPIâ„¢-Compatible, 16-Bit Analog-to-Digital 
  Converter with Internal Reference and Temperature Sensor", ADS1118 datasheet, SBAS457E [OCTOBER 2010–REVISED OCTOBER 2015]. 
  
  Note: This information is taken from http://www.ti.com
        Copyright © 2010–2015, Texas Instruments Incorporated
*/