ADS1115 not getting initialized

[pranoti]

Hello,

I've connected Arduino Uno with ADS1115. The output shows "Failed to initialize ADS".
I tried the code for esp32 with the same ADS and it works fine. I came across similar questions on the forum, but I still can't solve the issue. I've also connected pull-up resistors for SCL and SDA

THIS IS THE CODE

#include <Adafruit_ADS1X15.h>

Adafruit_ADS1115 ads;  /* Use this for the 16-bit version */
//Adafruit_ADS1015 ads;     /* Use this for the 12-bit version */

void setup(void)
{
  Serial.begin(9600);
  Serial.println("Hello!");

  Serial.println("Getting single-ended readings from AIN0..3");
  Serial.println("ADC Range: +/- 6.144V (1 bit = 3mV/ADS1015, 0.1875mV/ADS1115)");

  ads.setGain(GAIN_ONE);        // 1x gain   +/- 4.096V  1 bit = 2mV      0.125mV

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

void loop(void)
{
  int16_t adc3;
  float volts3;
  
  adc3 = ads.readADC_SingleEnded(3);
  volts3 = ads.computeVolts(adc3);
  
  Serial.print("AIN3: "); Serial.print(adc3); Serial.print("  "); Serial.print(volts3); Serial.println("V");

  delay(1000);
}

Output :

[robtillaart]

1. missing a Wire.begin() in setup
2. call begin() before calling setGain() as object may not be initialized.

And you may always try my library - GitHub - RobTillaart/ADS1X15: Arduino library for ADS1015 = I2C 12 bit ADC and ADS1115 = I2C 16 bit ADC

Another problem might be that you swapped SCL and SDA

[pranoti]

Thank you for replying.

I followed both the steps but it still doesn't work.
I checked the connections thoroughly and they are right.
I went through the library that you provided but I don't see a SingleEnded program?

[jremington]

With a new I2C device, always start with the I2C Address Scanner program.

Check that communications are working, and that the correct I2C address is found (and is used in your program).

[pranoti]

It was showing no device found. I checked the connections, they were fine. I checked the soldering again and that's where the issue was! It works now!

Thank you so much!!

[jremington]

Glad that worked!