Description

ADS1115 A/D Converter - Qwiic Ready

The ADS1115 analog-to-digital converter provides high-precision, 16-bit precision at 860 samples/second over I2C. The chip can be configured as 4 single-ended input channels, or two differential channels. As a nice bonus, it even includes a programmable gain amplifier, up to x16, to help boost up smaller single/differential signals to the full range. We like this ADC because it can run from 2V to 5V power/logic, can measure a large range of signals and its super easy to use, and is Qwiic ready. It is a great general purpose 16 bit converter.

Quick Spec

Supply: 2.0 - 5.5V
Qwiic Ready Connectors
Analog Channels: 4
Low Current Consumption: 150µA Single-Shot Mode
Data Rate: 8 to 860 SPS
Interface: I2C 7-bit addresses between 0x48-0x4B
Dimensions: 25.2 x 17.8mm

Resources

Compatible with Adafruit Libraries
Getting Started

I2C Addressing

The ADS11x5 chips have a base 7-bit I2C address of 0x48 (1001000) and a clever addressing scheme that allows four different addresses using just one address pin (named ADR for ADdRess). To program the address, connect the address pin as follows:

0x48 (1001000) ADR - GND
0x49 (1001001) ADR - VDD
0x4A (1001010) ADR - SDA
0x4B (1001011) ADR - SCL

Code Example

#include <Wire.h>
#include <Adafruit_ADS1015.h>
 
Adafruit_ADS1015 ads1015;         //Default Address (0x48)
 
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.begin();
}
 
void loop(void)
{
  int16_t adc0, adc1, adc2, adc3;
 
  adc0 = ads1015.readADC_SingleEnded(0);
  adc1 = ads1015.readADC_SingleEnded(1);
  adc2 = ads1015.readADC_SingleEnded(2);
  adc3 = ads1015.readADC_SingleEnded(3);
  Serial.print("AIN0: "); Serial.println(adc0);
  Serial.print("AIN1: "); Serial.println(adc1);
  Serial.print("AIN2: "); Serial.println(adc2);
  Serial.print("AIN3: "); Serial.println(adc3);
  Serial.println(" ");
  
  delay(1000);
}