ADS1115 - ADC converter - 4 channel, 16bits - I2C

4 channels ADC converter with programmable gain amplifier

This breakout will come just in time for micro-controllers that don't have analog-to-digital converters or when you need a converter with increased accuracy. The ADS1115 has a 16-bit precision and is capable of performing 860 samples per second via the I2C bus. 

The chip can be configured as:

• 4 simple analog inputs (4 channels)
• or 2 differential channels (the differential channels are, for example, used for the measurement of voltage across a current sensor resistor as on INA219). 

In super bonus, this circuit also includes a programmable gain amplifier, up to x16, handy for measuring low signals (or low differential variations) over the full range of sampling.

This converter really has something to be loved because: 

• It can work with a supply/logic voltage from 2V to 5 volts (so Arduino, Trinket, Flora, Due, Raspberry-Pi, etc) 
• It is able to measure a wide variety of signals
• It is super easy to implement.

This is a 16-bit general purpose converter really great.

The integrated circuit being really small, it is mounted on a Breakout with ferrites to maintain AVDD and AGND stable. Interfacing is done using the I2C bus.
The I2C address is modifiable among the 4 available (see data sheet, table 5), which allows to connect up to 4 ADS1115 converters on a simple I2C bus to add 16 precision analog inputs. 

Technical details

• Wide power supply range: 2.0V to 5.5V
• Low current consumption:
  • only 150µA in continuous mode
  • Automatic shutdown in Single-Shot Mode (Auto Shut-Down)
• Programmable acquisition speed: from 8 to 860 sampling per second.
  (Programmable data rate: 8SPS to 860SPS)
• INTERNAL LOW-DRIFT VOLTAGE REFERENCE
• Intern Oscillator
• Intern PGA
• I2C Interface: address selectable with weld jumper.
• 4 simple analog inputs OR 2 differential inputs
• Programmable comparator
• Data sheet

Connect

This breakout is very simple to use.

Connect:

• GND on the mass,
• VDD on the supply voltage of your logic (5V for Arduino, 3.3V for Raspberry-Pi) 
• SCL/SDA on the I2C bus of your micro-controller

Then run the sample code (see tutorial section below) to start reading the data.