For microcontrollers that have no built-in analog-to-digital converter or for higher-precision ADC, this ADS1115 is the ideal solution. It provides 16-bit precision at 960 samples / second over I2C.

It has four input channels that can be configured as 4 single-ended input channels, or two differential channels. The module can operate between 2V and 5V, can measure a wide range of signals and is very easy to use.

The chip is small and comes with ferrites to reduce noise. Communication is via I2C interface. The address can be configured to one of four options (datasheet Table 5) so you can connect up to 4 ADS1115 modules to a single I2C bus for 16 single ended inputs.

Specifications

• Power Supply: 2 V to 5.5 V
• Low Current Consumption: 150 μA
• Internal oscillator
• Internal PGA
• Internal LOW-VOLTAGE DRIFT REFERENCE
• I2C interface
• Programmable comparator
• 7-bit I2C interface between 0x48 and 0x4B address selectable by jumpers

Connecting with Arduino is made according to the following images:

To start, we have sample code for both the Raspberry Pi ( Adafruit Pi Python library ) and for Arduino ( ADS1115 Arduino library ). Just plug the ground to GND, VDD to power supply and the SCL / SDA to I2C ports of the microprocessor and run code from example.

For more details check the attached datasheet