Adafruit Add-on kits for Raspberry Pi - Adafruit ADA1115, The Adafruit ADA1115 4-Channel ADC Breakout Kit is an ideal solution for microcontrollers without an analog-to-digital converter, or for when you require a higher-precision ADC. This kit provides 16-bit precision at 860 samples/second over I2C and can be configured as 4 single-ended input channels, or two differential channels. As a nice bonus, it even includes a programmable gain amplifier, capable of up to x16, to help boost up smaller signals to the full range. This ADC can run from 2V to 5V power/logic, can measure a large range of signals, and is super easy to use. It is a great general-purpose 16-bit converter. The chip's fairly small so it comes on a breakout board with ferrites to keep the AVDD and AGND quiet. Interfacing is done via I2C. The address can also be changed so you can have up to 4 ADS1115s connected on a single 2-wire I2C bus for 16 single-ended inputs. For a streamlined start, Adafruit has spun up a custo