Analog to Digital Conversion (ADC)

4-channel ADC With Programmable Gain

Adafruit has created two 4-Channel ADC breakouts with fantastic features that will help you digitize nearly any analog signal easy with any microcontroller with I2C capabilities. Adafruit's tutorial was so well done, I don't have anything to add.

Adafruit ADS1115

Adafruit ADS1015

Adafruit tutorial

Adafruit Arduino library

Custom Analog Input FeatherWing

Your Feather or Particle Boron/Argon/Xenon analog input worries are over. This custom extended Featherwing will accept up to two differential analog inputs in the range of +/- 0.256 V to +/- 6.144 V (gain programmable). It is a breakout for the Adafruit 4-Channel ADC With Programmable Gain, products ADS1015 and/or ADS1115 in a FeatherWing format. Differential mode was chosen to provide the best immunitity from electromagnetic noise, and the full 12 bit / 16 bit resolution. The ALRT pin is broken out so you can implement a custom alert when an input threshold is exceeded. And the ADR pin is also broken out so you can program up to four different I2C addresses, allowing up to four of these to be stacked (150µA current consumption per FeatherWing).

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