The ADS1015 and ADS1115 are great analog to digital converters that are easy to use with the Raspberry Pi using its I2C communication bus. The ADS1015 is a 12-bit ADC with 4 channels, and the ADS1115 is a higher precision 16-bit ADC with 4 channels. Both have a programmable gain from 2/3x to 16x so you can amplify small signals and read them with higher precision. If you’re looking for a nice step up from the MCP3008 or other simple ADCs, the ADS1x15 series is a great option!
Before you get started be sure to follow the ADS1x15 guide to assemble your ADC board by soldering on headers.
You might also be interested in the datasheets for these chips:
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16 Bit I2C ADS1115 Module ADC 4 channel with Pro Gain Amplifier
For microcontrollers without an analog-to-digital converter or when you want a higher-precision ADC,
the ADS1115 provides 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.
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 be changed to one of four options (see the datasheet table 5)
so you can have up to 4 ADS1115’s connected on a single 2-wire I2C bus for 16 single ended inputs.
Wide supply range: 2.0V to 5.5V
Continuous Mode: Only 150μA
Single-Shot Mode: Auto Shut-Down
Programmable data rate: 8SPS to 860SPS
Internal low-drift voltage reference
I2C interface: Pin-Selectable Addresses
Four single-ended or two differential inputs
This board chip uses I2C 7-bit addresses between 0x48-0x4B