Adafruit
ADS1115 16-Bit ADC - 4 Channel with Programmable Gain Amplifier
Add precision analog-to-digital conversion to any microcontroller with the ADS1115 breakout. This 16-bit ADC delivers 860 samples per second over I2C, with f...
Add precision analog-to-digital conversion to any microcontroller with the ADS1115 breakout. This 16-bit ADC delivers 860 samples per second over I2C, with four single-ended or two differential input channels and a built-in programmable gain amplifier (up to 16×) for boosting small signals.
The board runs on 2V to 5V power and logic, and includes ferrites for clean analog supply lines. Up to four ADS1115 boards can share a single I2C bus for 16 single-ended inputs. For faster sampling at lower resolution, consider the ADS1015 12-Bit ADC (3,300 samples/second).
Key Features
- 16-Bit Resolution – High-precision measurements at 860 samples per second
- 4 Channels – Configurable as 4 single-ended or 2 differential inputs
- Programmable Gain Amplifier – Up to 16× gain for small signal measurement
- 2V to 5V Operation – Compatible with both 3.3V and 5V logic
- I2C Interface – Simple two-wire connection with configurable address
- Configurable I2C Address – Up to 4 boards on a single bus (16 inputs total)
- Clean Analog Supply – Onboard ferrites for quiet AVDD and AGND
Ideal For
- Precision sensor measurement and data acquisition
- Adding analog inputs to digital-only microcontrollers
- Voltage and current monitoring
- Multi-channel analog measurement systems
Package Contents
- 1× ADS1115 16-Bit ADC Breakout Board (assembled and tested)
- 1× Header strip
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- ADC
- An analogue-to-digital converter reads a changing voltage and turns it into a number the microcontroller can use. It matters when connecting analogue sensors such as light, sound, or variable-resistor sensors.
- breakout
- A breakout is a small circuit board that makes a tiny or hard-to-solder component easier to connect to with standard pins. It matters because this OLED module can be wired into a microcontroller project without needing to solder directly to the display’s fine contacts.
- Differential input
- A measurement method where the board reads the voltage difference between two input wires instead of measuring one wire compared with ground. This is useful for small sensor signals and noise reduction, but both input voltages still need to stay within the board’s allowed range.
- I2C
- I2C is a two-wire communication bus used by many sensors and small modules. It matters because several I2C devices can share the same two wires, but each device needs a compatible address and your controller must support I2C.
- I2C address
- An I2C address is the number a device uses so a microcontroller can tell it apart from other devices on the same I2C bus. It matters because two devices with the same fixed address may conflict if used together.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- programmable gain
- An adjustable amplification setting inside the ADC that makes small input signals larger before they are measured. It matters because choosing the right gain helps use more of the ADC’s range without overloading the input.
- Programmable gain amplifier
- A built-in amplifier whose gain can be changed in software to make small input signals easier to measure. This matters because choosing the right gain can improve detail for small sensors, but too much gain can make the input range too small.
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Sensors & Input
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