ADS1115 16 Bit ADC Module Board

The ADS1115 Precision Analog-to-Digital Converter (ADC) Module is a high-resolution, low-power ADC designed for accurately measuring analog signals in microcontroller and embedded-system applications. Based on the ADS1115 16-bit ADC, the module provides significantly higher measurement resolution than the built-in ADCs commonly found on many development boards, making it useful for precision sensor and data-acquisition projects.

The module operates from a wide 2.0V to 5.5V supply range and communicates with a microcontroller through an I²C-compatible serial interface. It provides four single-ended analog inputs or two differential inputs, allowing multiple analog sensors or signal sources to be connected.

An integrated programmable gain amplifier (PGA) allows the input range to be adjusted according to the signal being measured. The module also supports programmable data rates from 8 SPS to 860 SPS, providing flexibility between measurement speed and application requirements.

The ADS1115 includes an internal voltage reference and oscillator, reducing the need for additional external components. Its low-power design supports both continuous and single-shot measurement modes, making it suitable for battery-powered and energy-conscious applications.

Features

• High-resolution 16-bit analog-to-digital converter
• Based on the ADS1115 ADC
• Four single-ended analog inputs
• Two differential input configurations
• Wide supply voltage range of 2.0V to 5.5V
• Low current consumption
• Continuous conversion mode
• Single-shot conversion mode with automatic power-down
• Programmable data rate from 8 SPS to 860 SPS
• Integrated programmable gain amplifier (PGA)
• Internal voltage reference
• Internal oscillator
• I²C-compatible serial interface
• Four selectable I²C slave addresses
• Suitable for precision analog measurements
• Compact and low-power design
• Suitable for Arduino, ESP32, Raspberry Pi, and other microcontroller projects

Specifications

Parameter	Specification
Product Type	Precision Analog-to-Digital Converter Module
ADC IC	ADS1115
Resolution	16-Bit
Number of Channels	4 Single-Ended / 2 Differential
Supply Voltage	2.0V – 5.5V
Data Rate	8 SPS – 860 SPS
Interface	I²C-Compatible
I²C Addresses	4 Selectable Addresses
Gain Control	Programmable Gain Amplifier (PGA)
Reference	Internal Voltage Reference
Oscillator	Internal
Conversion Modes	Continuous / Single-Shot
Comparator	Programmable
Operating Temperature	-40°C to +140°C*

*Refer to the specific ADS1115 IC/module manufacturer’s specifications for the exact operating limits of the supplied module.

Design and Construction

The ADS1115 module is designed as a compact precision ADC interface for systems that require higher-resolution analog measurement. The onboard ADS1115 integrates the ADC, programmable gain amplifier, voltage reference, oscillator, and digital interface into a single solution.

The module provides multiple analog input channels, allowing several sensors or analog sources to be connected without requiring a separate ADC for each signal. The I²C interface minimizes the number of microcontroller pins required for communication.

Its wide 2.0V–5.5V supply range allows the module to be integrated into a variety of embedded systems. The compact design makes it suitable for prototyping, sensor interfaces, data acquisition, and precision measurement applications.

Working Principle

The ADS1115 converts an analog voltage applied to its input channels into a 16-bit digital value. The connected microcontroller communicates with the ADC through the I²C interface and reads the converted digital measurement.

The programmable gain amplifier (PGA) allows the input range to be adjusted so that smaller analog signals can be measured with greater resolution. Depending on the application, the ADC can operate using single-ended or differential measurements.

In continuous mode, the ADC continuously performs conversions at the selected data rate. In single-shot mode, it performs one conversion and automatically enters a low-power state, helping reduce energy consumption.

The onboard reference and oscillator simplify the design by reducing the need for additional external components.

Input Configuration

The ADS1115 provides flexible analog input configurations:

• Four single-ended inputs: AIN0, AIN1, AIN2, and AIN3
• Differential measurements: Two analog inputs can be compared to measure the voltage difference between them

This flexibility makes the module suitable for both individual sensor measurements and differential signal applications.

I²C Communication

The module communicates with a microcontroller using the I²C-compatible serial interface. Multiple address options allow compatible ADS1115 devices to share the same I²C bus when configured appropriately.

Typical connections include:

• VCC – Power supply
• GND – Ground
• SDA – I²C data
• SCL – I²C clock
• AIN0–AIN3 – Analog input channels

Always verify the module’s pin labels and voltage requirements before connecting it to a development board.

Power and Operating Modes

The ADS1115 supports a wide 2.0V to 5.5V supply range, making it compatible with many embedded platforms.

It supports:

• Continuous conversion mode for repeated measurements
• Single-shot mode for on-demand measurements with automatic power-down

The single-shot mode can be particularly useful in battery-powered systems where the ADC does not need to remain continuously active.

Applications

• Precision sensor measurement
• Analog voltage measurement
• Temperature sensing
• Pressure sensors
• Light sensors
• Current and voltage monitoring
• Battery monitoring
• Strain gauge applications
• Industrial data acquisition
• Analog signal measurement
• Audio and signal-processing experiments
• Arduino projects
• ESP32 projects
• Raspberry Pi projects
• Raspberry Pi Pico projects
• IoT sensor systems
• Robotics projects
• Embedded instrumentation
• Laboratory measurement systems
• DIY electronics projects
• High-resolution analog data acquisition

Compatibility

The ADS1115 module can be interfaced with many development platforms that support I²C communication, including:

• Arduino boards
• ESP32
• ESP8266
• Raspberry Pi
• Raspberry Pi Pico
• STM32 boards
• Other I²C-compatible microcontrollers

Software libraries and programming requirements may vary depending on the development platform.

Package Includes

• 1 × ADS1115 16-Bit Precision ADC Module

Product Disclaimer

Product images are for illustrative and representational purposes only. The actual product may vary slightly in colour, PCB finish, component placement, markings, dimensions, or overall appearance depending on the manufacturing batch.

The module may be supplied with either a blue or purple PCB, and the PCB colour will be sent randomly.

Additional cables, sensors, microcontrollers, jumper wires, and other components shown in product images are not included unless specifically mentioned in the package contents.

For reliable operation, ensure that the applied supply voltage and analog input signals remain within the applicable limits of the ADS1115 and the connected system. Always verify the module pinout before making connections.