ADS1115 16 Bit ADC Converter for Precision Sensor Measurement and Arduino Applications

ElecSuppliers Part Number GuideOct 01, 2026

Many modern electronic systems rely on sensors to collect information from the real world.

Temperature, pressure, light intensity, battery voltage and other physical signals are usually analog signals. However, microcontrollers such as Arduino, ESP32 and STM32 process digital data.

A device is needed to convert these analog signals into digital information.

The ADS1115 is a precision analog-to-digital converter (ADC) designed for this purpose.

It is widely used in sensor measurement systems because it provides higher measurement resolution than many built-in microcontroller ADCs while using a simple I2C communication interface.

For engineers working on data acquisition and sensor projects, ADS1115 has become a popular solution for improving measurement accuracy.

What Is ADS1115?

ADS1115 is a 16-bit analog-to-digital converter from Texas Instruments.

Its main function is converting analog voltage signals into digital values that a microcontroller can read and process.

A typical measurement system works like this:

Sensor output → ADS1115 → Microcontroller → Data processing

Instead of relying on the internal ADC inside a microcontroller, designers can add ADS1115 as an external measurement device.

This allows greater flexibility when higher resolution or more accurate analog measurement is required.

Why Use ADS1115 Instead of a Microcontroller ADC?

Many microcontrollers already include ADC functions.

For simple applications, the built-in ADC may be enough.

However, when engineers need more stable measurements, external ADC chips become attractive.

The reason is that ADC performance depends on more than just resolution.

Factors such as:

• Noise

• Reference voltage stability

• Analog circuit design

• Sampling accuracy

can affect the final measurement result.

ADS1115 provides a dedicated measurement solution designed specifically for analog conversion.

The Importance of 16 Bit Resolution

The most recognized feature of ADS1115 is its 16-bit resolution.

Higher resolution means the ADC can distinguish smaller voltage changes.

For example, a sensor output that changes only slightly may be difficult for a basic ADC to measure accurately.

A higher-resolution converter allows the system to detect smaller signal variations.

This makes ADS1115 suitable for applications where measurement detail is important.

Examples include:

Sensor monitoring.

Battery voltage measurement.

Precision analog input systems.

Laboratory and testing equipment.

ADS1115 and Arduino Projects

One major reason ADS1115 became popular is its simple connection with Arduino development boards.

Arduino projects often involve sensors.

However, developers sometimes find that the built-in ADC does not provide enough accuracy for their application.

ADS1115 solves this problem by connecting through I2C.

The hardware connection is simple:

Arduino SDA → ADS1115 SDA

Arduino SCL → ADS1115 SCL

After connection, the microcontroller can read converted analog values through software.

This simplicity helped ADS1115 become common in educational projects and prototypes.

Differential Measurement Makes ADS1115 Useful

Unlike many basic ADC solutions, ADS1115 supports differential measurement.

This means it can measure the voltage difference between two input signals rather than only measuring one signal relative to ground.

This feature is useful in applications where:

• Sensor signals are small

• Noise rejection is important

• Relative voltage measurement is required

Differential input capability gives engineers more flexibility when designing measurement circuits.

Common Applications of ADS1115

ADS1115 appears in many systems where accurate analog measurement is needed.

In sensor equipment, it can improve the accuracy of readings from external sensors.

In battery-powered devices, it can monitor voltage levels more precisely.

In industrial monitoring systems, it can collect analog information from different measurement points.

In development projects, it provides a simple way to add high-resolution analog input capability.

ADS1115 in IoT Devices

Many IoT products combine:

Sensors

↓

Microcontroller

↓

Wireless communication

The quality of sensor data directly affects the usefulness of the entire system.

If the original analog measurement is inaccurate, even advanced cloud processing cannot correct the error.

ADS1115 can improve the first step of the data chain by providing more reliable analog conversion.

This makes it useful in:

Environmental monitoring.

Smart agriculture equipment.

Remote measurement devices.

Industrial IoT systems.

I2C Interface Advantage

One important reason ADS1115 is easy to integrate is the I2C interface.

Compared with parallel ADC interfaces, I2C requires fewer connections.

This helps reduce:

PCB routing complexity.

Microcontroller pin usage.

Hardware design difficulty.

For compact electronic products, saving pins is valuable because those pins can be used for other functions.

ADS1115 Compared With Built-In Arduino ADC

Arduino boards commonly include ADC capability.

However, ADS1115 offers advantages when projects require:

Higher resolution.

External precision measurement.

Multiple analog channels.

More consistent measurement performance.

The built-in ADC is suitable for many simple projects.

ADS1115 is often selected when measurement quality becomes more important.

ADS1115 Design Considerations

Using a high-resolution ADC does not automatically guarantee accurate results.

The surrounding circuit design is also important.

The power supply should be stable.

Analog signal paths should avoid unnecessary noise.

Sensor wiring should be carefully designed.

PCB layout can influence measurement quality.

A precision ADC requires a complete precision measurement environment.

ADS1115 Replacement Considerations

When replacing ADS1115, engineers should consider more than resolution.

Important factors include:

Communication interface.

Input configuration.

Voltage range.

Sampling requirements.

Package compatibility.

Software compatibility.

A different ADC may require changes in both hardware and firmware.

Why ADS1115 Has Strong Search Value

People searching ADS1115 usually have a clear technical purpose.

They are often building:

Sensor systems.

Arduino projects.

Measurement equipment.

IoT devices.

Embedded controllers.

This makes ADS1115 a valuable long-tail SEO keyword because the search intent is closely connected to a real engineering requirement.

The Practical Identity of ADS1115

ADS1115 is best understood as a precision measurement bridge between the analog world and digital systems.

Its popularity comes from solving a common embedded design challenge:

How can a microcontroller accurately understand small changes in real-world signals?

With 16-bit conversion capability, simple I2C communication and flexible input options, ADS1115 remains a practical choice for engineers developing sensor-based electronic products.