2Pcs ADS1115 16-Bit 4-Channel ADC
5.0Editor score
Two complete ADC modules
16-bit conversion resolution
Seven selectable input ranges
Configurable I2C addresses
In this guide
An Arduino ADC Board adds accurate analog-to-digital conversion to development boards that primarily handle digital signals. A good module makes it easier to measure sensor outputs, monitor voltages, collect experimental data, and build responsive control systems. The most useful choice depends on resolution, channel count, gain, interface, and the voltage range your sensors require.
This guide compares ten popular ADC boards built around the ADS1115, ADS1256, and AD7606. The comparison considers bit depth, single-ended and differential inputs, programmable gain, data rates, communication protocols, supply requirements, and compatibility with Arduino, Raspberry Pi, and other maker platforms. It also distinguishes general-purpose precision modules from higher-speed data-acquisition hardware.
The list shows how each board fits different projects, from simple sensor monitoring to multi-channel synchronized sampling. The ADS1115 selections are especially approachable for Arduino and Raspberry Pi users, while the ADS1256 and AD7606 serve more demanding acquisition tasks. Ratings and specifications reflect the supplied listings, while current pricing and availability can change over time.
Top 3 Picks for Best Arduino ADC Board
Teyleten Robot ADS1115 16-Bit 4-Channel ADC
4.7Editor score
16-bit conversion resolution
Four analog input channels
Programmable gain amplifier
8–860 SPS data rates
HiLetgo ADS1256 24-Bit ADC
4.6Editor score
24-bit conversion resolution
Eight single-ended inputs
Four differential input options
Up to 30 kSPS output
Top 10 Best Arduino ADC Board in 2026 Compared
This side-by-side comparison highlights the resolution, channel configurations, interfaces, and sampling capabilities of all ten boards, helping you select the right ADC for your Arduino project.
ProductsSpecificationsEditor scorePrice
Editor's Choice
Teyleten Robot ADS1115 3-Pack
16-bit resolution
Four input channels
Two differential inputs
8–860 SPS rates
4.7Editor score
Editor's Choice
HiLetgo ADS1256 24-Bit
24-bit resolution
Eight single-ended inputs
Four differential inputs
30 kSPS output rate
4.6Editor score
Best Budget
2Pcs ADS1115 16-Bit
16-bit resolution
Four input channels
Seven input ranges
0x48–0x4B addresses
5.0Editor score
HiLetgo ADS1115 3-Pack
16-bit resolution
Four input channels
Programmable gain amplifier
2.0–5.5V supply
4.3Editor score
4Pcs ADS1115 16-Bit
16-bit resolution
Four differential inputs
Single-ended input support
8–860 SPS rates
4.1Editor score
2PCS ADS1115 I2C ADC
16-bit resolution
Four input channels
Seven input ranges
2.0–5.5V supply
5.0Editor score
Lonely Binary ADS1115 3-Pack
16-bit resolution
Four single-ended inputs
Two differential inputs
Up to four modules
4.4Editor score
Teyleten Robot AD7606 8-Channel
16-bit resolution
Eight independent channels
200 kSPS sampling rate
SPI data communication
3.0Editor score
4PCS ADS1115 16-Bit
16-bit resolution
Four input channels
Programmable gain amplifier
I2C communication
4.6Editor score
HiLetgo ADS1115 Single Module
16-bit resolution
Four input channels
Programmable gain amplifier
8–860 SPS rates
4.3Editor score
1. Teyleten Robot ADS1115 3-Pack – Best Overall Arduino ADC Board
Teyleten Robot ADS1115 3-Pack
16-bit resolution
Four analog input channels
Two differential inputs
8–860 SPS sampling
The Teyleten Robot ADS1115 3-Pack earns the top position because it combines a well-balanced set of precision features with enough hardware to support several projects at once. Its 4.7 rating reflects a favorable buyer history, while the ADS1115 provides 16-bit conversion across four single-ended channels or two differential inputs. That combination makes it a practical starting point for sensor readings, voltage monitoring, and control experiments.
Pros
- Balanced accuracy and versatility
- Useful three-module bundle
- Wide input range selection
- Works with Arduino and Raspberry Pi
- Low-power single-shot operation
Cons
- I2C limits high-speed sampling
- Shared address requires configuration
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The onboard programmable gain amplifier is one of the module's most useful features. It lets the user select from several input ranges extending from small bipolar voltages to much wider ranges, which helps preserve useful detail when measuring low-level signals. Data rates can be programmed from 8 to 860 samples per second, and single-shot mode automatically shuts down after conversion to support efficient battery-powered operation.
Its limitations come from the design of the ADS1115 rather than obvious shortcomings in the module. I2C communication makes wiring straightforward, but the interface and converter architecture are not intended for high-rate waveform acquisition. If all three modules are connected, their addresses must be set differently for the bus to recognize each one. Those constraints are reasonable for precision measurement and modest sampling needs.
This is a strong recommendation for students, Arduino learners, Raspberry Pi builders, and engineers creating multi-sensor monitoring systems. The three-pack allows separate channels or boards for independent projects, spares, or a larger acquisition network. Choose it when 16-bit precision, flexible gain, and uncomplicated I2C integration matter more than very rapid sampling.
Precision With Flexible Signal Ranges
The 16-bit converter and programmable gain amplifier make this board useful for both relatively large sensor outputs and small voltage changes. Selecting the appropriate range helps place the signal within the converter's useful measurement span.
Three Modules Expand Project Capacity
The multi-pack is especially useful when monitoring several sensors or keeping dedicated boards for different prototypes. With suitable I2C address configuration, multiple converters can coexist on the same communication bus.
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2. HiLetgo ADS1256 24-Bit – Best Precision Arduino ADC Board
HiLetgo ADS1256 24-Bit
24-bit conversion resolution
Eight single-ended inputs
Four differential inputs
30 kSPS maximum output
The HiLetgo ADS1256 stands out for projects that need more converter resolution than a typical ADS1115 module can provide. Its 24-bit ADC and four-channel differential input arrangement make it suitable for precision instrumentation, where detecting very small changes in a voltage can be more important than maximizing sample rate.
Pros
- Exceptional nominal resolution
- Flexible channel configuration
- Integrated precision reference
- Fast output data rates
- Ideal for sensitive measurements
Cons
- More complex than ADS1115
- Three-volt measurement limit
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The board uses a high-precision TI ADS1256 chip and includes an ADR03 2.5-volt reference source. It can be configured as eight single-ended inputs or four differential inputs, giving users flexibility in how sensors are connected. Data output rates reach 30 kSPS, and the listed nonlinearity of ±0.0010% highlights its emphasis on accurate acquisition.
The trade-off is that this is not a drop-in simplicity solution like the simplest ADS1115 breakout. The board is specified for analog voltages within 3 volts, and its control, configuration, and data-handling requirements are more involved. Users should design the signal path, grounding, and software conversion process carefully rather than expecting every sensor output to connect directly.
Choose the ADS1256 for laboratory monitoring, precision sensor interfaces, or data collection where converter resolution is the leading requirement. It is a better fit for an engineer who understands ADC configuration than for a first-time maker seeking the simplest possible module. For ordinary Arduino sensor projects, the ADS1256 may be unnecessary, but for fine measurements it offers a clear technical advantage.
High Resolution Reveals Fine Changes
A 24-bit conversion scale is well suited to signals in which a small voltage change must remain distinguishable from noise and other variations. The on-board reference component helps support stable, repeatable acquisition.
Channel Flexibility Supports Specialized Wiring
Operating as eight single-ended or four differential inputs lets the board accommodate different sensor arrangements. Differential connections are particularly useful when a project benefits from measuring a signal relative to another reference.
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3. 2Pcs ADS1115 16-Bit – Best Value Arduino ADC Board
2Pcs ADS1115 16-Bit
16-bit conversion resolution
Four analog input channels
Seven programmable ranges
0x48–0x4B addresses
This two-pack ADS1115 module combines a perfect 5.0 listing rating with the features needed for everyday precision measurements. It delivers 16-bit conversion through four single-ended channels or two differential inputs, making it an approachable option for reading potentiometers, resistive sensors, and other analog outputs through an Arduino or Raspberry Pi.
Pros
- Perfect five-star listing rating
- Two modules included
- Broad programmable input selection
- Compact and easy to connect
- Useful with common maker platforms
Cons
- Modest maximum sampling rate
- Shared-bus addresses need adjustment
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Seven programmable input ranges give users meaningful control over how each signal is measured. The available ranges span from ±0.256 volts to ±6.144 volts, while the data rate can be adjusted from 8 to 860 samples per second. Selectable I2C addresses from 0x48 through 0x4B also make it possible to operate more than one converter on a shared bus.
Its main limitation is the relatively modest sampling rate of the ADS1115 design. It is best suited to slow-changing or periodically sampled signals rather than fast waveforms. The presence of two modules also means users will need to manage address selection if both are active simultaneously, although separate address pins make that task manageable.
This is a compelling pick for beginners, educators, and anyone building a two-channel or multi-module measurement system. It offers enough precision and gain flexibility for many practical sensor projects without moving to more complicated acquisition hardware. The pair is particularly attractive when you want one module for a prototype and another for a second experiment or expansion.
Two Modules for Expanding Systems
The two-board format supports parallel experiments, redundant measurements, or a larger sensor installation. Changing the I2C address on each board allows them to share the same SDA and SCL wiring.
Programmable Gain Improves Low-Level Reads
Seven input ranges let the user match the converter settings to the voltage presented by a sensor. This flexibility is valuable for low-amplitude signals that would otherwise occupy only a small portion of the available measurement range.
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4. HiLetgo ADS1115 3-Pack – Versatile Multi-Sensor ADC Choice
HiLetgo ADS1115 3-Pack
16-bit conversion resolution
Four analog input channels
Programmable gain amplifier
Comparator mode support
The HiLetgo ADS1115 3-Pack is a versatile option for projects that need several precision ADC modules. Its 4.3 rating indicates generally favorable buyer feedback, and the familiar ADS1115 architecture offers 16-bit resolution, four channels, and a programmable gain amplifier in a convenient development-board format.
Pros
- Three modules included
- Familiar I2C interface
- Useful Raspberry Pi compatibility
- Automatic single-shot shutdown
- Flexible programmable data rate
Cons
- Lower rating than leading picks
- Modest 860 SPS ceiling
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The module works particularly well with Raspberry Pi because many Raspberry Pi models do not provide analog GPIO inputs. Its I2C interface also integrates neatly with Arduino boards and other microcontrollers. Users can select data rates from 8 to 860 samples per second, use single-shot mode for automatic shutdown, and take advantage of comparator mode to support accurate threshold-related decisions.
The limitations are modest but worth noting. This converter is better suited to periodic readings than to high-frequency signal capture, and each board on a shared I2C bus needs a distinct address. The supplied rating is lower than that of the leading products in this list, although ratings alone cannot capture whether a module meets a particular project's needs.
Choose this pack for classroom environments, Raspberry Pi monitoring stations, and multi-board sensor networks. It gives makers a straightforward way to add precision analog inputs without implementing a more demanding ADC interface. It is especially attractive for users who value familiar documentation, common ADS1115 libraries, and the freedom to keep spare boards available.
A Natural Fit for Raspberry Pi
Because analog inputs are not directly available on many Raspberry Pi boards, an external I2C converter fills a common gap. The result is a simple bridge between analog sensors and a maker-friendly Linux or MicroPython environment.
Efficient Periodic Measurements
Single-shot mode automatically shuts the converter down after taking a reading. This behavior is useful for battery-conscious devices and for systems that sample a sensor intermittently rather than continuously.
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5. 4Pcs ADS1115 16-Bit – High Capacity Four-Module ADC Set
4Pcs ADS1115 16-Bit
16-bit conversion resolution
Four differential inputs
Single-ended input support
Automatic shutdown mode
This four-piece ADS1115 set is built for users who want to establish a multi-module analog measurement system. The modules use 16-bit conversion and support both single-ended and differential signals, while their broad supply range of 2.0 to 5.5 volts suits many common development environments.
Pros
- Four-board multi-pack
- Supports differential and single-ended inputs
- Wide operating supply range
- Programmable sampling rates
- Supports comparator operation
Cons
- Lowest ADS1115 listing rating
- Address management adds complexity
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Four differential input channels can be sampled simultaneously, and the modules also support single-ended operation. Programmable data rates from 8 to 860 samples per second allow the user to balance conversion speed against power consumption. A single-shot mode and comparator mode further support efficient monitoring and threshold-oriented applications.
The four-board format introduces more configuration work than a single-module purchase. Each converter must be assigned a usable I2C address if all four are active on one bus. The 4.1 listing rating is also lower than those of the other ADS1115 packs here, so buyers should focus on the required quantity and project architecture rather than treating the rating as the only decision factor.
This set is a sensible option for multi-sensor monitoring, classroom inventories, or projects that need numerous ADC boards. It can support larger data loggers when the address and wiring plan is handled carefully. For a single sensor or a small prototype, a two-pack would be more proportionate, but for planned expansion this four-pack provides useful capacity.
Expandable Architecture for Many Sensors
Four modules give a maker room to distribute analog channels across a larger system. Properly assigned I2C addresses allow the converters to operate from a common bus while retaining independent measurements.
Flexible Inputs for Mixed Signals
Supporting single-ended and differential operation means the same hardware can handle sensors referenced to ground as well as paired signal arrangements. This flexibility helps standardize a prototype around one ADC platform.
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6. 2PCS ADS1115 I2C ADC – Compact Two-Board Sensor Interface
2PCS ADS1115 I2C ADC
16-bit conversion resolution
Four analog input channels
Seven programmable ranges
2.0–5.5V supply
This two-module ADS1115 package is a strong compact choice for Arduino and Raspberry Pi sensor projects. It holds a perfect 5.0 listing rating and offers the same fundamental capabilities that make the ADS1115 popular: 16-bit conversion, four analog input channels, an I2C interface, and a programmable gain amplifier.
Pros
- Perfect five-star listing rating
- Two ready-to-use modules
- Broad programmable gain ranges
- Simple I2C connection
- Wide supply-voltage compatibility
Cons
- I2C architecture limits speed
- Requires unique bus addresses
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Users can configure seven input ranges, from narrow bipolar ranges of ±0.256 and ±0.512 volts to wider ranges reaching ±6.144 volts. The data rate can be adjusted between 8 and 860 samples per second, while the operating supply spans 2.0 to 5.5 volts. Four selectable I2C addresses allow the two boards to coexist when their address settings are changed.
The usual I2C trade-offs remain. The converter is optimized for sensor values and periodic measurements rather than fast waveform analysis, and multiple boards add address-planning work. Neither issue is unusual for this class of module and can be managed in software during setup.
Choose this package for a first ADC project, a compact two-channel monitor, or a spare board for troubleshooting. Its perfect rating, simple interface, and flexible gain make it a confident recommendation for makers who prioritize ease of use and broad compatibility.
Simple Wiring Across Maker Platforms
The I2C interface needs only the communication and power connections, making it approachable on Arduino and Raspberry Pi. Existing ADS1115 library support further reduces the amount of custom low-level code required.
Gain Settings Fit Many Sensors
Seven selectable ranges accommodate sensors with different output levels. Choosing the narrowest suitable range improves the use of the converter's available resolution and is a sound calibration practice.
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7. Lonely Binary ADS1115 3-Pack – Polished Multi-Board ADC Option
Lonely Binary ADS1115 3-Pack
16-bit conversion resolution
Four single-ended inputs
Two differential inputs
ENIG gold plating
The Lonely Binary ADS1115 3-Pack focuses on construction quality and broad platform support. Its 4.4 rating reflects positive buyer feedback, while the ENIG gold finish, lead-free construction, and pre-soldered headers distinguish it from basic breakout boards that may require additional assembly.
Pros
- Pre-soldered headers included
- ENIG lead-free finish
- 3.3V and 5V logic compatible
- Supports up to four modules
- Broad microcontroller compatibility
Cons
- Higher cost per module
- Advertising-heavy product details
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The converter provides 16-bit resolution across four single-ended or two differential channels. Six software-selectable gain ranges extend from ±0.256 to ±6.144 volts, with a stated resolution of 7.8 microvolts per least significant bit at the narrowest range. The modules operate from 2.0 to 5.5 volts and tolerate 3.3-volt and 5-volt logic signals without requiring a separate level shifter.
Its I2C addresses can be selected from 0x48 through 0x4B, allowing up to four modules and 16 analog channels to share one bus. Compatibility is broad, covering Arduino UNO, Mega, and Nano, ESP32, ESP8266, Raspberry Pi, Pico, STM32, and BBC micro:bit, with library support for C++, MicroPython, and CircuitPython.
Choose this pack for polished prototypes, classroom kits, or professional-looking multi-channel installations. The included headers and finish reduce preparation work, while the cross-platform documentation makes it useful for teams working with more than one microcontroller family.
Ready-Made Construction Saves Setup Time
Pre-soldered headers allow immediate breadboard or jumper-wire use, while the ENIG finish improves solderability and resists oxidation. These construction details are useful for prototypes that will be handled or revised repeatedly.
Mixed Voltage Logic Without Complication
Compatibility with both 3.3-volt and 5-volt signals simplifies connections to modern and classic development boards. Avoiding a separate level shifter reduces component count and makes the wiring plan easier to understand.
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8. Teyleten Robot AD7606 8-Channel – Best High-Speed Arduino ADC Board
Teyleten Robot AD7606 8-Channel
16-bit conversion resolution
Eight independent channels
200 kSPS sampling rate
SPI serial communication
The Teyleten Robot AD7606 is the clear high-speed option in this roundup. Unlike the I2C-focused ADS1115 modules, it uses SPI communication and supports synchronized sampling across eight independent channels. Its 200 kSPS rate and 16-bit resolution make it relevant for projects involving faster or more closely timed analog signals.
Pros
- Very high sampling rate
- Eight independent input channels
- Synchronized multi-channel sampling
- Selectable bipolar voltage ranges
- Parallel and serial output modes
Cons
- Lowest listing rating
- More complex hardware integration
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The board accepts input ranges of ±5 or ±10 volts, provides a 1-megohm input impedance, and uses an internal 2.5-volt reference. Six oversampling modes offer options for improving effective signal quality. Data can be returned serially or in parallel, while a 3.81-millimeter connector simplifies connection to multi-channel input hardware.
This greater capability comes with a more demanding integration process. The module requires a 5-volt supply, draws up to 20 milliamperes, and uses a 3.3-volt control signal level. SPI software and the choice between parallel and serial output add complexity compared with a straightforward I2C ADS1115 setup. Its 3.0 rating is also the lowest listed here.
Choose the AD7606 when synchronized, higher-speed acquisition is central to the project and the builder can manage a more involved interface. It is well suited to multi-channel monitoring and data-acquisition experiments. For ordinary temperature, pressure, or potentiometer readings, a simpler ADS1115 remains the more sensible starting point.
Synchronized Acquisition Across Eight Channels
Eight independent channels and synchronized sampling allow multiple signals to be captured within the same acquisition sequence. This is valuable when comparing phase, timing, or changing values across several inputs.
Flexible Output Paths for System Design
The option to use serial or parallel data output allows the module to fit different microcontroller architectures. Serial output can simplify wiring, while parallel output can suit designs prepared for faster word transfers.
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9. 4PCS ADS1115 16-Bit – Practical Four-Module Sensor Set
4PCS ADS1115 16-Bit
16-bit conversion resolution
Four analog input channels
Programmable gain amplifier
Standard I2C communication
The four-piece ADS1115 set provides a practical balance of capacity, features, and buyer reception. Its 4.6 rating is among the stronger results in the comparison, and every module offers 16-bit conversion, four input channels, a programmable gain amplifier, and a standard I2C interface.
Pros
- Four complete ADC modules
- Strong 4.6 listing rating
- Simple two-wire communication
- Works with major microcontroller families
- Suitable for varied sensor projects
Cons
- Address planning required for four boards
- Not designed for high-speed waveforms
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The simple two-wire communication scheme keeps integration straightforward on Arduino, Raspberry Pi, ESP32, and STM32 platforms. A programmable gain amplifier improves sensitivity when working with low-voltage sensor outputs. The modules are also suitable for robotics, monitoring systems, temperature and pressure sensors, light sensors, and general engineering experiments.
Users should not mistake the four-board bundle for a four-channel board: each module independently provides four analog inputs, and the modules must be configured appropriately if placed on the same I2C bus. As with other ADS1115 products, the maximum data rate of 860 samples per second is modest and inappropriate for capturing fast-changing waveforms.
This package is a good choice for multi-sensor prototypes, classroom stock, and expandable monitoring installations. It is less necessary for a one-channel demonstration, but for a project expected to use several converters, the bundle provides useful flexibility and spare capacity without requiring a more complex ADC architecture.
Consistent Interface Across Platforms
A standard I2C connection means the same modules can move between several popular microcontroller ecosystems. That consistency is valuable for learners who want to reuse hardware as their programming skills and project goals evolve.
Useful Quantity for Classroom Inventories
Four modules are easier to distribute among several experiments than a large single-board system. They can also serve as spares, reducing the chance that one damaged connection interrupts a lesson or demonstration.
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10. HiLetgo ADS1115 Single Module – Simple Starter Arduino ADC Board
HiLetgo ADS1115 Single Module
16-bit conversion resolution
Four analog input channels
Programmable gain amplifier
Automatic single-shot shutdown
The single HiLetgo ADS1115 board is a straightforward entry point for anyone adding analog inputs to an Arduino or Raspberry Pi. It provides 16-bit resolution, four analog channels, a programmable gain amplifier, and a familiar I2C interface, with a 4.3 listing rating indicating generally positive buyer feedback.
Pros
- Simple single-module design
- Straightforward I2C integration
- Useful Raspberry Pi compatibility
- Automatic power-saving shutdown
- Adjustable sampling data rate
Cons
- Only one board included
- Modest maximum sampling rate
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Its supply range of 2.0 to 5.5 volts supports many common development boards. Programmable data rates from 8 to 860 samples per second give users control over measurement speed, and single-shot mode shuts the device down automatically after conversion. Comparator mode is also available for threshold-related operation.
The primary limitation is scalability: only one module is included, so expanding to multiple converters requires additional boards and address configuration. The ADC architecture also remains unsuitable for high-speed waveform capture. These constraints do not affect its usefulness for common temperature, light, potentiometer, and general sensor measurements.
Choose this option for a first prototype, one sensor node, or a compact project requiring only a small number of analog readings. It delivers the essential ADS1115 functions without a multi-pack structure, making it a simple and understandable way to begin using an external precision ADC.
A Simple Path Into Analog Sensing
The board removes the need to design a custom analog front end while preserving adjustable gain and reasonable conversion resolution. It is a practical way for a beginner to learn ADC configuration with a widely supported converter.
Power Savings for Intermittent Use
Automatic shutdown after a single-shot conversion is useful in portable installations that do not need to sample continuously. It can reduce energy use when the main controller controls when readings are requested.
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Buying Guide – How to Choose the Best Arduino ADC Board
The right Arduino ADC board depends on the signal, the number of measurements, required speed, and your preferred communication interface. Review resolution, input topology, gain, and platform compatibility before purchasing.
Conversion Resolution
Resolution determines how finely the ADC divides its input range into discrete values. The ADS1115 products in this guide provide 16-bit conversion, which is well suited to many sensor readings and control applications. The ADS1256 raises the nominal resolution to 24 bits, making it attractive when detecting very small voltage changes is essential. The AD7606 combines 16-bit resolution with a much faster sampling rate, illustrating that resolution alone does not determine performance.
Input Channel Configuration
A four-channel board can reduce the need for multiple converters, especially when several sensors must be read. Single-ended inputs are convenient for sensors referenced to ground, while differential inputs can reject common-mode noise and measure one voltage relative to another. The ADS1256 can operate as eight single-ended or four differential inputs, while the AD7606 provides eight independent channels. Plan the wiring before choosing a board, because the advertised channel count and connection method do not always mean the same thing.
Programmable Gain Range
A programmable gain amplifier lets you scale small signals to use more of the converter's available range. Most ADS1115 choices offer selectable ranges that can accommodate low-level sensor outputs and larger voltages. The AD7606 provides fixed bipolar choices of ±5 or ±10 volts rather than the same software-selected range structure. Correct gain selection can improve meaningful resolution, but exceeding the selected range can lead to saturation or inaccurate readings.
Sampling Speed
Sampling speed matters most when a signal changes quickly or when measurements must occur at precise intervals. The ADS1115 supports programmable rates from 8 to 860 samples per second, making it appropriate for environmental readings, slow analog signals, and periodic monitoring. The ADS1256 reaches 30 kSPS, and the AD7606 supports 200 kSPS with synchronized eight-channel acquisition. Faster sampling also demands more careful signal conditioning and software handling, so the highest rate is not automatically the most useful.
Communication Interface
I2C uses two communication lines and is ideal when wiring simplicity matters. Most Arduino and Raspberry Pi projects can use existing ADS1115 libraries, and selectable addresses allow multiple modules to share a bus. SPI uses more connections but supports faster data movement and suits higher-performance acquisition hardware. The AD7606 also offers a parallel output option. Select an interface that matches your controller, available pins, library support, and desired sampling performance.
Supply and Logic Voltage
The ADS1115 boards in the comparison accept a 2.0-to-5.5-volt supply, allowing use with both 3.3-volt and 5-volt systems when the logic levels are appropriate. The Lonely Binary modules explicitly state 3.3- and 5-volt logic compatibility. By contrast, the AD7606 requires a 5-volt module supply and uses 3.3-volt control signals. Verify every power requirement and make sure the Arduino, sensor, and ADC share a safe grounding arrangement.
Module Quantity and Addressability
Multi-packs are valuable when a project needs several independent converters, multiple test stations, classroom inventory, or spare boards. Most ADS1115 modules expose four I2C addresses from 0x48 to 0x4B, allowing up to four boards to share a bus. A larger pack does not automatically make wiring simpler; each board still needs an address plan and correct connections. For one or two channels, a single board or two-pack is generally easier to manage.
Construction and Platform Support
Board finish, soldering, and included headers can influence how quickly a prototype is ready to use. The Lonely Binary modules feature ENIG plating and pre-soldered headers, while other boards may require assembly depending on what is included. Confirm compatibility with your exact Arduino model, Raspberry Pi model, ESP32, or other controller. For Raspberry Pi, verify that suitable libraries and I2C configuration are available before starting.
How to Use and Care for Your Arduino ADC Board
Begin by identifying the voltage range, grounding requirements, and output type of every sensor. Connect the module's power and ground to the controller, then wire SDA and SCL to the corresponding I2C pins for an ADS1115. For the AD7606, follow the pinout for its SPI or parallel connection. Check voltage levels carefully and avoid connecting an analog signal until the range and gain settings are known.
Use a suitable ADS1115 library and configure the I2C address, gain, conversion rate, and single-ended or differential mode. Read the raw conversion value and apply the correct conversion factor for the selected input range. Calibrate with a known reference voltage, filter noisy readings in software, and avoid assuming that the nominal bit depth automatically guarantees perfect accuracy. For differential measurements, verify polarity and the selected channel pair.
Protect the module from moisture, conductive dust, accidental shorts, and voltages outside the stated range. Keep sensor wiring away from noisy motors and switching supplies where possible, and use adequate common grounding. For multi-module systems, document each I2C address and keep connections manageable with labeled wires. Periodically compare readings with a trusted meter or reference source to identify drift, loose connections, and sensor faults.
Frequently Asked Questions
Does an Arduino already include an ADC?
Most Arduino boards include a small number of analog inputs, commonly labeled A0 through A5 on Uno-style models. The exact number and resolution vary by board, and some modern boards expose fewer analog pins. An external ADC board is useful when more channels, higher resolution, adjustable gain, faster acquisition, or differential inputs are required.
What resolution do I need for an Arduino ADC board?
A 16-bit ADC is appropriate for many temperature, pressure, potentiometer, and low-voltage sensor projects. A 24-bit converter can be preferable when the measured signal is small or when subtle changes need to be distinguished. Resolution should be considered alongside noise, reference stability, signal conditioning, and the rate of data capture rather than treated as the only measure of quality.
Can one ADS1115 module read multiple sensors?
Yes. Each ADS1115 module provides four single-ended channels or two differential inputs. You can connect several sensors and select their channels in software, although readings are obtained according to the converter's programmed data rate. If the system needs more simultaneous channels, multiple modules can share I2C wiring when each is assigned a different address.
When is a faster ADC module preferable?
A faster module is preferable when monitoring rapidly changing signals, capturing events with accurate timing, or synchronizing multiple inputs. The ADS1256 supports output rates up to 30 kSPS, while the AD7606 reaches 200 kSPS with eight independent channels. These faster designs also require more involved wiring, control, and signal handling than a typical ADS1115 board.
Is the ADS1115 suitable for Raspberry Pi?
The ADS1115 is well suited to Raspberry Pi because many Raspberry Pi models do not expose analog GPIO inputs. It communicates through I2C and can use established Python, MicroPython, or CircuitPython libraries, depending on the development environment. I2C must be enabled in the operating system, and the correct I2C bus should be selected in the software.
What is the benefit of the programmable gain amplifier?
A programmable gain amplifier adjusts the converter's measurement range to match the incoming signal. Selecting a narrow range for a small signal allows more of the available conversion scale to represent that signal, which can make changes easier to resolve. The selected range must still cover the expected voltage without clipping it.
Can I connect several ADS1115 modules on one I2C bus?
Yes, as long as each module uses a different I2C address. The supported address range is normally 0x48 through 0x4B, allowing up to four modules and therefore up to 16 single-ended channels on one bus. The power rails and grounds must be shared correctly, and the software must read from the correct address for every module.
Why do ADC readings differ from a handheld multimeter?
Differences can come from probe location, grounding, reference-voltage variation, sensor resistance, electromagnetic interference, or an unsuitable gain range. The Arduino may also be applying filtering or averaging that the meter does not. Compare the raw ADC value with a known reference, verify the wiring, and check the signal and power rails before assuming the converter is defective.
Final Thoughts on Choosing the Best Arduino ADC Board
The Teyleten Robot ADS1115 3-Pack is the strongest all-around choice because it combines 16-bit precision, four channels, adjustable gain, and multiple boards in a familiar I2C format. The two-pack ADS1115 option is a compelling value pick, while the HiLetgo ADS1256 stands out for projects that benefit from 24-bit resolution and more specialized channel configuration.
Prioritize the requirements that directly affect your measurements: resolution for fine signal detection, channel topology for sensor wiring, gain range for voltage levels, and sampling speed for changing signals. Simple projects rarely need a 200 kSPS converter, while a high-speed data logger may find an ADS1115 too slow. Match the interface and electrical requirements to the controller before considering quantity or extras.
Finally, check current pricing, availability, package contents, and seller details before buying. Boards and component packages can change over time, and a particular listing may not include every accessory implied by the product title. The guide's specifications and ratings provide a practical starting point for comparing the ten options, while current product pages should supply the final purchasing details.