Adafruit
Adafruit NAU7802 24-Bit ADC - STEMMA QT / Qwiic
The Adafruit NAU7802 is a high-resolution 24-bit differential ADC breakout designed specifically for reading strain gauges, load cells, and other Wheatstone ...
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The Adafruit NAU7802 is a high-resolution 24-bit differential ADC breakout designed specifically for reading strain gauges, load cells, and other Wheatstone bridge sensors. With built-in gain amplification and calibration circuitry, it converts the tiny voltage changes from bridge sensors into precise digital readings over I2C.
The breakout includes screw terminal blocks for connecting 4-wire sensors: E− (ground), E+ (configurable reference voltage from 2.4–4.0 V), and A−/A+ differential inputs. STEMMA QT / Qwiic connectors provide solderless I2C wiring to your microcontroller.
Key Features
- 24-Bit Differential ADC – Ultra-high resolution for precise strain and force measurements
- Built-In Gain & Calibration – Configurable gain and on-chip calibration for Wheatstone bridge sensors
- Configurable Reference Voltage – E+ output adjustable from 2.4 V to 4.0 V
- Screw Terminal Blocks – Four terminals (E−, E+, A−, A+) for easy sensor wiring
- I2C Interface – Fixed address; use a multiplexer for multiple sensors on one bus
- STEMMA QT / Qwiic Connectors – Solderless I2C connection (cable not included)
Typical Wiring
- E− → Ground (often black wire)
- E+ → Excitation voltage (often red wire)
- A− → Differential output − (often white wire)
- A+ → Differential output + (often green wire)
Ideal For
- Digital scales and weight measurement
- Strain gauge and load cell applications
- Force and pressure sensing
- Industrial and scientific measurement projects
Package Contents
- 1× Adafruit NAU7802 24-Bit ADC Breakout
- 4× Screw terminal blocks
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 board carries a small or fine-pitched component and brings its connections out to standard, breadboard- and header-friendly pins. Describing a part as a breakout means it can be wired into a project without soldering directly to the component's tiny contacts.
- 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.
- microcontroller
- A microcontroller is a small computer on a single chip that runs a stored program and controls connected inputs and outputs such as buttons, sensors, displays and communication interfaces. In a device built around one, it is the part that executes the code and coordinates the device's behaviour.
- multiplexer
- A multiplexer (mux) is a chip or circuit that selects one of several input signals and routes it to a single shared output, with select lines choosing which input is connected; running the same idea in reverse, to send one input to a chosen output, gives a demultiplexer. Multiplexers let a single controller or line work with several signals or devices that would otherwise clash on a shared connection.
- Qwiic
- Qwiic is a plug-in connector system for I2C devices that uses small 4-pin cables, so you can connect compatible sensors without soldering. It matters because your controller or adapter also needs Qwiic, or you will need a cable or breakout to wire it up.
- STEMMA
- A plug-and-cable connection system used on some maker electronics boards to make wiring simpler. If a product uses STEMMA, you need the matching cable or connector type to plug it in without soldering.
- STEMMA QT
- A small plug-in connector system for I2C boards that lets you connect compatible sensors and controllers without soldering. It matters because it can make wiring faster and less error-prone, especially when adding several small modules to a project.
- Strain gauge
- A strain gauge is a sensor element whose electrical resistance changes when it is stretched or compressed. It is commonly used to measure force, weight, pressure or bending, and because its resistance change is small it usually needs precise differential measurement electronics such as a high-resolution ADC.
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working with multiple i2c devices
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Resources & Downloads
Guides, code examples, and more
Related Tutorials
Free guides on learn.littlebird.com.au
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