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 ...
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 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.
- 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 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.
- multiplexer
- A multiplexer is a chip or board that lets one controller switch between several devices that would otherwise conflict on the same bus. It matters here because multiple modules with the same I2C address cannot normally share one I2C bus without extra hardware.
- 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 sensor element that changes resistance when it is stretched or compressed. It is commonly used for measuring force, weight, or bending, and often needs precise differential measurement electronics like this ADC.
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