NAU7802 24-Bit ADC Load Cell Amplifier Board – STEMMA QT / Qwiic
NAU7802 24-Bit ADC Load Cell Amplifier Board – STEMMA QT / Qwiic
NAU7802 24-Bit ADC Precision Load Cell Amplifier Board – STEMMA QT / Qwiic Interface
Take your weighing and sensing projects to the next level with this high-resolution NAU7802 24-Bit Differential ADC Breakout Board. Designed to work seamlessly with the Adafruit NAU7802 ecosystem, this compact module integrates a super-high-resolution 24-bit analog-to-digital converter with programmable gain and calibration circuitry — making it an ideal solution for connecting strain gauges, load cells, and any four-wire Wheatstone bridge sensor.
Whether you're building a precision scale, a force measurement system, or a custom data-acquisition device, this board gives you the accuracy and flexibility you need. Made in Mainland China.
Key Features
- 24-Bit Differential ADC – Ultra-high resolution for precise analog signal conversion
- Onboard Gain & Calibration Circuitry – Optimized for strain gauges and load cells in Wheatstone bridge configurations
- 4 Terminal Blocks – Easily connect any standard 4-wire sensor (E-, E+, A-, A+)
- Configurable Excitation Voltage – E+ pad delivers 2.4V–4.0V, providing a solid, stable positive reference
- STEMMA QT / Qwiic Compatible – Plug-and-play I²C connectivity; no soldering required for the I²C interface
- Fixed I²C Address – Use a multiplexer when connecting multiple sensors to one I²C bus
- CircuitPython / Python Library Support – Compatible with CedarGrove's CircuitPython/Python library for fast, easy configuration and reading
- Compact & Durable – Black plastic housing; lightweight and easy to integrate into enclosures or project builds
How It Works
The NAU7802 chip reads the tiny voltage differences produced by a Wheatstone bridge sensor. As your load cell or strain gauge flexes under a force, minuscule resistance changes translate into equally small voltage shifts — and the NAU7802's 24-bit ADC captures those shifts with exceptional fidelity, converting them into accurate force or mass measurements your microcontroller can use.
Wiring Guide
- E–: Connect to ground (typically the black wire)
- E+: Configurable excitation voltage output (typically the red wire)
- A–: Differential signal input (typically the white wire)
- A+: Differential signal input (typically the green wire)
Package Contents
- 1 × NAU7802 24-Bit ADC Module (4538)
Specifications
- Module: 4538 NAU7802
- ADC Resolution: 24-Bit Differential
- Interface: I²C (STEMMA QT / Qwiic)
- Excitation Voltage Range: 2.4V – 4.0V
- Color: Black
- Material: Plastic
- Country of Origin: Made in Mainland China
Note: Due to lighting and display differences, the item color in images may vary slightly from the actual product. Dimensional tolerances of ±1–3 cm may apply.
For more information on ADC standards and electronic measurement, visit the National Institute of Standards and Technology (NIST) – Measurement Standards.
Frequently Asked Questions
Q: What type of sensors is the NAU7802 24-Bit ADC module compatible with?
A: This NAU7802 ADC module is designed specifically for 4-wire Wheatstone bridge sensors, including most standard strain gauges and load cells. Any sensor with E–, E+, A–, and A+ connections can be wired directly into the onboard terminal blocks for immediate use.
Q: Does the NAU7802 module support I²C and Qwiic / STEMMA QT connections?
A: Yes. The board features a fixed I²C address and is fully compatible with the STEMMA QT and Qwiic connector ecosystems, enabling tool-free, plug-and-play integration with supported microcontroller boards. If you need multiple NAU7802 sensors on a single I²C bus, simply add an I²C multiplexer.
Q: What software libraries work with the NAU7802 ADC breakout board?
A: The module is compatible with CedarGrove's CircuitPython/Python library, which allows you to configure gain, calibration, and sampling rate, and to read conversion results quickly and efficiently. It also works within the broader Adafruit NAU7802 software ecosystem.
Q: Can this board be used for precision weighing scale projects?
A: Absolutely. With its 24-bit resolution and onboard calibration circuitry, the NAU7802 module is well-suited for precision digital weighing scales, force gauges, and any application requiring accurate mass or force measurements from a load cell.