# Adafruit NAU7802 24-Bit ADC - STEMMA QT / Qwiic
## Overview
Info: As of June 23rd, 2025 – By popular demand! We've updated this design to expose the 'second' ADC input (B+ and B-). We've updated this PCB to now come with a 6-pin terminal block port, instead of a 4-pin.
If you are feeling the stress and strain of modern life a Wheatstone bridge and you want to quantify it, this handy breakout will do the job, no sweat! The ** Adafruit NAU7802** contains a super-high-resolution 24-Bit differential ADC with extra gain and calibration circuitry that makes it perfect for measuring strain gauges / load cells or other sensors that have four wires that are connected in a [Wheatstone bridge arrangement](https://en.wikipedia.org/wiki/Wheatstone_bridge).
Each breakout comes with a NAU7802 ADC chip, plus some support circuitry and a terminal block that can be used to connect a 4-wire sensor.
The **E-** pad connects to ground (often a black wire), the **E+** pad connects to a generated voltage from the NAU7802 that can be configured from 2.4V to 4.0V for a solid positive reference (often a red wire).
Then **A- ** and **A+** pads connect to the differential outputs from the bridge. For example, connecting to a strain gauge these tend to be the white and green wires.
As the sensor is twisted and bent, the slight changes in resistance are converted to minuscule voltage changes that can be read by the NAU ADC for converting into force or mass measurements. You can use our [Arduino library](https://github.com/adafruit/Adafruit_NAU7802) or [CedarGrove's CircuitPython/Python library](https://github.com/CedarGroveStudios/CircuitPython_NAU7802) to configure and read the ADC for fast interfacing. Note that this sensor has a fixed I2C address of 0x2A. [If multiple sensors are desired on one I2C bus, a multiplexer can be used](https://learn.adafruit.com/working-with-multiple-i2c-devices).
- [Next Page](https://learn.adafruit.com/adafruit-nau7802-24-bit-adc-stemma-qt-qwiic/pinouts.md)
## Primary Products
### Adafruit NAU7802 24-Bit ADC - STEMMA QT / Qwiic
[Adafruit NAU7802 24-Bit ADC - STEMMA QT / Qwiic](https://www.adafruit.com/product/4538)
If you are feeling the stress and strain of ~~modern life~~ a Wheatstone bridge and you want to quantify it, this handy breakout will do the job, no sweat! The **Adafruit NAU7802** contains a super-high-resolution 24-Bit differential ADC with extra gain and calibration...
In Stock
[Buy Now](https://www.adafruit.com/product/4538)
[Related Guides to the Product](https://learn.adafruit.com/products/4538/guides)
## Featured Products
### Strain Gauge Load Cell - 4 Wires - 1Kg
[Strain Gauge Load Cell - 4 Wires - 1Kg](https://www.adafruit.com/product/4540)
A strain gauge is a type of electronic sensor used to measure force or strain (big surprise there). They are made of an insulating flexible backing with a metallic foil pattern. The resistance of a strain gauge changes when force is applied and the...
In Stock
[Buy Now](https://www.adafruit.com/product/4540)
[Related Guides to the Product](https://learn.adafruit.com/products/4540/guides)
### Strain Gauge Load Cell - 4 Wires - 5Kg
[Strain Gauge Load Cell - 4 Wires - 5Kg](https://www.adafruit.com/product/4541)
A strain gauge is a type of electronic sensor used to measure force or strain (big surprise there). They are made of an insulating flexible backing with a metallic foil pattern. The resistance of a strain gauge changes when force is applied and the...
In Stock
[Buy Now](https://www.adafruit.com/product/4541)
[Related Guides to the Product](https://learn.adafruit.com/products/4541/guides)
### Strain Gauge Load Cell - 4 Wires - 10Kg
[Strain Gauge Load Cell - 4 Wires - 10Kg](https://www.adafruit.com/product/4542)
A strain gauge is a type of electronic sensor used to measure force or strain (big surprise there). They are made of an insulating flexible backing with a metallic foil pattern. The resistance of a strain gauge changes when force is applied and the...
Out of Stock
[Buy Now](https://www.adafruit.com/product/4542)
[Related Guides to the Product](https://learn.adafruit.com/products/4542/guides)
### Strain Gauge Load Cell - 4 Wires - 20Kg
[Strain Gauge Load Cell - 4 Wires - 20Kg](https://www.adafruit.com/product/4543)
A strain gauge is a type of electronic sensor used to measure force or strain (big surprise there). They are made of an insulating flexible backing with a metallic foil pattern. The resistance of a strain gauge changes when force is applied and the...
In Stock
[Buy Now](https://www.adafruit.com/product/4543)
[Related Guides to the Product](https://learn.adafruit.com/products/4543/guides)
### STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long
[STEMMA QT / Qwiic JST SH 4-Pin Cable - 50mm Long](https://www.adafruit.com/product/4399)
This 4-wire cable is 50mm / 1.9" long and fitted with JST SH female 4-pin connectors on both ends. Compared with the chunkier JST PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
In Stock
[Buy Now](https://www.adafruit.com/product/4399)
[Related Guides to the Product](https://learn.adafruit.com/products/4399/guides)
### JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic
[JST SH 4-pin Cable with Alligator Clips - STEMMA QT / Qwiic](https://www.adafruit.com/product/4398)
This cable will make it super easy to use our plug-and-play STEMMA QT boards with boards like Circuit Playground. On one end you get a Qwiic / STEMMA QT connector (technically known as a JST SH 4-pin plug) into 4 individual wires with grippy alligator clips. We're carrying these to...
Out of Stock
[Buy Now](https://www.adafruit.com/product/4398)
[Related Guides to the Product](https://learn.adafruit.com/products/4398/guides)
### STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable
[STEMMA QT / Qwiic JST SH 4-pin to Premium Male Headers Cable](https://www.adafruit.com/product/4209)
This 4-wire cable is a little over 150mm / 6" long and fitted with JST-SH female 4-pin connectors on one end and premium Dupont male headers on the other. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert...
In Stock
[Buy Now](https://www.adafruit.com/product/4209)
[Related Guides to the Product](https://learn.adafruit.com/products/4209/guides)
### STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long
[STEMMA QT / Qwiic JST SH 4-pin Cable - 100mm Long](https://www.adafruit.com/product/4210)
This 4-wire cable is a little over 100mm / 4" long and fitted with JST-SH female 4-pin connectors on both ends. Compared with the chunkier JST-PH these are 1mm pitch instead of 2mm, but still have a nice latching feel, while being easy to insert and remove.
Out of Stock
[Buy Now](https://www.adafruit.com/product/4210)
[Related Guides to the Product](https://learn.adafruit.com/products/4210/guides)
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