Translating physical forces into digital data usually requires managing multiple components, but the SparkFun Qwiic Scale simplifies the entire process. With the on-board NAU7802, this Qwiic breakout board acts as an all-in-one amplifier and Analog-to-Digital Converter (ADC). It effortlessly translates the minuscule resistance changes from a standard load cell into an easily readable digital signal, allowing you to accurately measure the weight of an object directly from your microcontroller.

Versatile Application

By converting analog pressure into a true I2C output, this board serves as a versatile function for a wide variety of custom projects:

• Process Control: Automate precise ingredient measurements for manufacturing or complex DIY setups.
• Smart Inventory: Create a pressure-sensitive shelf that tracks bin weight to know exactly when supplies are running low.
• Presence Detection: Build hidden, weight-based triggers for interactive installations or smart-home automation.

Completely Solderless Setup

To make building your custom scale as fast as possible, the board features an incredibly useful four-pin spring terminal. Simply press down and insert your load cell wires with absolutely no soldering required. Additionally, communication to your microcontroller is handled entirely through our plug-and-play Qwiic Connect System, though standard 0.1-inch spaced pins (including an interrupt pin and AVDD) are fully broken out to the edge for breadboard users.

Using Multiple Scales

Please be aware that the NAU7802 has a fixed, hardware-defined I2C address of 0x2A. If your project requires multiple scales on the same bus, you will need to use a multiplexer (like the Qwiic Mux Breakout) to communicate with each without conflicts.

Specifications:

• Operating Voltage: 3.3V (NAU7802: 2.7V-5.5V)
• I2C Address: 0x2A (Hardware Defined)
• 24-bit Dual-Channel Analog to Digital Converter
• Programmable Gain Amplifier
• On-chip temperature sensor
• Simultaneous 50Hz and 60Hz rejection
• Programmable PGA gains from 1 to 128
• Programmable ADC data output rates
• External differential reference voltage range from 0.1V to 5V
• Low Power Consumption and Programmable Power Management Options
• <1uA standby current
• 2x Qwiic Connectors

Documentations :

• Schematic
• Hookup Guide
• Datasheet (NAU7802)
• Getting Started with Load Cells
• Libraries:
• Arduino
• Python / MicroPython / CircuitPython

• Hardware Repo

Package Includes :

• 1 x SparkFun Qwiic Scale - NAU7802