NAU7802 - SparkFun Qwiic Scale [SEN-15242] - (AD47576)

Description:

The SparkFun Qwiic Scale is a small breakout board for the NAU7802 that allows you to easily read load cells to accurately measure the weight of an object. By connecting the board to your microcontroller, you'll be able to read changes in a load cell's resistance and, with some calibration, you can get very accurate weight measurements. This can be useful for creating your own industrial scale, process control, or simple presence sensing. Using our handy Qwiic system, no soldering is required to connect it to the rest of your system. However, we've still broken out the 0.1" pins in case you prefer to use a breadboard.

By connecting a load cell to the SparkFun Qwiic Scale, you'll be able to translate the sensor data into something your microcontroller can read. The NAU7802 is an ADC with built-in gain and I2C output to amplify and convert the readings from a standard load cell. A load cell is basically a device that translates pressure or force into electrical signals. In most cases, this signal is very small and needs to be amplified. There are many popular chips that read the change and amplify it, but the NAU7802 goes a step further and converts everything into a true I2C output (connected to a Qwiic connector).

The board provides a four-pin terminal block for connecting your load cell without soldering. In addition to the I2C pins, the board also breaks out an interrupt and AVDD pin on the edge of the board. Differential input signals (plus a second set of input signals) are also split out in the center of the board.

Characteristics:

• Working voltage: 3.3V (NAU7802: 2.7V-5.5V)
• 24-bit dual-channel analog-to-digital converter
• Programmable gain amplifier
• Integrated temperature sensor
• Simultaneous rejection of 50 Hz and 60 Hz
• Programmable PGA gains from 1 to 128
• Programmable aDC data output rates
• External differential reference voltage range from 0.1 V to 5 V
• Low power consumption and programmable power management options
• Standby current <1 µA
• 2 Qwiic connectors

Documents:

• Schematic
• EagleFiles
• Hookup Guide
• Datasheet (NAU7802)
• Getting Started with Load Cells
• SparkFun Qwiic Scale NAU7802 Arduino Library
• Hardware Repo

Reference link