By connecting a load cell to the Qwiic Scale you will be able to translate 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 one step further and converts everything to a true I2C output (attached to a Qwiic connector).
The board provides a four spring terminal to connect your load cell with no soldering required. In addition to the I2C pins, the board also breaks out an interrupt pin and AVDD to the edge of the board. The differential input signals (plus a second set of input signals) are broken out to the middle of the board, as well.
NOTE: The I2C address of the NAU7802 is 0x2A and is hardware defined. A multiplexer/Mux is required to communicate to multiple NAU7802 sensors on a single bus. If you need to use more than one NAU7802 sensor consider using the Qwiic Mux Breakout.
- Operating Voltage: 3.3V (NAU7802: 2.7V-5.5V)
- 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
- <1uA standby current
- 2x Qwiic Connectors
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This depends on where you are located. After the order is handed over to UPS, the delivery time in Germany is about 2-3 days, within Europe about 1 week.
We ship our orders with UPS (United Parcel Service).