NAU7802 Low Power

Materials

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Example

Introduction

This example shows how to setup low power consumption on Sparkfun NAU7802.

Procedure

Connect the Load Cell to NAU7802.

  • Connect the red wire of Load Cell to RED pin (Excitation +) of NAU7802.

  • Connect the black wire of Load Cell to BLK pin (Excitation -) of NAU7802.

  • Connect the green wire of Load Cell to GRN pin (Signal +) of NAU7802.

  • Connect the white wire of Load Cell to WHT pin (Signal -) of NAU7802.

Connect the AMB82-mini to NAU7802.

  • Connect the VDD33 of AMB82-mini to 3V3 of NAU7802.

  • Connect the GND of AMB82-mini to GND of NAU7802.

  • Connect the Pin 12 (I2C_SDA pin) of AMB82-mini to SDA of NAU7802.

  • Connect the Pin 13 (I2C_SCL pin) of AMB82-mini to SCL of NAU7802.

Note

Download User Guide to understand more on pin definition.

Tip

Depending on your NAU7802 version, some may support 5V+ operating voltage—please check the official website before you connect to a 5V power supply. If your NAU7802 supports 5V+ operating voltage, connecting to V_USB instead of VDD33 tends to have less jitter effect.

The final wiring should look like the diagram below.

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Open the example in File -> Examples -> AmebaWire -> NAU7802 -> LowPower

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Compile and run the example.

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While this allows low power consumption, if you powerDown() and powerUp(), the first reading takes much longer to read after power-up. For this example, it takes around 50 ms process a reading immediately after powerDown() and 11 - 12 ms to process a reading if no powerDown() triggered.