veleek/CircuitPython_NAU7802_Async

Introduction

An async CircuitPython driver class for the NAU7802 24-bit ADC. This is a fork of the original NAU7802 driver that converts certain operations into async methods. This allows the driver to play nice with other async code especially if you're doing potentially long running operations such as reading and averaging dozens of samples. The original driver blocks all code execution while waiting for data to become available while this one will yield (a zero async sleep) to allow other code to run.

Since checking the availability of and reading data from the load cell is already non-blocking this is mostly useful for enabling non-blocking initialization, but also serves as a good example of how to read data in an async friendly way.

Dependencies

This driver depends on:

Please ensure all dependencies are available on the CircuitPython filesystem. This is easily achieved by downloading the Adafruit library and driver bundle or individual libraries can be installed using circup.

Installing to a Connected CircuitPython Device with Circup

Make sure that you have circup installed in your Python environment. Install it with the following command if necessary:

pip3 install circup

With circup installed and your CircuitPython device connected use the following command to install:

circup install cedargrove_nau7802_async

Or the following command to update an existing version:

circup update

Usage Example

import asyncio
import board
from cedargrove_nau7802_async import NAU7802

# Instantiate NAU7802 ADC
nau7802 = await NAU7802.create_async(board.I2C(), address=0x2A, active_channels=2)