qwiic_cy8cmbr3_py

SparkFun Qwiic CY8CMBR3 - Python Package

The SparkFun Qwiic Soil Moisture Sensor CY8CMBR3 Module provides a simple and cost effective solution for adding Soil Moisture Sensor capabilities to your project. Implementing a SparkFun Qwiic I2C interface, these sensors can be rapidly added to any project with boards that are part of the SparkFun Qwiic ecosystem.

This repository implements a Python package for the SparkFun Qwiic CY8CMBR3. This package works with Python, MicroPython and CircuitPython.

Contents

• About
• Installation
• Supported Platforms
• Documentation
• Examples

About the Package

This python package enables the user to access the features of the CY8CMBR3 via a single Qwiic cable. This includes reading soil capacitance in pF, reading soil capacitance raw counts, blinking an LED and more. The capabilities of the CY8CMBR3 are each demonstrated in the included examples.

New to qwiic? Take a look at the entire SparkFun qwiic ecosystem.

Supported SparkFun Products

This Python package supports the following SparkFun qwiic products on Python, MicroPython and Circuit python.

• SparkFun Soil Moisture Sensor Sensor - CY8CMBR3

Supported Platforms

Python	Platform	Boards
Python	Linux	Raspberry Pi , NVIDIA Jetson Orin Nano via the SparkFun Qwiic SHIM
MicroPython	Raspberry Pi - RP2, ESP32	SparkFun Pro Micro RP2350, SparkFun IoT RedBoard ESP32, SparkFun IoT RedBoard RP2350
CircuitPython	Raspberry Pi - RP2, ESP32	SparkFun Pro Micro RP2350, SparkFun IoT RedBoard ESP32, SparkFun IoT RedBoard RP2350

‍[!NOTE] The listed supported platforms and boards are the primary platform targets tested. It is fully expected that this package will work across a wide variety of Python enabled systems.

Installation

The first step to using this package is installing it on your system. The install method depends on the python platform. The following sections outline installation on Python, MicroPython and CircuitPython.

Python

PyPi Installation

The package is primarily installed using the pip3 command, downloading the package from the Python Index - "PyPi".

Note - the below instructions outline installation on a Linux-based (Raspberry Pi) system.

First, setup a virtual environment from a specific directory using venv:

python3 -m venv path/to/venv

You can pass any path as path/to/venv, just make sure you use the same one for all future steps. For more information on venv click here.

Next, install the qwiic package with:

path/to/venv/bin/pip3 install sparkfun-qwiic-cy8cmbr3

Now you should be able to run any example or custom python scripts that have import qwiic_cy8cmbr3 by running e.g.:

path/to/venv/bin/python3 example_script.py

MicroPython Installation

If not already installed, follow the instructions here to install mpremote on your computer.

Connect a device with MicroPython installed to your computer and then install the package directly to your device with mpremote mip.

mpremote mip install github:sparkfun/qwiic_cy8cmbr3_py

If you would also like to install the examples for this repository, issue the following mip command as well:

mpremote mip install github:sparkfun/qwiic_cy8cmbr3_py@examples

CircuitPython Installation

If not already installed, follow the instructions here to install CircUp on your computer.

Ensure that you have the latest version of the SparkFun Qwiic CircuitPython bundle.

circup bundle-add sparkfun/Qwiic_Py

Finally, connect a device with CircuitPython installed to your computer and then install the package directly to your device with circup.

circup install --py qwiic_cy8cmbr3

If you would like to install any of the examples from this repository, issue the corresponding circup command from below. (NOTE: The below syntax assumes you are using CircUp on Windows. Linux and Mac will have different path seperators. See the CircUp "example" command documentation for more information)

circup example qwiic_cy8cmbr3\qwiic_cy8cmbr3_ex1_basic
circup example qwiic_cy8cmbr3\qwiic_cy8cmbr3_ex2_advanced
circup example qwiic_cy8cmbr3\qwiic_cy8cmbr3_ex3_led
circup example qwiic_cy8cmbr3\qwiic_cy8cmbr3_ex4_i2c_addr
circup example qwiic_cy8cmbr3\qwiic_cy8cmbr3_ex5_multi
circup example qwiic_cy8cmbr3\qwiic_cy8cmbr3_ex6_set_range

Example Use

Below is a quickstart program to print readings from the CY8CMBR3.

See the examples directory for more detailed use examples and examples/README.md for a summary of the available examples.

import qwiic_cy8cmbr3
import sys
import time
 
def runExample():
    print("\nQwiic Template Example 1 - Basic\n")
 
    mySoilSensor = qwiic_cy8cmbr3.QwiicCY8CMBR3()
 
    if mySoilSensor.is_connected() == False:
        print("The device isn't connected to the system. Please check your connection", \
            file=sys.stderr)
        return
 
    mySoilSensor.begin()
 
    while True:
        capacitance = mySoilSensor.get_capacitance_pf()
        print("Soil Capacitance: " + str(capacitance) + " pF")
        time.sleep(1)
 
if __name__ == '__main__':
    try:
        runExample()
    except (KeyboardInterrupt, SystemExit) as exErr:
        print("\nEnding Example")
        sys.exit(0)