dotnet add package Meadow.Foundation.ICs.IOExpanders.Pcx857x --version
NuGet\Install-Package Meadow.Foundation.ICs.IOExpanders.Pcx857x -Version
This command is intended to be used within the Package Manager Console in Visual Studio, as it uses the NuGet module's version of Install-Package.
<PackageReference Include="Meadow.Foundation.ICs.IOExpanders.Pcx857x" Version="" />
For projects that support PackageReference, copy this XML node into the project file to reference the package.
paket add Meadow.Foundation.ICs.IOExpanders.Pcx857x --version
#r "nuget: Meadow.Foundation.ICs.IOExpanders.Pcx857x,"
#r directive can be used in F# Interactive and Polyglot Notebooks. Copy this into the interactive tool or source code of the script to reference the package.
// Install Meadow.Foundation.ICs.IOExpanders.Pcx857x as a Cake Addin
#addin nuget:?package=Meadow.Foundation.ICs.IOExpanders.Pcx857x&version=

// Install Meadow.Foundation.ICs.IOExpanders.Pcx857x as a Cake Tool
#tool nuget:?package=Meadow.Foundation.ICs.IOExpanders.Pcx857x&version=


Pcx857x I2C digital input/output expander (Pca8574, Pca8575, Pcf8574, Pcf855)

The Pcx857x library is included in the Meadow.Foundation.ICs.IOExpanders.Pcx857x nuget package and is designed for the Wilderness Labs Meadow .NET IoT platform.

This driver is part of the Meadow.Foundation peripherals library, an open-source repository of drivers and libraries that streamline and simplify adding hardware to your C# .NET Meadow IoT applications.

For more information on developing for Meadow, visit

To view all Wilderness Labs open-source projects, including samples, visit


You can install the library from within Visual studio using the the NuGet Package Manager or from the command line using the .NET CLI:

dotnet add package Meadow.Foundation.ICs.IOExpanders.Pcx857x


private Pca8574 device;

public override Task Initialize()
    device = new Pca8574(Device.CreateI2cBus(1), 0x20, Device.Pins.D01);

    return base.Initialize();

public override Task Run()

    return Task.CompletedTask;

private void TestDigitalOutputPorts(int loopCount)
    var out00 = device.CreateDigitalOutputPort(device.Pins.P0);
    var out01 = device.CreateDigitalOutputPort(device.Pins.P1);
    var out02 = device.CreateDigitalOutputPort(device.Pins.P2);
    var out03 = device.CreateDigitalOutputPort(device.Pins.P3);
    var out04 = device.CreateDigitalOutputPort(device.Pins.P4);
    var out05 = device.CreateDigitalOutputPort(device.Pins.P5);
    var out06 = device.CreateDigitalOutputPort(device.Pins.P6);
    var out07 = device.CreateDigitalOutputPort(device.Pins.P7);

    var outputPorts = new List<IDigitalOutputPort>()
        out00, out01, out02, out03,
        out04, out05, out06, out07,

    foreach (var outputPort in outputPorts)
        outputPort.State = true;


    for (int l = 0; l < loopCount; l++)
        // loop through all the outputs
        for (int i = 0; i < outputPorts.Count; i++)
            // turn them all off


            // turn them all on

            // turn on just one
            Resolver.Log.Info($"Update pin {i} to {true}");
            outputPorts[i].State = true;

            // turn off just one
            Resolver.Log.Info($"Update pin {i} to {false}");
            outputPorts[i].State = false;

    // cleanup
    for (int i = 0; i < outputPorts.Count; i++)

How to Contribute

Need Help?

If you have questions or need assistance, please join the Wilderness Labs community on Slack.

About Meadow

Meadow is a complete, IoT platform with defense-grade security that runs full .NET applications on embeddable microcontrollers and Linux single-board computers including Raspberry Pi and NVIDIA Jetson.


Use the full .NET platform and tooling such as Visual Studio and plug-and-play hardware drivers to painlessly build IoT solutions.


Utilize native support for WiFi, Ethernet, and Cellular connectivity to send sensor data to the Cloud and remotely control your peripherals.


Instantly deploy and manage your fleet in the cloud for OtA, health-monitoring, logs, command + control, and enterprise backend integrations.

Product Compatible and additional computed target framework versions.
.NET net5.0 was computed.  net5.0-windows was computed.  net6.0 was computed.  net6.0-android was computed.  net6.0-ios was computed.  net6.0-maccatalyst was computed.  net6.0-macos was computed.  net6.0-tvos was computed.  net6.0-windows was computed.  net7.0 was computed.  net7.0-android was computed.  net7.0-ios was computed.  net7.0-maccatalyst was computed.  net7.0-macos was computed.  net7.0-tvos was computed.  net7.0-windows was computed.  net8.0 was computed.  net8.0-android was computed.  net8.0-browser was computed.  net8.0-ios was computed.  net8.0-maccatalyst was computed.  net8.0-macos was computed.  net8.0-tvos was computed.  net8.0-windows was computed. 
.NET Core netcoreapp3.0 was computed.  netcoreapp3.1 was computed. 
.NET Standard netstandard2.1 is compatible. 
MonoAndroid monoandroid was computed. 
MonoMac monomac was computed. 
MonoTouch monotouch was computed. 
Tizen tizen60 was computed. 
Xamarin.iOS xamarinios was computed. 
Xamarin.Mac xamarinmac was computed. 
Xamarin.TVOS xamarintvos was computed. 
Xamarin.WatchOS xamarinwatchos was computed. 
Compatible target framework(s)
Included target framework(s) (in package)
Learn more about Target Frameworks and .NET Standard.

NuGet packages (1)

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Version Downloads Last updated 0 3/1/2024
1.9.0 84 2/27/2024 63 2/23/2024 63 2/22/2024 49 2/20/2024 70 2/13/2024 52 2/6/2024 61 2/1/2024 58 1/24/2024 122 1/20/2024
1.8.0 161 1/16/2024
1.7.0 144 1/9/2024 87 1/3/2024 82 12/27/2023 88 12/20/2023 84 12/19/2023 86 12/12/2023
1.6.0 244 12/6/2023 104 12/4/2023
1.5.0 146 11/28/2023 103 11/28/2023 103 11/27/2023 114 11/8/2023 87 11/7/2023 97 11/1/2023 171 10/31/2023 86 10/25/2023 92 10/24/2023 103 10/17/2023 109 10/10/2023 78 10/5/2023 103 10/4/2023 91 10/3/2023 92 10/3/2023 91 9/30/2023 105 9/30/2023
1.3.4 160 9/26/2023 106 9/21/2023 86 9/20/2023 103 9/19/2023 94 9/15/2023 108 9/14/2023
1.3.2-beta 119 9/13/2023 71 9/5/2023