Remarks

Pcf8574
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

private Pcf8574 device;

public override Task Initialize()
{
    device = new Pcf8574(Device.CreateI2cBus(1), 0x20, Device.Pins.D01);

    return base.Initialize();
}

public override Task Run()
{
    TestDigitalOutputPorts(10);

    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;

        Thread.Sleep(1000);
    }

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

            Thread.Sleep(1000);

            // turn them all on
            device.AllOn();
            Thread.Sleep(1000);

            // turn on just one
            Resolver.Log.Info($"Update pin {i} to {true}");
            outputPorts[i].State = true;
            Thread.Sleep(250);

            // turn off just one
            Resolver.Log.Info($"Update pin {i} to {false}");
            outputPorts[i].State = false;
            Thread.Sleep(250);
        }
    }

    // cleanup
    for (int i = 0; i < outputPorts.Count; i++)
    {
        outputPorts[i].Dispose();
    }
}

Sample project(s) available on GitHub

Characteristic	Locus
Inheritance	object Pcx857x Pcx8574 > Pcf8574
Implements	IDigitalOutputController IDigitalInputController IDigitalInterruptController IPinController II2cPeripheral IDisposable
Inherited Members	Pcx8574.Pins Pcx8574.NumberOfPins Pcx8574.IsValidPin(IPin) Pcx8574.GetPin(string) Pcx8574.SetPinDirection(bool, byte) Pcx8574.GetPinState(IPin) Pcx8574.SetPinState(IPin, bool) Pcx8574.ReadState() Pcx8574.WriteState(ushort) Pcx8574.SetState(ushort) Pcx8574.ReadState8() Pcx8574.WriteState(byte) Pcx857x.GetAddressFromPins(bool, bool, bool, bool) Pcx857x.DefaultI2cAddress Pcx857x.IsDisposed Pcx857x.createdPorts Pcx857x.i2cComms Pcx857x.CreateDigitalOutputPort(IPin, bool, OutputType) Pcx857x.CreateDigitalInputPort(IPin, ResistorMode) Pcx857x.CreateDigitalInterruptPort(IPin, InterruptMode, ResistorMode) Pcx857x.CreateDigitalInterruptPort(IPin, InterruptMode, ResistorMode, TimeSpan) Pcx857x.CreateDigitalInterruptPort(IPin, InterruptMode, ResistorMode, TimeSpan, TimeSpan) Pcx857x.AllOff() Pcx857x.AllOn() Pcx857x.Dispose(bool) Pcx857x.Dispose() object.Equals(object) object.Equals(object, object) object.GetHashCode() object.GetType() object.MemberwiseClone() object.ReferenceEquals(object, object) object.ToString()
Namespace	Meadow.Foundation.ICs.IOExpanders
Assembly	Pcx857x.dll

Syntax

public class Pcf8574 : Pcx8574, IDigitalOutputController, IDigitalInputController, IDigitalInterruptController, IPinController, II2cPeripheral, IDisposable

Constructors

Pcf8574(II2cBus, byte, IDigitalInterruptPort?)

Initializes a new instance of the Pcf8574 device

Declaration

public Pcf8574(II2cBus i2cBus, byte address, IDigitalInterruptPort? interruptPort = null)

Parameters

Type	Name	Description
II2cBus	i2cBus	The I2C bus the peripheral is connected to
byte	address	The I2C bus address of the peripheral
IDigitalInterruptPort	interruptPort	The interrupt port

Remarks

Pcf8574
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

private Pcf8574 device;

public override Task Initialize()
{
    device = new Pcf8574(Device.CreateI2cBus(1), 0x20, Device.Pins.D01);

    return base.Initialize();
}

public override Task Run()
{
    TestDigitalOutputPorts(10);

    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;

        Thread.Sleep(1000);
    }

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

            Thread.Sleep(1000);

            // turn them all on
            device.AllOn();
            Thread.Sleep(1000);

            // turn on just one
            Resolver.Log.Info($"Update pin {i} to {true}");
            outputPorts[i].State = true;
            Thread.Sleep(250);

            // turn off just one
            Resolver.Log.Info($"Update pin {i} to {false}");
            outputPorts[i].State = false;
            Thread.Sleep(250);
        }
    }

    // cleanup
    for (int i = 0; i < outputPorts.Count; i++)
    {
        outputPorts[i].Dispose();
    }
}

Sample project(s) available on GitHub

Pcf8574(II2cBus, byte, IPin?)

Initializes a new instance of the Pcf8574 device

Declaration

public Pcf8574(II2cBus i2cBus, byte address, IPin? interruptPin)

Parameters

Type	Name	Description
II2cBus	i2cBus	The I2C bus the peripheral is connected to
byte	address	The I2C bus address of the peripheral
IPin	interruptPin	The interrupt pin

Remarks

Pcf8574
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

private Pcf8574 device;

public override Task Initialize()
{
    device = new Pcf8574(Device.CreateI2cBus(1), 0x20, Device.Pins.D01);

    return base.Initialize();
}

public override Task Run()
{
    TestDigitalOutputPorts(10);

    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;

        Thread.Sleep(1000);
    }

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

            Thread.Sleep(1000);

            // turn them all on
            device.AllOn();
            Thread.Sleep(1000);

            // turn on just one
            Resolver.Log.Info($"Update pin {i} to {true}");
            outputPorts[i].State = true;
            Thread.Sleep(250);

            // turn off just one
            Resolver.Log.Info($"Update pin {i} to {false}");
            outputPorts[i].State = false;
            Thread.Sleep(250);
        }
    }

    // cleanup
    for (int i = 0; i < outputPorts.Count; i++)
    {
        outputPorts[i].Dispose();
    }
}

Sample project(s) available on GitHub