Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram:

Characteristic	Locus
Inheritance	object > Mpr121
Implements	II2cPeripheral
Inherited Members	object.Equals(object) object.Equals(object, object) object.GetHashCode() object.GetType() object.MemberwiseClone() object.ReferenceEquals(object, object) object.ToString()
Namespace	Meadow.Foundation.Sensors.Hid
Assembly	Mpr121.dll

Syntax

public class Mpr121 : II2cPeripheral

Constructors

Mpr121(II2cBus, byte, int, Mpr121Configuration?)

Create a new MPR121 keypad object.

Declaration

public Mpr121(II2cBus i2cBus, byte address = 90, int refreshPeriod = -1, Mpr121.Mpr121Configuration? configuration = null)

Parameters

Type	Name	Description
II2cBus	i2cBus
byte	address
int	refreshPeriod
Mpr121.Mpr121Configuration	configuration

Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram:

Fields

i2cComms

I2C Communication bus used to communicate with the peripheral

Declaration

protected readonly II2cCommunications i2cComms

Field Value

Type	Description
II2cCommunications

Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram:

Properties

DefaultI2cAddress

The default I2C address for the peripheral

Declaration

public byte DefaultI2cAddress { get; }

Property Value

Type	Description
byte

Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram:

RefreshPeriod

Gets or sets the period in milliseconds to refresh the channels statuses.

Declaration

public int RefreshPeriod { get; set; }

Property Value

Type	Description
int

Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram:

Methods

ReadChannelStatus(Channels)

Reads the channel status of MPR121 controller.

Declaration

public bool ReadChannelStatus(Mpr121.Channels channel)

Parameters

Type	Name	Description
Mpr121.Channels	channel	The channel to read status.

Returns

Type	Description
bool

Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram:

ReadChannelStatuses()

Reads the channel statuses of MPR121 controller.

Declaration

public IReadOnlyDictionary<Mpr121.Channels, bool> ReadChannelStatuses()

Returns

Type	Description
IReadOnlyDictionary<Mpr121.Channels, bool>

Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram:

Events

ChannelStatusesChanged

Notifies about a the channel statuses have been changed. Refresh period can be changed by setting PeriodRefresh property.

Declaration

public event EventHandler<ChannelStatusChangedEventArgs> ChannelStatusesChanged

Event Type

Type	Description
EventHandler<ChannelStatusChangedEventArgs>

Remarks

Mpr121
Status
Source code	GitHub
Datasheet(s)	GitHub
NuGet package

Code Example

public override Task Initialize()
{
    Resolver.Log.Info("Initialize...");

    var sensor = new Mpr121(Device.CreateI2cBus(Meadow.Hardware.I2cBusSpeed.Standard), 90, 100);
    sensor.ChannelStatusesChanged += Sensor_ChannelStatusesChanged;

    return Task.CompletedTask;
}

private void Sensor_ChannelStatusesChanged(object sender, ChannelStatusChangedEventArgs e)
{
    string pads = string.Empty;

    for (int i = 0; i < e.ChannelStatus.Count; i++)
    {
        if (e.ChannelStatus[(Mpr121.Channels)i] == true)
        {
            pads += i + ", ";
        }
    }

    var msg = string.IsNullOrEmpty(pads) ? "none" : (pads + "touched");
    Resolver.Log.Info(msg);
}

Sample project(s) available on GitHub

Wiring Example

To wire a Mpr121 to your Meadow board, connect the following:

Mpr121	Meadow Pin
GND	GND
SCL	D08 (SCL)
SDA	D07 (SDA)
VCC	3V3

It should look like the following diagram: