Remarks

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

A seven-segment display is a form of electronic display device used to show decimal numbers. These displays are widely used in digital clocks, electronic meters, basic calculators, and other electronic devices that display numerical information.

The SevenSegment driver is used to represent a 7-segment display controlled via GPIO.

The displays are simply a collection of single color leds in a pre-configured solutions. The segments are commonly referred to using letters, the top segment is A, and increase alphabetically as you move clockwise around the display. The center segment is G and the decimal or period is dp.

The pinouts vary from device to device, check the documentation to map the pinouts to a specific segment. The come in a wide selection of colors and may be common anode or common cathode.

Purchasing

You can get 7-segment displays from the following supplier(s):

• Digi-Key
• Elmwood Electronics

Code Example

SevenSegment sevenSegment;

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

    sevenSegment = new SevenSegment
    (
        portA: Device.CreateDigitalOutputPort(Device.Pins.D14),
        portB: Device.CreateDigitalOutputPort(Device.Pins.D15),
        portC: Device.CreateDigitalOutputPort(Device.Pins.D06),
        portD: Device.CreateDigitalOutputPort(Device.Pins.D07),
        portE: Device.CreateDigitalOutputPort(Device.Pins.D08),
        portF: Device.CreateDigitalOutputPort(Device.Pins.D13),
        portG: Device.CreateDigitalOutputPort(Device.Pins.D12),
        portDecimal: Device.CreateDigitalOutputPort(Device.Pins.D05),
        isCommonCathode: false
    );

    return base.Initialize();
}

public override Task Run()
{
    sevenSegment.SetDisplay(character: '1', showDecimal: true);

    return base.Run();
}

Sample project(s) available on GitHub

Wiring Example

To wire a Common Cathode Seven Segment Display (like the 5161AS) to your Meadow board, connect the following:

SevenSegment	Meadow Pin
portA	D14
portB	D15
PortC	D06
PortD	D07
PortE	D08
PortF	D13
PortG	D12
portDecimal	D05
Common Cathode	GND

It should look like the following diagram:

Characteristic	Locus
Inheritance	System.Object > SevenSegment
Namespace	Meadow.Foundation.Displays.Led
Assembly	SevenSegment.dll

Syntax

public class SevenSegment : object

Constructors

SevenSegment(IDigitalOutputPort, IDigitalOutputPort, IDigitalOutputPort, IDigitalOutputPort, IDigitalOutputPort, IDigitalOutputPort, IDigitalOutputPort, IDigitalOutputPort, Boolean)

Creates a SevenSegment connected to the especified IDigitalOutputPorts

Declaration

public SevenSegment(IDigitalOutputPort portA, IDigitalOutputPort portB, IDigitalOutputPort portC, IDigitalOutputPort portD, IDigitalOutputPort portE, IDigitalOutputPort portF, IDigitalOutputPort portG, IDigitalOutputPort portDecimal, bool isCommonCathode)

Parameters

Type	Name	Description
IDigitalOutputPort	portA	Digital input port for pin A
IDigitalOutputPort	portB	Digital input port for pin B
IDigitalOutputPort	portC	Digital input port for pin C
IDigitalOutputPort	portD	Digital input port for pin D
IDigitalOutputPort	portE	Digital input port for pin E
IDigitalOutputPort	portF	Digital input port for pin F
IDigitalOutputPort	portG	Digital input port for pin G
IDigitalOutputPort	portDecimal	Digital input port for decimal pin
System.Boolean	isCommonCathode	Is the display using common cathod (true) or common annode (false)

SevenSegment(IPin, IPin, IPin, IPin, IPin, IPin, IPin, IPin, Boolean)

Creates a SevenSegment connected to the especified IPins to a IODevice

Declaration

public SevenSegment(IPin pinA, IPin pinB, IPin pinC, IPin pinD, IPin pinE, IPin pinF, IPin pinG, IPin pinDecimal, bool isCommonCathode)

Parameters

Type	Name	Description
IPin	pinA	Pin A
IPin	pinB	Pin B
IPin	pinC	Pin C
IPin	pinD	Pin D
IPin	pinE	Pin E
IPin	pinF	Pin F
IPin	pinG	Pin G
IPin	pinDecimal	Pin decimal
System.Boolean	isCommonCathode	Is the display using common cathod (true) or common annode (false)

Methods

SetDisplay(SevenSegment.CharacterType, Boolean)

Displays the specified character

Declaration

public void SetDisplay(SevenSegment.CharacterType character, bool showDecimal = false)

Parameters

Type	Name	Description
SevenSegment.CharacterType	character
System.Boolean	showDecimal

SetDisplay(Char, Boolean)

Displays the especified valid character

Declaration

public void SetDisplay(char character, bool showDecimal = false)

Parameters

Type	Name	Description
System.Char	character
System.Boolean	showDecimal