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A C# LED matrix display

, 4 Apr 2010 CPOL
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A C# user control which displays texts or symbols as if they were displayed on an LED matrix screen.


This article introduces a C# user control which displays texts or symbols as if they were displayed on an LED matrix screen. The control manages several items, an item defined by its text, its direction, and its speed. The goal of the article is to describe the key points of the control; it's not a strictly technical explanation. There are no technical difficulties. The control is presented in an application that allows the user to manage two text items.

Key points

Mutli-display items

The control manages the display of an item list. Aan item is associated to an array which defines the LED "On" and position (X, Y) on the display. On a "PaintEvent", each LED on the display is analysed to know if there is an "LedOn" point among the items that corresponds to the LED.


Custom font file

To build the "LedOn" array of an item from a text string, the control introduces a conversion function which gives the LED On array via a symbol code as an input. The function uses an XML file as the translation file from the code to the symbol. Actually, the control introduces an example file in the resources of the project. The code used is the ASCII code. Each symbol in the file is defined by the LED "On" on its lines (the LED "On" is represented by a #).

<LedMatrixSymbol SymbolCode="71" Description="G">
    <LedLine LineNumber="0" LineLedOn="_______"/>
    <LedLine LineNumber="1" LineLedOn="__###__"/>
    <LedLine LineNumber="2" LineLedOn="_#___#_"/>
    <LedLine LineNumber="3" LineLedOn="_#_____"/>
    <LedLine LineNumber="4" LineLedOn="_#_____"/>
    <LedLine LineNumber="5" LineLedOn="_#__##_"/>
    <LedLine LineNumber="6" LineLedOn="_#___#_"/>
    <LedLine LineNumber="7" LineLedOn="__###__"/>

Modification on the flow

The properties of each item (LED "On" array, speed, and direction) can be changed at any time. The properties of the display (LED colours and matrix size) are also modifiable.

LED size management

In the first version of the code, the LED size was deducted by a simple way. Each LED cell was divided in six equals parts: 1 for the border on the left (top), 4 for the LED, and 1 for the border on the right (down). This way, the minimum size for an LED cell was 6 pixels.


In the new version, the LED cell is not divided in sections. The part of the LED diameter in the LED cell is not defined by code (2/3 in previous version) but by a coefficient as a new parameter of the control. So the ratio between the border and the LED can be set from 0 to 1.



This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)


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Comments and Discussions

QuestionLong time to set an item text PinmemberEduardo Fernandez del Peloso10-Dec-14 1:24 
QuestionQuery abt LED PinmemberMember 103755756-Nov-13 19:56 
QuestionMatrice led PinmemberMember 990650112-Mar-13 21:46 
Questionits really very cool.. Pinmemberlaxmank811-Dec-12 1:43 
GeneralMy vote of 5 Pinmemberlaxmank811-Dec-12 1:39 
GeneralMy vote of 5 Pinmemberdevvvy4-Dec-12 15:10 
QuestionHow to use it ? Pinmembervincennes15-Apr-12 13:02 
GeneralMy vote of 3 PinmemberJulien Villers19-Dec-11 0:32 
GeneralMy vote of 5 PinmemberAddy Tas8-Dec-11 1:43 
GeneralMy vote of 3 PinmvpDave Kreskowiak5-Dec-11 7:14 
QuestionFont to led implementation PinmemberNimea25-Sep-11 22:44 
GeneralBug in idle scrolling? Otherwise, Awesome! PinmemberStuart Rubin27-May-11 10:10 
This is a great article. In fact, I may use the code to build a mockup/simulator for a product we're working on.
I think there may be one tiny bug in the scrolling code. In MoveItem(), for the idle case, the offset is 1. I believe it should be 0 in order to make the item actually idle.
        case ItemSpeed.Idle:
            iOffset = 1;
        case ItemSpeed.Idle:
            iOffset = 0;

GeneralMy vote of 5 Pinmembercraliaga20-May-11 10:44 
GeneralMy vote of 5 PinmemberXantilon18-Jan-11 0:05 
GeneralMy vote of 5 PinmemberSrikanth039-Dec-10 2:01 
GeneralA C# LED matrix display Pinmemberaleribrib6-Sep-10 8:03 
GeneralA C# LED matrix display Pinmemberaleribrib3-Sep-10 5:46 
GeneralRe: A C# LED matrix display PinmemberChootair6-Sep-10 2:22 
QuestionHow to use UNICODE? Pinmemberjbahn22-Aug-10 16:08 
QuestionHow to support Chinese? Pinmember432848316-May-10 18:04 
AnswerRe: How to support Chinese? Pinmembersilas_yao18-Feb-11 5:35 
GeneralGood Job Pinmemberlamasmg200212-May-10 22:38 
GeneralERROR Pinmemberlamasmg200212-May-10 22:37 
Generala simpler way PinmemberAbdollah Zawari18-Apr-10 6:25 
GeneralExcellent work Pinmemberradar_ksa18-Apr-10 0:34 

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