FILE: LED.EXE: Light Emitting Diode Character Display Sample

 Last reviewed: December 11, 1997
Article ID: Q175537
The information in this article applies to:
  • Microsoft Visual Basic Professional and Enterprise Editions for Windows, version 5.0

SUMMARY

LED.EXE is a Visual Basic control that emulates a light-emitting diode display, such as those found in digital clocks and meters. The user can either assign a Value to the LED, which will be displayed, or the user can actually assign a ValueMask to the LED, which allows for turning on individual segments of the LED. You can turn on any of the seven individual segments to allow you to display letters or numbers.

The project for this control can be downloaded from the Visual Basic Owner's site at http://premium.microsoft.com/download/vbasic/led.exe. Only registered users of Visual Basic can access this site.

MORE INFORMATION

The following is an excerpt from the readme.txt shipped with the sample that covers some of the technical details of this sample.

Definitions

The following properties are available with the LED control:

  • LEDColorOn - Assigns the OLE_Color that will be used for the LED 
                     segments that are on.
  • LEDColorOff - Assigns the OLE_Color that will be used for the LED 
                     segments that are off.
  • ShowBorder - A Boolean that indicates whether or not to draw a border 
                     around the control.
  • ShowDecimal - A Boolean that indicates whether or not the decimal 
                     indicator is on or off.
  • ShowDigit - A Boolean that indicates whether the entire LED should be 
                     on or off. Setting this to False will provide a "clear"
                 LED, with all segments being set to off.  NOTE: This does
                 not effect the decimal; use the ShowDecimal to turn the
                 decimal off.
  • Value - An integer that holds the value of the LED. If 
                     ValueIsMask is set to False, then the range of Value is 0
                 to 9. If ValueIsMask is set to True, then the range of
                 Value is 0 to 127.
  • ValueIsMask - A Boolean that indicates whether the Value property will 
                     be used as a single-digit to display on the LED, or that
                 Value is actually a binary-mask, indicating which segments
                 on the LED are to be "turned on".

LED Display

This is a diagram of the "mask values" for the LED: 

          ---1---
         |       |
         |       |
         8       16
         |       |
         |       |
          ---2---
         |       |
         |       |
         32      64
         |       |
         |       |
          ---4---
To create a "unique" display, just add up the numbers for the segments you want turned on, set ValueIsMask to True, and assign the value to Value. A few examples would be: 

      A      123
      C       45
      E       47
      F       42
      H      122
      -        2
      _        4

Keywords          : vb5all
Version           : WINDOWS:5.0
Platform          : WINDOWS

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Last reviewed: December 11, 1997
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