oLEDB Object

Description
Operation
Properties

Examples
Related
Version History & Bug list

An oLEDB Object is a Hardware Object that uses a single digital I/O lines to control an LED with various blinking capabilities.

The following table lists the size and availability of the oLEDB Object.

	Object	Size	Description	A1	A2	B1	B2	C1
	oLEDB	3 Bytes	Controls an LED light.				x	x

Operation:

An oLEDB Object controls an LED by outputting a control signal on on the I/O line specified by the IOLine property.

The Blink property controls a low-speed blinking function. If Blink is set to 0, then the LED glows continuously. If Blink is 1, then the LED blinks once a second. If Blink is 2, then the LED blinks 4 times a second. And if blink is 3, then the LED blinks twice at four times a second and then remains off for 1/2 a second then repeats.

The Operate property specifies if the "on" portion of the control signal is generated. When the Operate property is set to 1, the oLED Object starts generating and outputting the "on" portion at the blink rate specified by the Blink property. When the Operate property is set to 0, the "on" portions are are discontinued and the specified I/O Line is set off.

Properties:

The following table lists the properties of the oLEDB Object:

Property
Description

Operate

A value that selects if the LED is on or off.

Object Class: oOperate Value Range: 0 - 1

Data Type: Numeric Default Value: 0

Operate Constant Description

0 cvOff The LED is off.

1 cvOn The LED is on.

IOLine

A value that specifies which I/O Line is used to control the LED.

Object Class: oIOLine Value Range: 0 - 31

Data Type: Numeric Default Value: 0

Some I/O Lines have special purposes. Be sure to see oIOLine help file for details.

Blink

A value that selects if and how the LED blinks.

Object Class: oSelect0to3 Value Range: 0 - 3

Data Type: Numeric Default Value: 0

Style Description

0 Solid On.

1 Blink at 1 Hz.

2 Blink at 4 Hz.

3 Blink twice at 4 Hz, off for 1/2 Second, Repeat.

DIO

The I/O function object used to control the LED.

Object Class: oDIO1RW Value Range: 0 - 1

Data Type: Numeric Default Value: 0

Address

Returns a pointer to the address of the oCounter Object instance.

Object Class: oAddress Value Range: 0 - 127

Data Type: Pointer (Read Only) Default Value: Address of Object

Example:

The following examples use the oLEDB Object.

Visual Basic Syntax

C and Java Syntax

'This program causes an LED 
'on I/O Line 7 to blink.

Dim A As New oLEDB

Sub Main()
  A.IOLine = 7
  A.Operate = cvTrue
  A.Blink = 1
End Sub

//This program causes an LED 
//on I/O Line 7 to blink.

oLEDB A = New oLEDB;

Void Main(Void){
  A.IOLine = 7;
  A.Operate = cvTrue;
  A.Blink = 1;
}

Basic Syntax

'This program causes an LED 
'on I/O Line 7 to blink.

A As oLEDB(7,1,cvOn)