Start of section Production, amateur Radio amateurs Aircraft model, rocket-model Useful, entertaining	Stealth Master Electronics Physics Technologies Inventions	Secrets of the cosmos Secrets of the Earth Secrets of the Ocean Tricks Map of section
Use of the site materials is allowed subject to the link (for websites - hyperlinks)

Scheme of connecting different devices through
Printer port (LPT)

The LPT port on the computer is used to control the printer. It can be successfully used to control a device.

To explain the work we use the control circuit of eight LEDs.

As you know LPT port consists of 25 pins. In the work of this scheme, all 25 conclusions are optional. It is enough to use eight pins to control the LEDs. The connection diagram is shown below.

2 D0 3 D1 4 D2 5 D3 6 D4 7 D5 8 D6 9 D7 Eight control pins

Resistors with a resistance of 470 Ohm. LEDs should be used with a small current consumption.

An example of a control program you can download here . The program works in the MS-DOS system. It also works in Borland Pascal 7.0 code when unloading into the compiled program.

Program lpt1_output;

Uses Dos;

Var
Addr: word;
Data: byte;
E: integer;

Begin
Addr: = MemW [$ 0040: $ 0008];
Val (ParamStr (1), data, e);
Port [addr]: = data;
End.

In addition to controlling the LEDs, it is also possible to control the electromagnetic relay by connecting it through the circuit shown below.

Attention!

Date of publication 19.04.2003gg.

NEW ARTICLES AND PUBLICATIONS
	The technology of manufacturing universal couplings for unbreakable, threadless, flossless connection of pipe sections in high pressure pipelines (video is available )
	Technology of oil and oil products cleaning
	On the possibility of moving a closed mechanical system at the expense of internal forces
	Fluorescence in thin dielectric channels
	The relationship between quantum and classical mechanics
	Millimeter waves in medicine. A New Look. MMV therapy
	Magnetic engine
	Heat source based on pump units