How to connect 12 LEDs to the computer's parallel port (LPT)
Content
Facilities for LED
Circuit diagram
Panel example
Photos
BIOS settings
^ Facilities for LED
In first I need 1 led.
Find motherboard's LPT port. Locate pin labels.
Check numbers.
Join LED to pins 2 and 18.
Now I can use WndLpt to control this LED.
^ Circuit diagram for 12 LEDs
I can directly connect up to 12 LEDs to the LPT port. It's very simple.
Some people like to connect only eight LEDs. It's not problem. The WndLpt program can manage any number of LEDs from 1 to 12.
It's time to make following circuit. We see face of motherboard's LPT port or DB25F Face (or DB25M Back side) on it.
click to enlarge
Same circuit otherwise.
^ LEDs panel example
It is a good day to mount the LEDs on the panel.
I take any dark plastic surface and drill 12 holes on a circle.
I aspire to that view.
^ Photo session
Hole
 |
Led
 |
Panel with 12 LEDs, face.
Back side.
Map circuit to panel.
How to fix led.
DB-25M Connector
DP-25C case for DB-25M
Join DP-25C and DB-25M
Male connector for LPT port (DP-25C and DB-25M)
Night
^ BIOS settings — only if LEDs glow with low brightness level
Enter to the BIOS. Set this parameters:
[Integrated Peripherals]
Onboard Parallel Port = Enabled or 0x378h
Parallel Port Mode = EPP
Select Save & Exit Setup and press Y.
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