https://github.com/norbertkiszka/simplest-lpt-led-clock

Easiest led 7-segment display driver on lpt without any IC's or transistors. Shows time and data from text file.
https://github.com/norbertkiszka/simplest-lpt-led-clock

Last synced: about 2 months ago
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Easiest led 7-segment display driver on lpt without any IC's or transistors. Shows time and data from text file.

• Host: GitHub
• URL: https://github.com/norbertkiszka/simplest-lpt-led-clock
• Owner: norbertkiszka
• License: gpl-2.0
• Created: 2017-01-30T17:47:01.000Z (almost 8 years ago)
• Default Branch: master
• Last Pushed: 2017-01-30T20:08:00.000Z (almost 8 years ago)
• Last Synced: 2024-02-18T05:23:33.415Z (11 months ago)
• Language: C
• Homepage:
• Size: 281 KB
• Stars: 0
• Watchers: 0
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
## Required hardware

1. 4-digit 7-segment led display with common cathode (common anode is not supported).

2. Eight ~100 Ohm resistors.

3. Any wire to make 12 connections.

4. PCB or prototype board - eventually without it...

5. DB25 male connector - or simply put wires into lpt socket...

## Conection

LPT PIN NUM ------ display

1 (STROBE)         Cathodes - digit 1 (pin 12)

14 (AUTO FEED)     Cathodes - digit 2 (pin 9)

16 (INIT)          Cathodes - digit 3 (pin 8)

17 (SELECT)        Cathodes - digit 4 (pin 6)

2 (D0)             A

3 (D1)             B

4 (D2)             C

5 (D3)             D

6 (D4)             E

7 (D5)             F

8 (D6)             G

9 (D7)             Dot



![Schema](https://raw.githubusercontent.com/norbertkiszka/simplest-lpt-led-clock/master/Schema.png)

## Photos

![Temp](https://raw.githubusercontent.com/norbertkiszka/simplest-lpt-led-clock/master/photo/temp_from_api.jpg)

![Clock](https://raw.githubusercontent.com/norbertkiszka/simplest-lpt-led-clock/master/photo/clock.jpg)

![LPT connection](https://raw.githubusercontent.com/norbertkiszka/simplest-lpt-led-clock/master/photo/lpt.jpg)

## License

[GPL V2](https://www.gnu.org/licenses/old-licenses/gpl-2.0.html) - included with repository in text format.

7-segment-4-digit-red-12-pin-pinout-1.jpg - this schema was taken from mklec.com and I'm not owner of it.