May 07, 15 Thomas Jensen 18 Images Schematic Parts 172 9
This very simple module is driven purely by a computer parallel (printer) port. Almost no external components are needed; a few capacitors for voltage stabilization, a trimmer for the contrast adjustment and a resistor for the LED back-light. All communication is done directly over the parallel port data lines. The LCD is powered by an external 5 V power supply. It can’t be placed too far from the computer though since the recommended max length of a parallel cable is 15 ft.
Table of content
I used LCD Smartie to drive and control the display. Things like MP3 song information, system temperatures etc. are available right out of the box. And they have a number of plugins available. If you want to show some custom data you can write it to text files and have LCD Smartie read and display the content of those files. It’s even able to cycle though a list of screens to show multiple pages of information, very cool.
|LCD pin||Name||Description||Centronics pin||DB25 pin|
|1||Vss||GND||19 30||18 25|
|3||VLc||Contrast (to a 10k variable resistor)|
|5||R/W||Read/Write (to GND)|
|15||VB+||Backlight (120 ohm to 5V)|
|16||VB-||Backlight (to GND)|
- I/O module driven by a computer parallel port
- Light sensor with LED display
- Fan and temperature controller with LCD
- Created Nov 25, 2007
- Last modified 3 months ago