Mac LCD

Information for using small character LCDs such as the HD44780 with Mac OS X, LCDproc and Growl. And other Apple and Mac USB stuff.

Tuesday, December 5, 2006

Mac OS X USB LCD Info

Since I haven't had any LCD Kits available for a while, I thought I would clear up some details about the kit for people who want to try it on their own.

The LCD is a HD44780 compatible character LCD. It is connected to the Mac USB port using a Belkin F5U002 USB Parallel adapter. Make sure to get the correct version that uses a separate USB cable.

The pinout I used for the kit and the Mac OS X USB LCD Command Line Tool is available here: Beyond Logic Interfacing Example. With some minor changes to get power from the parallel port, the final pinout is:

Centronics
Parallel    LCD
30             1
13,14          2
30             3
36             4
29             5
1              6
2              7
3              8
4              9
5             10
6             11 
7             12
8             13
9             14

Following this pinout should allow you to use the Mac OS X USB LCD Command Line Tool on your own cable and LCD.

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2 Comments:

Anonymous miles said...

I followed your instructions for the pinout but I have a problem, the lcd is not backlight or at least it is very dim.

Instead of using an lcd adapter cable like you had included in your kit, I soldered everything to the parallel usb board; including the usb wires. It worked, I see the text that I type in the program on the lcd but the backlight is very dim. Is there anything that you can think of that I might have done wrong that would have resulted in this?

21/1/09 13:00  
Anonymous epooch said...

What is dim? The back light or the text?. The instructions I posted do not include a connection for a backlight. You can use the instructions here:

http://lcdproc.sourceforge.net/docs/stable-0-5-x-user.html#hd44780-connections-backlight.circuit

to add a backlight using the 5 volts from the USB connector.

21/1/09 13:15  

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