Hi All,

I'm looking to hook a VFD (vacuum flourescent display) externally to a Mac USB port.

I've done some checking around and the best route I've been able to come up with is this model from Matrix Orbital:

VK202-24-USB display

Of course, the drivers for that are PC only, but they recommend a driver on this page:

http://www.ftdichip.com/Drivers/FT2232CDrivers.htm

Anyone have any experience or insights into this hardware / driver combo? Once connected, can I use UNIX commands to start sending text to the display? Any "Hello World" tutorials out there that can help me get started?

Thanks in advance for any advice,

L

Post edited by: larry98765, at: 2005/09/30 21:39

That is a good question. I looked over their site and they don't have any programming examples, just the raw "this is what this is" programming stuff. Have you tried contacting their support for assistance, or a "Hello World" example to work from?

Thanks Whitlock,

Yes, I sent them a message. I will post here any insight I gain if they respond.

This guy is working on one. Although I doubt it will be done this year.
Linktacular

Yes, I had come across that page in my searches.

But I'm somewhat less wiring-savvy than that would require.

Also, I'm looking for VFD, not LCD.

But thanks for the post.

The http://www.ftdichip.com/Drivers/FT2232CDrivers.htm%3Cbr%20/%3E driver they have reccomended appear to be a USB to serial device driver, after reading through the PDF installation file on that site its bascially a way of adding a serial port to a Mac. I'm guesssing that the matrix orbital uses a similair chipset as the USB to serial adapter from that page and once installed you would have a standard serial interface to your VFD display. However at that point I think you would still have to create somthing to output data to the display over your newly created serial port.
I'm sure its possible, but its not going to be easy.

this is a link to apples example code, for controlling a serial port, its a basic command line utility, but it may give you some idea as to what you might need to to do.
http://developer.apple.com/samplecode/SerialPortSample/SerialPortSample.html

Must admit it looks past my current skill level!

Just found http://www.wildrice.com/BlueCabbie/ which may be of some help, a guy built a carMac using iTunes and a matrix orbital display, he also has the source for his control system availble as an Xcode project.

He credits http://www.harmless.de/cocoa.html#serialport this page for the help with the serial programming.

Wow, great find burtman!

Yes! Great find! Thanks!

This definitely puts me on the right track -- in fact, I have that USB --> Serial adapter in a box somewhere from when I had an old Palm handheld I needed to hook up.

I will study this BlueCabbie info with great interest.

Thanks again!

-- EDIT --

OK. I'm confused. Matrix Orbital makes USB (as opposed to serial) displays, i.e.:

http://www.matrixorbital.com/product_info.php?pName=vk20224usb&cName=lcd-character-vfds

So hooking it up won't be a problem. But in the pdf for that product, it says the following:



So once I hook it up, sending data becomes my problem. Any ideas?

Post edited by: larry98765, at: 2005/10/01 19:48

Basically however your display is connected to your mac either directly via USB or via a usb to serial convertor once you have installed the drivers your going to get an serial communictions port availble to send the data you want displayed through. That seems to be the way that most of these VFD or LCD screens work, whatever operating system you are using.

Your options as I can see them are:
Use the blueCabbie project and be content with the itunes information.
Take the source to the BlueCabbie project and adjust it to your needs. (ie learn objective c)
Start from scratch using the Apple tutorial and create your own interface. (again learn objective c)

Keep searching for somone else who has done the hard work allready.