Jkx@home » lcd

Lumex Graphic LCD 128×64 (S12864GSF) + AVR (Atmega32)

admin — Mon, 24 Mar 2008 14:42:53 +0000

I recently bought 2 LCD from jckrers ebay store. I have a good idea for this stuff, but first I need to run several tests. This LCD are fine and use the common KS108 controller.

My first thought was to use the avrlib, so I wired the LCD and started to use avrlib, but I quickly run into issues. In fact, I want to use some icons on, and the avrlib seems to be buggy.

After a little compile/test/run/compile, I remember an old post on a website about KS108 chips. I find it back, it’s on the science prog

This is really great, you can build some custom fonts easily (that’s exactly what i’m looking for)..

Here a couple of pics…

As you can see, I use a ATMega32 (on a futurelec card), a simple pot for the contrast, and the lumex.

I can use a mix of different fonts on the same screen.

And I can even display some pics too :)

Here the famous tux.

I still have to deal with menu and other stuff, this should be a little harder than expected, but will be nice. If somebody know a good library to use on a T6963C, please post a comment..

For users who wants high res pics, you can find them in my gallery (as usual).

Anode power supply for VFD display ( 5v to 80v stepper PSU )

admin — Tue, 26 Dec 2006 12:57:29 +0000

For my next project (another VFD clock ;), I need a small variable PSU. The main issue with the VFD display, is the power supply. In fact you need 2 differents PSU:

a 5v / 100mA for the filament
a variable 20 to 75v for anodes..

VFD tube like the IV18 need something like 20/30 volts in direct drive and 50/70 volts where they are muxed. As I can not use them in a direct drive, I need a psu that support output from 20 to 75v, by this way, I can dim the display easily and test the whole stuff in a direct.

I already have done several nixie PSU, but this time I want to build something small (doesn’t cost a lot) with really common parts. I decided to look at smaller mosfet, and I found the BS107 .. small TO92 package and 200v ;)

Here the schematic:

With this simple stuff, and a little microcontroler, you can step the output easily. You can use a 220uH inductor with a 5v VCC, or a smaller one 100uH if you have a PSU between 6v to 15v.

/Enjoy the next step

Simple negative power supply (-5V / -12V / -15V)

admin — Sat, 10 Jun 2006 13:40:24 +0000

Sometimes you need a simple negative power supply. The best example is the contrast PSU for common small LCD device. Building -5V from a battery or a wallmart supply isn’t really easy. I decided to build a small device that is able to provide -5V, -12V, -15V. I used the MAX 764/765/766 serie. Simply change the chip to provide the good output.

Here the little schematic:

And here a pic, of the result:

As you can see, this stuff is damm small, use some common parts and can be reuse across different needs. Thanks Maxim for the sample :)

I used a 220uF instead of the 120uF one, and a small inductor but you can use a bigger one, if you need greater current.