help on vqc10, 4 segment 5x7 led display

Hello,
i need some help with VQC10 LED display,
i've found one, and it looks very nice. I have datasheet:
https://www.google.pl/url?sa=t&source=web&rct=j&url=http://www.decadecounter.com/vta/pdf/vqc10.pdf&ved=2ahUKEwjh_bzc3cDZAhVDFSwKHchWCOIQFjACegQIARAB&usg=AOvVaw3Ip64IwwvKU1eGsOwKSJ8h
also search in google shows hits in german, russian, and czech languages, bun nothing realky I would know how to use :frowning:
but besides connection to the array, i do not understand it much.
after connecting it (on Z through some resistors) i was able only to control (more or less) line across. but not much more :frowning:

is there anyone that could help me to start with it?

thank you.
Max

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html

A description from here;
http://www.industrialalchemy.org/articleview.php?item=1037

In spite of prevailing evidence, not all LED smart displays were made by Litronix and Hewlett-Packard. RFT, based in Germany, also made smart displays such as this one, the VQC10.
Packaged in an attractive red molded epoxy package, the VQC10 has four characters, each containing 35 LED dies arranged in a 5x7 matrix.
Unlike many other smart displays, the VQC10 has no built in character driver or other advanced features.
The display uses an extremely convoluted control scheme, rows across all digits are ganged together and controlled manually, while each column can be selected by sending a 9 bit address in parallel to the display's driver circuitry.
The home experimenter should take note that the VQC10 has wider pin spacing than most DIP LED displays, and will not fit in a conventional breadboard or socket.

Help quite a bit.


Can you please tell us your electronics, programming, Arduino, hardware experience?

Thanks.. Tom.. :slight_smile:

Hi,
A quick google translate produces this.
vpinoouts.jpg

The “clock voltage” looks like they are the digit select/write lines.

Looks like a lot of software needed to load it with digits and to multiplex it.

There are other 4digit 7seg displays that will be easier to program and will not need software multiplexing.

Tom… :slight_smile:

Hi Tom, thank you for replay, as per my experience, it is nothing very advanced, i did some led blinking, DHT with BT adapters, and i could swear i did posted loooong time ago on this forum but for some reason none of my credentials worked, thus new account :slight_smile:
i have few uno’s, mega’s, nano’s that i did some simple programming for my son (like police lights acrivated by remote - i know, very simple, but that is my level :p)
since I’m a sucker on led/vfd/nixie/numitron displays, it was too good of a deal to pass on the flea market ( less than a dollar/euro per piece). But i guess i’ll go with different way, as you suggested, easier :stuck_out_tongue: way :).
Maybe one day I’ll learn enough to tame this one, and maybe do a wristwatch :smiley:

Thank you
Max

I don't think it would be too difficult to drive, but an interesting challenge!

It looks like you could drive it with 16 pins and 7 series resistors. Unfortunately because of the design, it looks as though you will have to use a 1 to 20 multiplex ratio (i.e. column-at-a-time), which will not be very bright. You could try a 1 to 7 ratio (i.e. row-at-a-time), but you would need high-side drivers for the anodes, and you would be connecting 20 LEDs in parallel without individual series resistors, which is not advised.

PaulRB:
I don't think it would be too difficult to drive, but an interesting challenge!

I agree.
One of those projects that begs you to get it working, just because of its history, with little info and modern hardware.
Tom... :slight_smile:

Agree, but my level of knowledge is way too low for that. It’ll have to wait for its time in the parts bin :slight_smile:

he3r0:
Hello,
i need some help with VQC10 LED display,
...
is there anyone that could help me to start with it?

Hello! I have two VQC10 bought many years ago. I think I bougt them more than 30 years ago. Recent I discover them in a box. I never comisioning them. They are as new.
Thank of you, I found the old “democratic” Germany datasheet, but it is stupid. I made some tests with VQC10 and I descovered how it works. With new technology, it is easy to use. Arduino is the easyest way.
How it work: put 5V on Z1 to suplly the top row of LED-s. Put on D1,D2,D3,D4 and D5 the LED status you whant. Low for Off, high logic for On. Then strobe pin c.p. corespondind to matrix you display now. Latch of c.p. digit will memorize the D1…D5 status. Now you can change the D1 … D5, the LEDs of first row will not change.
I tested a VQC10 only on a 5V power supply. When I’ll write an Arduino program for this old and very nice display, I’ll come back

Hi,
Welcome to the forum.

Please read the first post in any forum entitled how to use this forum.
http://forum.arduino.cc/index.php/topic,148850.0.html .

Can you post your code please?
Please use code tags to make your code easy to read.

Can you please post a copy of your circuit, in CAD or a picture of a hand drawn circuit in jpg, png?

Thanks.. Tom.. :slight_smile:

Sory, yesturday I made some tests only with a power supplay to understand how the VQC10 works. I haven’t yet a schematic diagram and a code. I just light a row by Z conection then I descover the logical control of columns. I draw a first timing diagram.

I’ll come back when i’ll have news.