HELP: RARE 9-Digit LED Display - Arduino Code and Wiring Needed

Using Arduino Displays
1

Hi, is there anybody here that has experience with 9-digit 7-segment LED displays driven by Arduino (Uno)? These are very rare types of displays...

Basically, I bought this one new on eBay, but there is no diagram or nothing that came with it.

There is a number on the side wall of the display, see photos.

Can you help me getting the inner LED connection scheme for this one, a wiring diagram to connect it to Arduino Uno, and some basic code to light the digits and the dots by Arduino?

I know multiplexing will be required...

ANY HELP APPRECIATED - I must do a project with this little guy lighting the numbers in time sequence from 0 to 128 (three times with three digits, independently) and also lighting the dots next to each third digit.

Any advice, link, part number sheet, or other insight greatly appreciated!

led1.jpg
led1.jpg800×517 44.5 KB

led2.jpg
led2.jpg800×536 58.8 KB

led3.jpg
led3.jpg800×428 76 KB

2

Go on. Use some imagination. 8 pins for 8 segments. 9 pins for digit common pins.

You just have identify whether it is common cathode or common anode.

There is plenty of code showing how to multiplex 4-digits or 8-digits. Just adapt for 9-digits.

Note that the Arduino can supply a modest current for the segments. You will need transistors or a driver chip for the 'commons'.

David.

3

Get a multimeter and run in diode testing mode. Stick one probe on a pin, move the other one around the other pins. See what lights up. Repeat for all pins. This will tell you absolutely everything about the display. Which pins are anode/cathode which segment/digit they control.

4

As others stated, it will be really simple to use it.

Also, it's not rare in any way.

// Per.

5

from
http://www.toyo-led.com/wp-content/uploads/2014/11/Part-Number-System-for-Displays-1.pdf
and
http://www.toyo-led.com/wp-content/uploads/2013/12/E60361-LI.pdf
it appears to be common cathode, some idea of the wiring may come from the six digit version in the second link

Marsha

6

I know multiplexing will be required...

There's a whole forum section devoted to "LEDs and Multiplexing" so you may find some more tips there as well.

Don