Hi folks.
I purchased this display on ebay: http://www.ebay.com/itm/161166910105 or http://www.sureelectronics.net/goods.php?id=2591
I know that it is i2c and there are 2 HT16k33 chips on the board.
Does anyone know how to control it with arduino.
The documentation is somewhat sparse.
images of the display are attached.
Any help is appreciated.
What's the Holtek datasheet says it needs?
Post the published doc's you do have.
I'we attached the documentation that was on the ebay item.
I have had a look at Shure Display, they have only the same documents.
http://www.sureelectronics.net/goods.php?id=2591
Found this documentation on the HT16K33 chip http://www.adafruit.com/datasheets/ht16K33v110.pdf
I'm afraid i'm not able to deduce a working program from that documentation 
Adafruit has a LED Backpack library GitHub - adafruit/Adafruit_LED_Backpack: Adafruit LED Backpack Library for our various LED backpacks.
It has references to HK16K33 but i was unable to get it to work.
Also i dont know what to put in the address on the I2C.
@oddmar,
FYI, in case you are not already aware, when you post for an issue like this it really helps us (saves time) if you tell us what you have done
already (if anything) in an attempt to get the device working.
ie:
A- I am researching the device (have not tried anything)
B- I have tried the following :
a,
b,
c.
So what have you tried ? (SITREP: Situation Report)
You know it requires +12V, but do you know how to test an I2C display using the I2C scanner, followed by the I2C guesser ?
http://playground.arduino.cc/Main/I2cScanner
SEE REPLY#7
http://forum.arduino.cc/index.php?topic=196991.0
Do you understand about the address switch ? (DO YOU KNOW HOW TO USE IT (AND WHEN & WHY) ?)
Thank you for the info
I tried the i2c scanner and found the displays right away
There are four of them since i have 2 modules with 2 chips each.
Address is 0x70, 0x71, 0x72,0x73.
Then i tried the adafruit led backpack example again, and there are now some bits showing.
Still have some ways to go on getting characters setup and so on.
The adafruit library is designed for the 8x8 dot matrix displays, the once i have are 5x7.
At this point the only lead you have is the HT16K33 datasheet for the 16*8 display.
In the future. Don't buy anything from anywhere unless you have the data to back it up. Often things on ebay are cheep because no one knows how to make them work.
