I have an arduinoboard and would like to connect a LCD Display.
My local electronic parts shop sold me this one:
BUT they had no data sheet at all. I am clueless how to make it work with arduino. I don t even know where to connect the power for the backlight. Nor do I know how to make it work -> display text with the help of the I2C libraries.
The only thing I know is the numbers on the back:
LCM015 R2.1 SN 102 94V
and a "Kl" maybe a vendor??
Based on what I could find, this LCD is likely an HD44780 compatible display, but it has an I2C interface in front of that chipset; without a datasheet (I couldn't find anything - a few people asking about it, though), it would be nearly impossible to figure out.
If I were you, I would return it and get your money back - if you can. If not, put the LCD in your box of "get 'round toit" items, and come back in 6 months or a year, and see if anything pops up searching again.
You may just have to chalk it up as "bad luck" (I have a few LCDs that fall into the category myself)...
Well - MikMo has solved a big part of the mystery; from the datasheet for the PCF8574 (http://www.nxp.com/documents/data_sheet/PCF8574.pdf) it looks like there are 3 address set bit lines from the chip (A0-2, pins 1-3) - so you would either have to figure that out, or program the I2C to do the HD44780 setup, and try the 8 different addresses until one of them works...
I'll have to look at my LCDs I picked up that were I2C (IIRC) - maybe they use the same I2C expander chip...