I would like to convert a few of my LCD's here to a serial interface, I am looking on ebay at some different ones available at a very low cost but am unsure of what I need to be looking for. For example there is one that is listed as "IIC/I2C/TWI/SPI serial interface board module 5volt" however they dont give any other details or datasheets, looking at the picture there are only 4 pins, +5, gnd, SDA, SCL. which looking at my SPI help guide doesnt even list SDA and SCL so I am assuming thats the I2C names.


Can this board be used with SPI as they claim?
Which is better/easier to use I2C or SPI?
what do I need to search for (hardware interface board) if I wanted to use a simple SEROUT2 command to drive the LCD?

If anyone has links to sites that I can get a board for under 5USD other than ebay let me know, prefer free shipping.
Not promoting this ebay page but want to show what I am looking at so someone can tell me if this is what I need.
Ebay SPI Link
I am hoping to find one without the headers preattached.