I2C LCD MODULE FOR 16x2 and 16x4 lcd...
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These convenient devices are used to give HD44780-compatible interface LCD modules a serial interface via the I2C bus. This allows you to control the LCD with only two data wires from your microcontroller (and power of course).
We may send one of two versions of this device - the difference is the controller IC. If you have the PCF8574T. the default I2C bus address is 0x27. If you have the PCF8574AT the default I2C bus address is 0x3F.
A jumper on the back controls power to the backlight, and a contrast potentiometer is also fitted.
I2C Address Setup
The LCD2004 board utilized the PCF8574 I/O expander. This nifty little chip provides eight bits of parallel I/O addressable by a I2C bus address – 0x00 to 0x27. SainSmart tied all address leads to Vcc, so the LCD2004 board’s I2C address is permanently fixed at hex 27. This is rather limiting since no additional LCD2004s can be added to the bus. Anyway, you simply address the board and write an eight bit value which is then presented on the output pins of the PCF8574, which, in this case, are connected to the HD44780 based LCD screen.
Controlling your I2C Display with Arduino
// Set the LCD address to 0x27 for a 16 chars and 2 line display
LiquidCrystal_I2C lcd(0x27, 16, 2);
// initialize the LCD
// Turn on the blacklight and print a message.
// Do nothing here...
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