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1  Using Arduino / Displays / Re: Arduino UNO R3 + PCF8574P + HD44780 on: October 11, 2012, 08:09:30 am
The library by Mario H. is the one that's published in the Arduino Playground. On several sites where I2C LCD's are sold, you can also download a library but 9 out of 10 they are the DFRobot library.


Concerning my response about Google: You asked about which lead is the emitter on the transistor. I just tried to be smart.  smiley-lol
2  Using Arduino / Displays / Re: Arduino UNO R3 + PCF8574P + HD44780 on: October 10, 2012, 03:34:56 am
That's why a statement such as this is used.  You have to use your pin numbers, in the proper order, inside the parentheses.

myLCD LiquidCrystal_I2C ( 0x20, 4, 5, 6, 0, 1, 2, 3, 7, POSITIVE );
Which library do you use? The libraries of Mario H. and DFRobot don't provide the ablitiy to provide specific IO pins for the outputs.

This is the declaration of the .begin statement.
Code:
void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS );



@floresta: Google is your best friend
3  Using Arduino / Displays / Re: Arduino UNO R3 + PCF8574P + HD44780 on: October 05, 2012, 07:19:24 am
I discovered there are two different libraries available for the I2C LCD with a PCF8574.

The first is the one Mario H. uses as well and looks like this:


The second is used by DFRobot and other suppliers:


The lower and higher nibble are swapped on the display pins...
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