20x4 LCD Display with I2C serial interface

Posted on Tue 1st, April 2014

• #1

Pat
Have one of these, works fine. First time (well once I understood which pins support I2c - another thread on that). But I want to know whether I need to tell Espruino that it's 20x4, and if so how?

This code
```
I2C1.setup({scl:B6, sda:B7});
var lcd = require("HD44780").connectI2C(I2C1);
lcd.clear();
lcd.print("Testing 123 123 123 123 123 123 123");
```
Prints "Testing 123 123 123" on the top row of the display, then there is a blank row, and then I get the final "123 123 123 123" on the third row. As expected ?

Is the a way to specify which row/column I want a piece of text to start ?

Pat
• #2

mikewop

Did you try lcd.setCursor(1,0) to get to the second line?
http://www.espruino.com/HD44780
At a low level, it seems this is based on the LCD controller(s) used in the display. See here: http://forum.arduino.cc/index.php/topic,123864.0.html (Reply #5).
• #3

Gordon

Yes, it's just the way it works. I think setCursor takes account of this - you just have to be careful not to go past the end of the line :)
• #4

Pat

Thanks all. Sorry again, I failed to scroll down far enough at http://espruino.com/HD44780

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