Comments on: Updated Arduino LCD Library

By: Neil

Neil — Sat, 13 Sep 2008 20:19:59 +0000

Here is an example of what I have to do to get it working properly. If any of the delays are removed, I get jumbled characters after a little while.

#include 
 
Lcd lcd = Lcd(16, FUNCTION_4BIT | FUNCTION_2LINE);
 
char mightybig[]= "Be Awesome!";
 
void setup()
{
  lcd.set_ctrl_pins(CTRLPINS(1,2,3));
  lcd.set_data_pins(_4PINS(4,5,6,7));
 
  lcd.setup();
}
 
void loop()
{
  lcd.home();
  delay(2);
  lcd.print(mightybig);
  delay(300);
  lcd.clear();
  delay(1);
}

By: Neil

Neil — Wed, 10 Sep 2008 14:38:02 +0000

Thanks!

Just so you know, the module that I am using is this one: http://www.nkcelectronics.com/16×2-lcd-module-while-characters-blue-backli162.html

I set the RW pin to 2, and I am using it in 4-bit mode.

By: jiGGaK

jiGGaK — Wed, 10 Sep 2008 13:53:05 +0000

No you don’t need to manually check the busy flag… this should be done automatically.

The fact that it works after adding the 2-3 millisecond delay tells me that the busy flag checking isn’t working correctly. Tonight I’ll try another LCD module I have kicking around to see if I can replicate the problem.

However if you’re feeling adventurous you could have a look at Lcd.cpp file… there is a function there called check_bf() which I suspect is the culprit.

By: Neil

Neil — Wed, 10 Sep 2008 03:17:52 +0000

I have been working with your library, but have been getting some odd results.

First of all, nothing works correctly unless I put delays after every call to the LCD. A 2-3 milli delay is all it takes. (A 1 milli delay doesn’t work.) Do I need to tell it to check the RW pin?