Print a string on lcd

Hi dakota77,

It looks like the issue is with your lowercase "serial.print(ds);", which should read "Serial.print(ds);" - Serial starting with capital S.

I compiled it here, and that's the only thing it complained about. Also, don't forget to include the void loop() function

Hope that helps!

Cheers,

-Nico

Hi Nico,

Thanks for your reply.

Serial.print(ds);  works without problem.

The problem appears when I try to write to the lcd screen : lcd.print(ds)

I don't know why that line would show an error for you, but not for me, as I simply did a cut and paste from what you had in your post.

I'm using the very basic install of the Arduino software, without any added libraries. On a Mac though, which might be different.

Another line I just noticed, that may be causing issues, is the lcd.begin(9600) line - shouldn't that be lcd.begin(16,2) ?

Also, have you already tried running the HelloWorld example? (File - Examples - LiquidCrystal - HelloWorld)

It does the display, but without the serial printouts you have in your code. You could add that as a second step once the first hurdle is cleared.

Cheers,

-Nico

Perhaps have a run through here -  tronixstuff.com/tutorials and click on chapter 24

Hello, thanks for your replies...

In fact all the samples of LCD wiring found on the net, represent a lcd with 6 wires.

My LCD is a Parallax Serial LCD. It has 3 wires : + ground and data

So I simply connect the data wire to a pin.

The disavantage is that I can not use LiquidCrystal.h so but I have to use Softwareserial.h

#include <SoftwareSerial.h>

SoftwareSerial lcd = SoftwareSerial(2, 6); //Set RX/TX pins for LCD

void setup(){

      ds = "test";

      lcd.begin(9600);  //start serial connection

      lcd.print("Hello World"); //works fine

      lcd.print(ds);  //The compiler returns an error

}

So my question is : with this type of display, how can I print a string on the lcd ?

Thanks for your time.

Find a way to add a binary zero to the end of the string.  Your character array ds contains ds[0]='t' , etc.  You might really need to  make ds[4]=0.    The phrase "null terminated string" has real meaning in some apps.

possibly this change would work:    ds = "test\0";

Here is some more useful info.

If you find this helpful; it would be appropriate to "Like" my post.

Hi,

I tried compiling your example and got in Arduino 022:

sketch_jan31a:8: error: no matching function for call to ‘SoftwareSerial::print(String&)’

I found this thread:

http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1289274437

I states that SoftwareSerial is obsolete and to use NewSoftSerial instead.  I was able to compile this ok:

#include <NewSoftSerial.h>

NewSoftSerial lcd = NewSoftSerial(2, 6); //Set RX/TX pins for LCD
String ds;
 
void setup(){
      ds = "test";
      lcd.begin(9600);  //start serial connection
      lcd.print("Hello World"); //works fine
      lcd.print(ds);  //The compiler returns an error
}

void loop() {
  
}

Cheers,

Drew

yes yes yes fantastic ! it works !

thanks a lot for your help.

Mario

That is Great!  Would you mind specifing what change you made?

"it" doesn't quite narrow down the possibilites.

Hello,

I have simply used the NewsoftSerial library instead of SoftwareSerial.h

I can now print a string to lcd without problem.

Thanks gain for your help.

Mario

#include <NewSoftSerial.h>

NewSoftSerial lcd = NewSoftSerial(2, 6); //Set RX/TX pins for LCD

String ds;

void setup(){

      ds = "test";

      lcd.begin(9600);  //start serial connection

      lcd.print("Hello World"); //works fine

      lcd.print(ds);                //works fine

}

void loop() {

}