Print a string on lcd

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I states that SoftwareSerial is obsolete and to use NewSoftSerial instead.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() {

}

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() {

}

Hello, the code above is correct if you use the old Arduino editor named Alpha.

But with the new one 1.0 the NewSoftSerial is integrated in the core. (do not copie the NewSoftSerial.h into the libraries directory). So the code must be :

#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);  //works fine

}

Just a remark  :

With editor Alpha I used the following code to blank the lcd screen : lcd.print(12,BYTE);

With the new editor this line generates an error code : the BYTE keyword is no longer supported.

So to blank the screen the command is lcd.write(12);