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Topic: can't complie CustomCharacter example sketch- totally unedited? (Read 1 time) previous topic - next topic

dtokez

Mar 07, 2012, 12:44 am Last Edit: Mar 07, 2012, 02:10 am by dtokez Reason: 1
hi all, I am trying to create some custom characters, I could not get it to work in my code so to try and go back to square one I am trying out the built in example CustomCharacter but won't compile and comes up with the same error I used to get? Is there something wrong with my version of the arduino software or something?

Code..
Code: [Select]
/*
 LiquidCrystal Library - Custom Characters

Demonstrates how to add custom characters on an LCD  display.  
The LiquidCrystal library works with all LCD displays that are
compatible with the  Hitachi HD44780 driver. There are many of
them out there, and you can usually tell them by the 16-pin interface.

This sketch prints "I <heart> Arduino!" and a little dancing man
to the LCD.

 The circuit:
* LCD RS pin to digital pin 12
* LCD Enable pin to digital pin 11
* LCD D4 pin to digital pin 5
* LCD D5 pin to digital pin 4
* LCD D6 pin to digital pin 3
* LCD D7 pin to digital pin 2
* LCD R/W pin to ground
* 10K potentiometer:
* ends to +5V and ground
* wiper to LCD VO pin (pin 3)
* 10K poterntiometer on pin A0

created21 Mar 2011
by Tom Igoe
Based on Adafruit's example at
https://github.com/adafruit/SPI_VFD/blob/master/examples/createChar/createChar.pde

This example code is in the public domain.
http://www.arduino.cc/en/Tutorial/LiquidCrystal

Also useful:
http://icontexto.com/charactercreator/

*/

// include the library code:
#include <LiquidCrystal.h>

// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

// make some custom characters:
byte heart[8] = {
 0b00000,
 0b01010,
 0b11111,
 0b11111,
 0b11111,
 0b01110,
 0b00100,
 0b00000
};

byte smiley[8] = {
 0b00000,
 0b00000,
 0b01010,
 0b00000,
 0b00000,
 0b10001,
 0b01110,
 0b00000
};

byte frownie[8] = {
 0b00000,
 0b00000,
 0b01010,
 0b00000,
 0b00000,
 0b00000,
 0b01110,
 0b10001
};

byte armsDown[8] = {
 0b00100,
 0b01010,
 0b00100,
 0b00100,
 0b01110,
 0b10101,
 0b00100,
 0b01010
};

byte armsUp[8] = {
 0b00100,
 0b01010,
 0b00100,
 0b10101,
 0b01110,
 0b00100,
 0b00100,
 0b01010
};
void setup() {
 // create a new character
 lcd.createChar(0, heart);
 // create a new character
 lcd.createChar(1, smiley);
 // create a new character
 lcd.createChar(2, frownie);
 // create a new character
 lcd.createChar(3, armsDown);  
 // create a new character
 lcd.createChar(4, armsUp);  

 // set up the lcd's number of columns and rows:
 lcd.begin(16, 2);
 // Print a message to the lcd.
 lcd.print("I ");
 lcd.write(0);
 lcd.print(" Arduino! ");
 lcd.write(1);

}

void loop() {
 // read the potentiometer on A0:
 int sensorReading = analogRead(A0);
 // map the result to 200 - 1000:
 int delayTime = map(sensorReading, 0, 1023, 200, 1000);
 // set the cursor to the bottom row, 5th position:
 lcd.setCursor(4, 1);
 // draw the little man, arms down:
 lcd.write(3);
 delay(delayTime);
 lcd.setCursor(4, 1);
 // draw him arms up:
 lcd.write(4);
 delay(delayTime);
}



errors...
Quote

CustomCharacter.cpp: In function 'void setup()':
CustomCharacter:114: error: call of overloaded 'write(int)' is ambiguous
K:\Arduino\arduino-1.0\libraries\LiquidCrystal/LiquidCrystal.h:82: note: candidates are: virtual size_t LiquidCrystal::write(uint8_t)
K:\Arduino\arduino-1.0\hardware\arduino\cores\arduino/Print.h:49: note:                 size_t Print::write(const char*)

el_supremo

I haven't used the lcd library and I don't know what the code is trying to do but try changing each occurrence of this kind of statement:
Code: [Select]
lcd.write(0);

to this:
Code: [Select]
lcd.write('0');

Pete

dtokez

Hi, that complies but just displays the actual number instead of the char i.e lcd.write('3'); just writes the number 3?

Maybe there is a problem with the example sketch?

el_supremo

AHA. Now I understand. The way around it is to use, for example,
Code: [Select]
lcd.write((uint8_t)0);

Pete

dtokez

Thanks I will try that later, surely the example sketch built into the Arduino IDE should work without any modification?

el_supremo

It may be caused by the difference between libraries and examples created for V0.23 or earlier and the V1.0 IDE.

Pete

dtokez

that's great it works fine now :)

is there a way to tell the people in charge that the example sketch needs attention?

andyrobins

Thanks so much for this info guys :)

I have been pulling my hair out trying to fix this same issue.

Works perfectly now.

Cheers

Andy R (AKA G1UUP)

EA3BIL

Hi all,

I just had the same issue with that example...

I fixed by increasin 1 up the assigned numbers for each customized character, that means, leaving 0 unused.
So, first customized character in my case is 1.

Obviously, I had all refences changed to fit the proper character numbers.

Cheers,
Rafa.

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