Original 8bit LCD example problems

Forum 2005-2010 (read only) Software Interfacing
1

Hello Arduinians

I,m trying to run the sample code from Read Heather's original tutorial for interfacing LCD displays from the playground.
And it will not compile.

What i have done:

Downloadet the zip file
Made the C:\Arduino\hardware\libraries\Lcd directory
Placed LiquidCrystal.h, LiquidCrystal.cpp and keywords.txt in above folder
Opened the cursor_calibration.pde sample
Made sure the #include <LiquidCrystal.h> is in the code

When i compile the sketch i get a whole bunch of errors:

LiquidCrystal.cpp:8: error: declaration of C function 'void pinMode(int, int)' conflicts with
C:\Arduino\hardware\cores\arduino/wiring.h:74: error: previous declaration 'void pinMode(uint8_t, uint8_t)' here
LiquidCrystal.cpp:9: error: declaration of C function 'void digitalWrite(int, int)' conflicts with
C:\Arduino\hardware\cores\arduino/wiring.h:75: error: previous declaration 'void digitalWrite(uint8_t, uint8_t)' here
LiquidCrystal.cpp:10: error: declaration of C function 'int digitalRead(int)' conflicts with
C:\Arduino\hardware\cores\arduino/wiring.h:76: error: previous declaration 'int digitalRead(uint8_t)' here
o: In function __static_initialization_and_destruction_0': undefined reference to LiquidCrystal::LiquidCrystal()'o: In function loop': o: In function setup':

I'm using the new 0010 Arduino software on Windows XP

What is it that i have forgotten to do ?

Thanks

MikMo

2

I thought it was mentioned on the forum before but I couldn't find it. My best guess is that you have to change the int's in void pinMode(int, int) to uint8_t.

3

Yes that was it. changed it to uint8_t in 4 places and now it compiles.

Thanks

4

Hi,

Followed both the 8bit interfacing examples, but all I get on my 2x16 LCD is one line of 8 solid chars.

Any ideas please ?

Thanks

Stuart

5

My display is a rather old 16 char. one line type. I ended up using the 4 bit lib. and had to initialize it to 2 line mode so it works as 2 lines of 8 chars, but really on one line.

Try the 4 bit lib. and be very carefull that you hook up everything correct. one thing that is frequently ommited from the datasheets is the fact that you need to put a current limiting resistor on the pin for the backlight. I didn't and it got very hot before i realized it was required.