acquiring libraries

Development Tools IDE 1.x
1

Newby questions here regarding acquiring libraries.
So I have HelloWorld_i2c.ino, a sample program from the Liquid Crystal library.

HelloWorld_i2c.ino has
#include "LiquidCrystal.h"
So I downloaded the complete folder for the file.

But then, the LiquidCrystal.h has:
#include <inttypes.h>
#include "Print.h"

Searching this site and the internet, the only source I could find of Print.h is at Github, but it was just the raw file, "Print.h". I was also able to find "Print.cpp" on another Github page. So I copied the code from both and created "Print.h" and "Print.cpp" files and stuffed them into a "Print" folder.

Is there somewhere I can download a complete folder with those two files plus a "keywords.txt" file and examples?

And then I went to do the same with <inttypes.h>, but I could only find the "inttypes.h" file, I could not find an "inttypes.cpp" file.
Same question.

Thanks, LesB

2

I using a mac, so this is how I find those files

The libraries folder which includes LiquidCrystal is location at

Machintosh SSD ▸ Applications ▸ Arduino ▸ Contents ▸ Resources ▸ Java

The print.h and print.cpp is located at

Machintosh SSD ▸ Applications ▸ Arduino ▸ Contents ▸ Resources ▸ Java ▸ hardware ▸ arduino ▸ cores ▸ arduino

I found 6 different inttypes files, so wasn't sure how to help you on that one
I hope this helps?

3

Thanks, I was able to find a trove of libraries, on a PC inside the "arduino.h" folder. It included "Print.h" and "Print.cpp" .

It didn't include a "inttypes.h" file, but I did find the one at Github. A question here would be, is "inttypes.h" good to go without an accompanying "inttypes.cpp" file?

4

lesizz:
A question here would be, is "inttypes.h" good to go without an accompanying "inttypes.cpp" file?

Yes. In some cases a .h file just defines some constants and doesn't need any executable code.

5

Thanks for the help so far.

Now that I have these libraries installed, I have run into the following problem:

The Liquid_Crystal.h library in turn lists:

#include <inttypes.h>
#include "Print.h"
#include "Adafruit_MCP23008.h"

I have added those three libraries to the library folder. When I compile the sketch that uses "Liquid_Crystal.h" (HelloWorld_i2c.ino ) I get an error message that "Adafruit_MCP23008.h" does not exist. I have double-checked the spelling of the library file and its folder. I can't figure why this library is not recognized, especially since the other two I installed along with it are presumably recognized.

Here's the error message:

Arduino: 1.0.6 (Windows 7), Board: "Arduino Uno"
C:\Program Files (x86)\Arduino\hardware\tools\avr\bin\avr-g++ -c -g -Os -Wall -fno-exceptions -ffunction-sections -fdata-sections -mmcu=atmega328p -DF_CPU=16000000L -MMD -DUSB_VID=null -DUSB_PID=null -DARDUINO=106 -IC:\Program Files (x86)\Arduino\hardware\arduino\cores\arduino -IC:\Program Files (x86)\Arduino\hardware\arduino\variants\standard -ID:\My Cubby\Arduino\libraries\Wire -ID:\My Cubby\Arduino\libraries\LiquidCrystal C:\Users\Les_B\AppData\Local\Temp\build9076396422179337879.tmp\HelloWorld_i2c.cpp -o C:\Users\Les_B\AppData\Local\Temp\build9076396422179337879.tmp\HelloWorld_i2c.cpp.o  
In file included from HelloWorld_i2c.ino:19:
D:\My Cubby\Arduino\libraries\LiquidCrystal/LiquidCrystal.h:6:31: error: Adafruit_MCP23008.h: No such file or directory
In file included from HelloWorld_i2c.ino:19:
D:\My Cubby\Arduino\libraries\LiquidCrystal/LiquidCrystal.h:120: error: 'Adafruit_MCP23008' does not name a type
6

There are many "Liquid Crystal" libraries. You have to use one that supports your LCD hardware. Usually you can find the right library via a pointer in the product description of the product you bought.

What LCD are you using?

7

I'm using this one because it is visible in daylight.
Also helps that it works on 3.3V and works over an I2C interface: