, its not always that you will able to fine the library file you want to, use for your project. Or even if you found one, it will not be working!

But through our experience we are telling , its not always that you will able to fine the library file you want to, use for your project. Or even if you found one, it will not be working!

ever library you want at an instance, you can find that, by just using some relevant keyword while using the search engine. But through our experience we are telling , its not always that you will able to fine the library file you want to, use for your project. Or even if you found one, it will not be working!

by its library support! What ever library you want at an instance, you can find that, by just using some relevant keyword while using the search engine. But through our experience we are telling , its not always that you will able to fine the library file you want to, use for your project. Or even if you found one, it will not be working!

As we have seen while using Arduino, it never runs off by its library support! What ever library you want at an instance, you can find that, by just using some relevant keyword while using the search engine. But through our experience we are telling , its not always that you will able to fine the library file you want to, use for your project. Or even if you found one, it will not be working!

So in that case y ou have to write your own library. L ike in our case, we were trying to interface the resistive touch scre n with our Arduino MEGA board, we search e d a lot over the intern e t, & got 2 v ersions of librar y for the same, but they were obsolete, & not working! So decided to write our own library get input from touchscreen to Arduino bo ard .

The same situation can happen with you also! So our recommendation is that you should know "How to write Arduino Library?"

So lets Start......

General Intro

Libraries are files written in either C or C++ (.c, .cpp) which provide your sketch /so urce code with extra or common functionality . They have a file extension of .h.

ATmega8

1st step:

#include<xyz.h> //The custom made library as we want to name it xyz abc; //declaring a xyz class object abc void setup()

{ abc.initial(); //initializing with the option provided in the class definition } void loop()

{ abc.proceed(); //things to at every loop iteration }

So looking at above code, function

2nd step:

// ensure this library description is only included once #ifndef Testing_h #define Testing_h // include types & constants of Wiring core API #include "WConstants.h" //Start of definition of class xyz class xyz { public: //public declared variables & functions, accessible outside of the class //the class constructor xyz(); //Default constructor of class xyz, may contain anything for initializing object void initial(); //define your first function here void proceed();//define your second function here private: //private declared variables & functions, accessible inside the class int input_process(); //to process and draw conclusion from input int callibrationdata(int n=0); //you might want to calibrate your device }; //end of class xyz definition #endif //ending with end if

3rd step:

Save the above code with an extension ".h". It will become your header file.

Next step is to write you own .cpp file, it will contain the main() function,

which is the driver function in a C++ program.

It will look like as...

#include<xyz.h> //including the custom made header file

xyz::xyz()

{ //calling the default constructor } void xyz::initial()

{ //the body of initial() function //setup your sensor here } void xyz::proceed()

{ //the body of the proceed() function int input_data= input_process(); int output=callibrationdata(input_data); } int xyz::input_process()

{ //analogRead or equivalent or whatever you need to do } int ExampleLib::fancyAlgorithm(int inputData)

{ //some complex stuff }

Save it as .cpp extension.

Take both these files...(.cpp & .h) under one folder, and your own custom made library

is ready!

To install it, in your Arduino IDE go to arduino root folder in my case it is

"E:\arduino-1.0.1"

Open Libraries Folder and paste it, now you will be able to use your own custom made

Arduino library by going to "Sketches" then selecting the "Import Library" option,

then selecting the library you hae just created.

HAPPY CODING :)

To use an pre-built/existing library in your Arduino Program simply go to the "Sketch" menu, choose "Import Library", and pick from the libraries available.That will insert anstatement at the top of the sketch/program along with the imported header file. These statements make the public functions and constants defined by the library available to your sketch. They also signal the ArduinoIDE to link that library's code(Linking operation) with your program/code when it is compiled or uploaded.Because libraries are uploaded on board with your sketch/program, they increase the amount of space used by theon the board. If you no longer need a particular library, simply delete itsstatements from the top of your code. This will stop the Arduino IDE from linking the library & decrease the amount of space used on the Arduino board.The basic sketch for the library is writen....Its just like making boundaries before filling up the colors in the canvas! Later from this we will be making the required library.So my code will look like this....initial() is for initializing the variables(ports etc.) and proceed() function for do some operational work at each looping cycle.Now make a list what all going to need, all the input parameters you need, and also output params. also.....Now its time to step up for writing our own Arduino Library for the above needed operation....Arduino may be build up in JAVA, but its programing syntax is very similar to C++.To build the library you are required to create two files, one with extension .h & other .cpp.In the .h(Header file), you need to write as the following....