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edited May 23, 2017 at 9:51

I have 2 .ino files (2 tabs) for one Arduino project/sketch: MySketch1MySketch_File1.ino and MySketch2MySketch_File2.ino.

I declared in MySketch2MySketch_File2 variables and functions which I want to use in MySketch1MySketch_File1, but I get this error massage:

error: 'a' was not declared in this scope

//MySketch1MySketch_File1.ino
void setup(){
Serial.begin(9600);
Serial.println(String(a));
}

void loop(){

}

Second file:

//MySketch2MySketch_File2.ino
int a;

How can I declare variables and functions one time in one .ino file and use it across multiple .ino files?

I have 2 files: MySketch1.ino and MySketch2.ino. I declared in MySketch2 variables and functions which I want to use in MySketch1, but I get this error massage:

error: 'a' was not declared in this scope

//MySketch1.ino
void setup(){
Serial.begin(9600);
Serial.println(String(a));
}

void loop(){

}

Second file:

//MySketch2.ino
int a;

How can I declare variables and functions one time in one .ino file and use it across multiple .ino files?

I have 2 .ino files (2 tabs) for one Arduino project/sketch: MySketch_File1.ino and MySketch_File2.ino.

I declared in MySketch_File2 variables and functions which I want to use in MySketch_File1, but I get this error massage:

error: 'a' was not declared in this scope

//MySketch_File1.ino
void setup(){
Serial.begin(9600);
Serial.println(String(a));
}

void loop(){

}

Second file:

//MySketch_File2.ino
int a;

How can I declare variables and functions one time in one .ino file and use it across multiple .ino files?

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asked May 23, 2017 at 8:26

William Roy

How to use variables and functions across multiple .ino files

I have 2 files: MySketch1.ino and MySketch2.ino. I declared in MySketch2 variables and functions which I want to use in MySketch1, but I get this error massage:

error: 'a' was not declared in this scope

//MySketch1.ino
void setup(){
Serial.begin(9600);
Serial.println(String(a));
}

void loop(){

}

Second file:

//MySketch2.ino
int a;

How can I declare variables and functions one time in one .ino file and use it across multiple .ino files?

programming c++ino