Dear Forum, i dont where im doing wrong. below code works fine in Arduino IDE but unsuccessful in PIO with arduino core Here in what i ve written in Main.cpp #include <Arduino.h> #include "nav_button.h" #define BUTTON_PIN 10 Button button1(BUTTON_PIN); void setup() { Serial.begin(9600); …

[image] mutthunaveen: Yes, correct. both .h and .cpp are in same “lib” folder. along with other .h files i made. You should create a subfolder in lib and put the source files in there, as the README says , not directly into lib/.

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Undefined reference to `function::function(variable)' collect2.exe: error: ld returned 1 exit status

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mutthunaveen April 21, 2021, 10:16am 3

Yes, correct. both .h and .cpp are in same “lib” folder. along with other .h files i made.