Can't use attachInterrupt in a library

Question

I\'m writing a simple library for an ultrasonic distance sensor and thought i\'d try using interrupts.

However i can\'t set my functions in the attachCallback<

Answer 1

So the compiler (not the IDE) tells you exactly what's wrong:

argument of type 'void (HCSR04Interrupt::)()' does not match 'void (*)()

So, while attachInterrupt() takes a function pointer of type void (*)(), you're trying to pass it a non-static member function, which you can't. You can try making the member function static and casting:

static void echoHigh();

// ...

attachInterrupt(_echo_pin - 2, reinterpret_cast(&echoHigh), RISING);