You seem to be using Pin 0 for both the ledpin and drukknop. If the interrupt is on physical pin 7 you probably want drukknop to be 2.
Also note that "attachInterrupt()" is not listed as supported on the page you reference.
You seem to be using Pin 0 for both the ledpin and drukknop. If the interrupt is on physical pin 7 you probably want drukknop to be 2.
Also note that "attachInterrupt()" is not listed as supported on the page you reference.