I've never much issue importing a library to my master sketchbook location, restarting Arduino, then using the library examples. Today is a different story:

  1. I'm loading RCLib which is part of this ArduinoLibraries family
  2. RCLib requires PinChangeInt

So everything is in my sketchbook location right? Arduino > Preferences > Sketchbook Location

Still I'm getting compiler errors about missing libraries:

/Users/Jackson/Documents/Arduino/ArduinoLibraries-master/RCLib/Examples/Maga6ChanelsA8_A13/Maga6ChanelsA8_A13.ino:7:86: fatal error: PinChangeInt.h: No such file or directory
 #include "PinChangeInt.h"

I've even tried #include <PinChangeInt.h> Which makes more sense since this is a system library.

What is going on here?

The sketch I'm trying to run:

/**This is an example of using the RCLib with a mega and pinchangeint
 * This example isprovided as is by Jantje
 * Congratualtions, constructive feedback and I like it can be send to [email protected]

#define NUM_RC_CHANNELS 6 //You need to specify how many pins you want to use
#include "PinChangeInt.h"  //If you need pinchangeint you need to include this header
const uint8_t RC_Channel_Pin[NUM_RC_CHANNELS]={
  A8,A9,A10,A11,A12,A13};//Here I specify I want to listen to pins A8 to A13 of my mega

uint16_t RC_Channel_Value[NUM_RC_CHANNELS]; //This variable will contain the values read from the RC signal
#include "RCLib.h" //This include needs all declarations above. Do not try to move it up or it won't compile

Arduino v1.6.9 | OSX 10.11.4

  • 3
    The libraries should be in sketchbook location -> libraries. Try using #include <PinChangeInt.h> (note the less-than / greater-than).
    – Nick Gammon
    Jul 23, 2016 at 3:47

1 Answer 1


I had downloaded PinChangeInterrupt through Arduino

Sketch > Include Library > Manage Libraries... > Filter your search... > PinChangeInterrupt > Install

I thought this is all I needed but I was wrong. This differs from the popular PinChangeInt library. Ultimately the file names where slightly different which is why my file was showing as missing. I found this out by manually looking at the file names in the library I was trying to used and comparing them against my includes.

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