# Compiler error with IRremote library and tone() function **URL:** \ **Category:** Programming\ **Created:** [July 6, 2014, 3:55am UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549 "2014-07-06T03:55:25Z")\ **Posts on this page:** 7\ **Page:** 1
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 6, 2014, 3:55am UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549/1 "2014-07-06T03:55:25Z")
I looked up how to control an arduino with an IR remote and I found this library: > **[GitHub - Arduino-IRremote/Arduino-IRremote: Infrared remote library for...](https://github.com/Arduino-IRremote/Arduino-IRremote)** > > Infrared remote library for Arduino: send and receive infrared signals with multiple protocols - GitHub - Arduino-IRremote/Arduino-IRremote: Infrared remote library for Arduino: send and receive in... It works, but when I use this library and the tone() function in the same sketch I get an error. Here is my code: ```plaintext #include [const int sound = 8; const int led = 2; const int sensor = 3; int RECV_PIN = 10; IRrecv irrecv(RECV_PIN); decode_results results; void setup(){  Serial.begin(9600);  pinMode(led, OUTPUT);  pinMode(sensor, INPUT);  pinMode(sound, OUTPUT);  irrecv.enableIRIn(); // Start the receiver } void loop(){  while(digitalRead(sensor) == LOW);  while(true){    delay(500);    tone(sound, 262);    digitalWrite(led, HIGH);    delay(500);    //noTone(snd);    digitalWrite(led, LOW);  } } ``` [ And here is my error: ```plaintext core.a(Tone.cpp.o): In function `__vector_7': C:\Program Files (x86)\Arduino\hardware\arduino\cores\arduino/Tone.cpp:535: multiple definition of `__vector_7' IRremote\IRremote.cpp.o:C:\Users\Albert\Documents\Arduino\libraries\IRremote/IRremote.cpp:337: first defined here ``` When I comment out either the IR library calls or the tone() and noTone() functions, the code compiles fine. I suspect that the tone() function and the IR libraries are conflicting, but I'm not sure. Any thoughts? Thanks in advance! ---
**Author:** ![rogerClark](https://avatars.discourse-cdn.com/v4/letter/r/9fc29f/32.png) [@rogerClark](https://forum.arduino.cc/u/rogerClark)\ **Post date:** [July 6, 2014, 7:39am UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549/2 "2014-07-06T07:39:55Z")
See [http://letsmakerobots.com/content/solved-strange-compilation-error](http://letsmakerobots.com/content/solved-strange-compilation-error) Its because both libraries use timer 2 (interrupts) ---
**Author:** ![AnalysIR](https://avatars.discourse-cdn.com/v4/letter/a/848f3c/32.png) [@AnalysIR](https://forum.arduino.cc/u/AnalysIR)\ **Post date:** [July 6, 2014, 1:57pm UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549/3 "2014-07-06T13:57:55Z")
The latest version of the IRLib library has an option which does not use timers. (bitbang mode) \*& allows sending from any pin. In this mode it is blocking while sending, but does free up the various timers. The Author says it is experimental at this stage. If I remember correctly, it may also allow choice of timer to use(?) ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 6, 2014, 7:33pm UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549/4 "2014-07-06T19:33:29Z")
Thank you everyone! My sketches are now running smoothly! 🙂 ---
**Author:** ![AnalysIR](https://avatars.discourse-cdn.com/v4/letter/a/848f3c/32.png) [@AnalysIR](https://forum.arduino.cc/u/AnalysIR)\ **Post date:** [July 6, 2014, 8:27pm UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549/5 "2014-07-06T20:27:47Z")
It might be agood idea to share what you did to fix it, so that others can benefit/learn! ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [July 6, 2014, 10:30pm UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549/6 "2014-07-06T22:30:42Z")
Here is the modified code in the IRremoteInt.h file: (Lines 25-68) ```plaintext // define which timer to use // // Uncomment the timer you wish to use on your board.  If you // are using another library which uses timer2, you have options // to switch IRremote to use a different timer. // Arduino Mega #if defined( __AVR_ATmega1280__ ) || defined( __AVR_ATmega2560__ )  //#define IR_USE_TIMER1   // tx = pin 11  #define IR_USE_TIMER2     // tx = pin 9  //#define IR_USE_TIMER3   // tx = pin 5  //#define IR_USE_TIMER4   // tx = pin 6  //#define IR_USE_TIMER5   // tx = pin 46 // Teensy 1.0 #elif defined( __AVR_AT90USB162__ )  #define IR_USE_TIMER1     // tx = pin 17 // Teensy 2.0 #elif defined( __AVR_ATmega32U4__ )  //#define IR_USE_TIMER1   // tx = pin 14  //#define IR_USE_TIMER3   // tx = pin 9  #define IR_USE_TIMER4_HS  // tx = pin 10 // Teensy++ 1.0 & 2.0 #elif defined( __AVR_AT90USB646__ ) || defined( __AVR_AT90USB1286__ )  //#define IR_USE_TIMER1   // tx = pin 25  #define IR_USE_TIMER2     // tx = pin 1  //#define IR_USE_TIMER3   // tx = pin 16 // Sanguino #elif defined( __AVR_ATmega644P__ ) || defined( __AVR_ATmega644__ )  //#define IR_USE_TIMER1   // tx = pin 13  #define IR_USE_TIMER2     // tx = pin 14 // Atmega8 #elif defined( __AVR_ATmega8P__ ) || defined( __AVR_ATmega8__ )  #define IR_USE_TIMER1   // tx = pin 9 // Arduino Duemilanove, Diecimila, LilyPad, Mini, Fio, etc #else  #define IR_USE_TIMER1   // tx = pin 9   uncomment out this line  //#define IR_USE_TIMER2     // tx = pin 3   comment out this line #endif ``` Note that if the servo library is also used in your sketch, the IRlibrary will interfere with it. See here for more information on arduino timers: [http://letsmakerobots.com/content/arduino-101-timers-and-interrupts](http://letsmakerobots.com/content/arduino-101-timers-and-interrupts) ---
**Author:** ![system](https://dub1.discourse-cdn.com/arduino/user_avatar/forum.arduino.cc/system/32/1140315_2.png) [@system](https://forum.arduino.cc/u/system)\ **Post date:** [May 5, 2021, 8:45pm UTC](https://forum.arduino.cc/t/compiler-error-with-irremote-library-and-tone-function/244549/7 "2021-05-05T20:45:52Z")