"Not declared in this scope" ??

[Aaaxel]

Hello everyone!

I am making a MIDI controller (obviously ^^) for Ableton using this library but it is still my first real Arduino project and I don't understand everything..
In this project, which is supposed to use a LED as a metronome when I press a button, the program is supposed to send a CC, which will then be interpreted in Ableton as a "Play". The error is " "ControlChange" was not declared in this scope" (in the program, 6 lines below "/////METRONOME")
I didn't still completely got how scopes works, and I saw many people have such similar problems with others libraries, but I really don't know what is the error.
I hope you'll help (and you will understand my program, it's maybe a bit messy)
Thanks!

The Program:

`

#include <MIDI.h>

MIDI_CREATE_DEFAULT_INSTANCE();

unsigned long preMillis_metr = 0; // repere horloge

unsigned long preMillis_but = 0;

const int led_metronome = 2;  // On definit les noms des pins

const int led_test = 37;      //

const int boutton = 28;       //

int var = 0;  // pour compter les temps

int mes = 4;  // nb de temps par mesure-DEFINIR AU LANCEMENT

int tempo = 140;    // tempo-DEFINIR AU LANCEMENT

int imp = (60000/tempo)-30 ;   // durée écart impulsions

int but = 0;     // boutton enfoncé?

int actif = 0;   // ON/OFF  actif?

int delbut = 200; //durée de non fonctionnement du bouton après activation
void setup() {

 pinMode(boutton, INPUT_PULLUP);  //BOUTON (branché sur GND et pin28)

 pinMode(led_metronome, OUTPUT);         //LED metronome)

 pinMode(led_test, OUTPUT);        // LED test contact boutton (facultatif)
MIDI.begin();
}
void loop() {

unsigned long actMillis_metr = millis();            //actMillis_metr contient le nb de millis ecoulées depuis le début du prog
 

   /////METRONOME

   if ((actMillis_metr - preMillis_metr >= imp) && (actif==1))     //quand la diff entre dernier pt de passage et le temps actuel est suffisant, alors..

     {

       preMillis_metr = actMillis_metr;              //definir un nouveau pt de passage a la valeur d'horloge actuelle

         if (var==0)                                 // si début de mesure

           {

             MIDI.send(ControlChange,10,127,1);      //HERE WHEN BUTTON IS PRESSED IT IS SUPPOSED TO SEND A CONTROLCHANGE VALUE OF 127 ON CC10, CHANNEL 1

             analogWrite(led_metronome,120);         //forte impulsion

             delay(40);

             analogWrite(led_metronome,0);

             var=var+1;

           }

         else if (var==mes-1)                          //si dernier temps de mesure

           {

             analogWrite(led_metronome,20);

             delay(30);

             analogWrite(led_metronome,0);

             var=0;

           }

         else

           {

             analogWrite(led_metronome,20);          //si temps dans la mesure

             delay(30);

             analogWrite(led_metronome,0);

             var=var+1;

           }

       

     }
/////BOUTTON
but = digitalRead(boutton);      //boutton enfoncé?
if ((but==0)&&(delbut<actMillis_metr - preMillis_but)) //SI boutton enfoncé ET temps passé depuis la derniere detection<500ms, ALORS..

  {

     if (actif==0)                                     //SI inactif ALORS activer

        {

           var=0;                                      //Avant de relancer le métronome, reset les temps aux premiers pour repartir du début de la mesure

           actif = 1;                   

        }

     else                                              //SI actif ALORS desactiver

        {

           actif = 0;                                  

        }

     preMillis_but = actMillis_metr;                   //remmettre a 0 le temps passe depuis activation

  }
if (actif==1)

 {

   digitalWrite(led_test,HIGH);

 }

else

 {

   digitalWrite(led_test,LOW);

 }
}
//END PROG

`

[lathoub]

you are missing the namespace. Use
MIDI.send(MIDI_NAMESPACE::ControlChange,10,127,1);

[Aaaxel]

It works, thanks!!