Newbie : sending midi message to pitch bend a note - a simple example ?

Using Arduino Audio
1

Hello everyone

I would like to make a very simple king of midi Theremin, with a HC SR04 module to pitch the notes.
But first thing first, i'm starting by sending a simple note from Arduino Uno to my midi software.

I did the simpliest thing possible (official Arduino example) :

It's plugged to a midi/usb interface which is talking to my midi software (ableton live), and i can hear a midi simple note with the code below.
Great !

My next step is to pitch bending this note, and ... i haven't found the working message !
I read lot's of thing about sending midi message, but i haven't found a simple example that working with my arduino uno ...
Help my ears :smiley:

/*
So simple midi
*/

int speed_com = 31250; // the midi speed
int note;

void setup(){  
  Serial.begin(speed_com);     // init serial speed
  playMidi (0x90, 0x5A, 0x45); // play on channel 1, never ending pain of my ears !
}

void loop(){
  delay (2000);

  // NOW, PITCH ME, PLEASE !!!

}

void playMidi (int cmd, int pitch, int velocity) {
  Serial.write(cmd);
  Serial.write(pitch);
  Serial.write(velocity);
}
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2

Pitch Wheel Change. 0mmmmmmm This message is sent to indicate a change in the pitch wheel. The pitch wheel is measured by a fourteen bit value. Center (no pitch change) is 2000H. Sensitivity is a function of the transmitter. (llllll) are the least significant 7 bits. (mmmmmm) are the most significant 7 bits.

Pitch Wheel Change message:

// Value is +/- 8192
void PitchWheelChange(int value) {
    unsigned int change = 0x2000 + value;  //  0x2000 == No Change
    unsigned char low = change & 0x7F;  // Low 7 bits
    unsigned char high = (change >> 7) & 0x7F;  // High 7 bits

   playMidi(0xE0, low, high);
}
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3

Damned !
i'm sorry but i can't integrate your function in my newbie code !
no way to do it :~

thanks anyway :slight_smile:

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4

Okayyyyyyy, i think i have something now.
Hearing the cops coming with a loop :wink:

/*
So simple midi
*/

int speed_com = 31250; // the midi speed
int note;

    
void setup(){  
  Serial.begin(speed_com);     // init serial speed
  playMidi (0x90, 0x5A, 0x45); // play on channel 1, never ending pain of my ears !
}

void loop(){

  // NOW, PITCH ME, PLEASE !!!
  for (int i=2000 ; i < 8000 ; i+=5){
    // you're under arrest, cops are singing !
    PitchWheelChange(i);
  }

}

void playMidi (int cmd, int pitch, int velocity) {
  Serial.write(cmd);
  Serial.write(pitch);
  Serial.write(velocity);
}


// johnwasser was here !
// Value is +/- 8192

void PitchWheelChange(int value) {
    unsigned int change = 0x2000 + value;  //  0x2000 == No Change
    unsigned char low = change & 0x7F;  // Low 7 bits
    unsigned char high = (change >> 7) & 0x7F;  // High 7 bits

   playMidi(0xE0, low, high);
}

I'm not sure where i'm going with that, but i'm learning !
I think i'm gonna try adding a potentiomer to drive your function.
If someone looking for me, i'm in the lab !

Thanks for France :smiley:

1 Like
5

This will let you pitch-bend with a pot connected to A0:

void loop(){
    PitchWheelChange(map(analogRead(A0),0, 1023, -8000, 8000));
}
1 Like
6

what ? Mummy ?! Time to dinner allready ?

oh sorry !
it was you :wink:

I was about to use the map command on my own (yeah i swear !) to constrain the numbers between 0 and 1023...
Your way is much more elegant on a single line.
Great again !
Time to use the Ultrasonic Sensor !!!

Oh Lord, it's allmost ... aliiiiive !!!!
]:slight_smile:

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