05 Examples
In the sw section you will find some examples. They will allow you to discover the functionalities of the device and explore its capabilities.
Understand how to address and program the RGB LEDs. For changing the value just modify the array ledPad, where the first index is the LEd (from 0 to 15) and the second if the color (0 for red, 1 for green, 2 for blue). This example will light up the first LED (index 0) with a green color. Note that each color intensity goes from 0 to 255.
ledPad[0][0] = 0; //0 corresponds to the intensity of red color
ledPad[0][1] = 255; //1 corresponds to the intensity of green color
ledPad[0][2] = 0; //2 corresponds to the intensity of blue color
Create a simple animation using the delay() function. Also understand how a for structure works. The most important part of the code is this section:
for (int i = 0; i < 16; i++) {
ledPad[i][0] = 0;
ledPad[i][1] = 255;
ledPad[i][2] = 0;
delay(500);
updateLEDs();
}
This code will light up in green colors all the LEDs, from fist 0 to last 15.
Understand the function digitalRead and if-elsestructure. Note that will pinMode(SW_0_PIN, INPUT) a pin is set as input and with uint8_t switch0 = digitalRead(SW_0_PIN) the state is read. And with an if-else you can control wether to enter in a code section or not.
if (switch0 == 1 ){
Serial.println("Button 0 is pushed");
}
In this exercise we will start to use the MIDI protocol to send some simple messages. The most important part is:
noteOn(0, 48, 127);
MidiUSB.flush();
delay(500);
Where the fist value 0 mean the MIDI channel, the second means the note and the third the intensity. Note that 48 corresponds to a C2. If you have in your computer a DAW or a program that receives MIDI you will be able to get the noteOn message.
This last exercise is quite similar to this code. You can run in your computer a program like Logic or Ableton to start playing some music. Feel free to modify the following section.
// RGB LED color Definition //
#define OFF_R 50 // OFF PAD Color Red [0:255] //
#define OFF_G 50 // OFF PAD Color Green [0:255] //
#define OFF_B 50 // OFF PAD Color Blue [0:255] //
//
#define ON_R 0 // ON PAD Color Red [0:255] //
#define ON_G 0 // ON PAD Color Green [0:255] //
#define ON_B 255 // ON PAD Color Blue [0:255] //
//
// MIDI notes definition //
uint8_t notes[4][4] = { //
{32,33,34,35}, //
{36,37,38,39}, //
{40,41,42,43}, //
{44,45,46,47}, //
}; //
uint8_t velocity[4][4] = { //
{127,127,127,127}, //
{127,127,127,127}, //
{127,127,127,127}, //
{127,127,127,127}, //
}; //
// ---------------------------------------------------------------------//
In this section you can set the colors that the LEDs will have when you are not pushing them. Use the variables OFF_R, OFF_G, OFF_B for that. Only values from 0 to 255 are allowed.
You can also configure the color that each button will have when you push them. Configure it in ON_R, ON_G, ON_B.
In notes and velocityyou can also configure each note and each velocity for each PAD.