# First Input

> Original: [Getting Started — First Input](https://tttapa.github.io/Control-Surface/Doxygen/d5/d7d/md_pages_Getting-Started.html)

A minimal sketch that receives MIDI and drives outputs (LEDs).

## MIDI input elements

Input elements listen for specific MIDI messages and update their state. `NoteLED` drives a GPIO pin high when its note is active:

```cpp pico
NoteLED led {25, {MIDI_Notes::C[4], Channel_1}};
```

An array of LEDs responding to consecutive notes:

```cpp pico
NoteLED leds[] {
    {16, MIDI_Notes::C[4]},
    {17, MIDI_Notes::D[4]},
    {18, MIDI_Notes::E[4]},
    {19, MIDI_Notes::F[4]},
};
```

Value readers store the incoming value without driving hardware:

```cpp pico
CCValue ccVal {{MIDI_CC::Channel_Volume, Channel_1}};
```

Access the current value with `ccVal.getValue()`.

## Complete example

```cpp pico
#include "pico/stdlib.h"
#include "pico/cyw43_arch.h"
#include <cs_midi.h>

using namespace cs;

BluetoothMIDI_Interface midi;

NoteLED led {25, {MIDI_Notes::C[4], Channel_1}};

CCValue volume {{MIDI_CC::Channel_Volume, Channel_1}};

int main() {
    stdio_init_all();
    if (cyw43_arch_init()) return 1;
    Control_Surface.begin();
    while (true) {
        Control_Surface.loop();
        uint8_t v = volume.getValue();
        (void)v;
        sleep_ms(1);
    }
}
```