#include <Plaquette.h>

// The LED.
DigitalOut led(LED_BUILTIN);

// A square-wave (on/off) oscillator.
SquareWave oscillator(2.0); // 2 seconds period

void begin() {
  // Set duty cycle of wave.
  oscillator.width(0.1); // 0.1 => 10% up, 90% down
}

void step() {
  // Send oscillator value to LED.
  oscillator >> led;
}