#include <Wire.h>
#include <Adafruit_PWMServoDriver.h>
class LEDKey
{
  private:
    Adafruit_PWMServoDriver led;   
  public:
  LEDKey(const byte addr): led{addr} {} //0x40 oder 0x41

  void begin()
  {
    led.begin();
    Wire.setClock(400000);
    led.setPWMFreq(1000);
  }

  void pinOff(int p)  {led.setPWM(p , 0 , 4096);}
  void pinOn(int p)   {led.setPWM(p , 4096 , 0);}
};