#include <Wire.h> 
#include <Adafruit_PWMServoDriver.h>

#define PCA9685_ADDRESS  0x40 
Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver(PCA9685_ADDRESS, Wire);

void setup() {
  pwm.begin();  
  pwm.setPWMFreq(1000);  
}

void loop() {

  for (uint8_t pin=0; pin<16; pin++) {
    pwm.setPWM(pin, 4096, 0);       // turns pin fully on
    delay(100);
    pwm.setPWM(pin, 0, 4096);       // turns pin fully off
  }

  // pwm.setPWM(0, 0, 4095);  
  // delay(500); 
  // pwm.setPWM(0, 0, 4095);  
  // delay(500); 
}