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

#define PCA9685_ADDRESS  0x40  

Adafruit_PWMServoDriver pwm = Adafruit_PWMServoDriver(PCA9685_ADDRESS);

void setup() {
  Serial.begin(115200);
  
  pwm.begin(); 
  pwm.setPWMFreq(1000); 
  
  Serial.println("PCA9685 initialization complete");
}

void loop() {
  Serial.println("turning off");
  pwm.setPWM(0, 0, 4096);  
  delay(500);            

  Serial.println("turning on");
  pwm.setPWM(0, 0, 0);     
  delay(500);            
}