#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++) {
    setLED(pin, 255);  
    delay(100);
    setLED(pin, 0);    
    delay(100);
  }
}

void setLED(uint8_t pin, uint8_t brightness) {
  // Ensure brightness is in range 0-255
  if (brightness > 255) brightness = 255;
  
  // Map brightness (0-255) to PWM range (0-4095)
  uint16_t pwmValue = map(brightness, 0, 255, 0, 4095);

  pwm.setPWM(pin, 0, pwmValue);
}