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

Adafruit_PWMServoDriver driver = Adafruit_PWMServoDriver(0x40);

const int PWM_MAX_COUNT = 4095;
int getOn(double duty) {
    return duty * PWM_MAX_COUNT;
}
int getOff(double duty) {
    // Give this a shot?
}

void setup() {
    driver.begin();
    driver.setPWMFreq(1600);
}

void loop() {
    driver.setPWM(0, 0, 1024);
    // driver.setPWM(0, getOn(.25), getOff(.25));
    delay(1);
    driver.setPWM(0, 0, 3075);
    // driver.setPWM(0, getOn(.25), getOff(.25));
    delay(1);
}