import time
import board
import pwmio

FILAMENT_PWM_PIN = board.D6

filament = pwmio.PWMOut(FILAMENT_PWM_PIN, frequency=5000)

start = 0
end = 65535
delta = end - start
increments = 10

for i in range(increments):
    intensity = int(start + ((i + 1) * delta / increments))
    print("  intensity: ", intensity)
    filament.duty_cycle = intensity
    time.sleep(2)