pi_pwm

The Raspberry Pi does not have analog ports. So you use Pulse Width Modulation. 

You want a 1.6V signal on a Raspberry Pi 3.3V GPIO.   It would be approximately, 50% duty cycle or 3.3V * 50% = 1.65V.   You can setup an instance like

 

GPIO.setmode(GPIO.BOARD)
GPIO.setup(11, GPIO.OUT)
pi_pwm = GPIO.PWM(11,100)   # 100 Hz = 10 ms
pi_pwm.start(50)    # duty cycle of 50%

pi_pwm.ChangeDutyCycle(100) # duty cycle changed to 100%
pi.pwm.ChangeFrequency(1000) # change frequency to 1000 Hz or 1 ms

pi.pwm.stop() # to stop it
GPIO.cleanup() # to remove the code from the pi or cleanup.

classgpiozero.PWMLED(pin, *, active_high=True, initial_value=0, frequency=100, pin_factory=None)[source]

from gpiozero import PWMLED
from time import sleep

led = PWMLED(24)

while True:
    led.value = 0 # off sleep(1)
    led.value = 0.5 # half brightness
    sleep(1)
    led.value = 1 # full brightness
    sleep(1)