pwm_test.py

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BOARD)
GPIO.setup(33, GPIO.OUT)

# Setup 50Hz frequency PWM signal on the pin 33. 
pwm = GPIO.PWM(33, 50)
pwm.start(0)

while True:
    try:
        duty_cycle = input("Set the duty cycle and press enter: ")
        duty_cycle = float(duty_cycle)
        
        print("The DC is:", duty_cycle)
        pwm.ChangeDutyCycle(duty_cycle)
    
    except KeyboardInterrupt:
        break

pwm.stop()
GPIO.cleanup()