from machine import UART, Pin, PWM

ledGreen = Pin(4, Pin.OUT)
LedRed = Pin(5, Pin.OUT)
servoctr1 = PWM(Pin(18))
servoctr1.freq(50)

allowed_vals = ['0', '90', '180']

def invalid_angle_handle(angle:int):
    print(f"Invalid angle :{angle}")
    LedRed.on()
    ledGreen.off()

def valid_angle_handle(angle:int):
    print(f"Angle allowed: {angle}")
    if angle == "0":
        servoctr1.duty(25)
    elif angle is "90":
        servoctr1.duty(75)
    else:
        servoctr1.duty(125)
        LedRed.off()
        ledGreen.on()
while True:
    angle = input("Enter angle: ")
    if angle in allowed_vals:
        valid_angle_handle(angle)
    else:
        invalid_angle_handle(angle)