import time
time.sleep(0.1) # Wait for USB to become ready
from machine import Pin,PWM
led=PWM(Pin(2),freq=2000, duty_u16=0)
print("Hello, Pi Pico!")

while 1:
    value=input("key in value:")
    print("value is",value)
    if value=="on 100":
        led.duty_u16(65535)
    elif value=="on 50":
        led.duty_u16(int(50/100*65535))
    elif value=="off":
        led.duty_u16(0)