from machine import Pin
from time import sleep_ms
led = Pin(25, Pin.OUT)
try:
    on_time = int(input("Enter LED ON time (ms): "))
    off_time = int(input("Enter LED OFF time (ms): "))
    print(f"Blinking started: ON={on_time}ms, OFF={off_time}ms")
    while True:
        led.value(1)      
        sleep_ms(on_time) # 
        led.value(0)      
        sleep_ms(off_time)# 
except ValueError:
    print("Error: Please enter only whole numbers (integers).")