from machine import Pin
from utime import sleep
led = Pin(5, Pin.OUT)
for minute in range(3):
for _ in range((minute + 1) * 5 * 2):
led.high()
sleep(0.5)
led.low()
sleep(0.5)
if minute < 2:
sleep(60 - ((minute + 1) * 5 * 2) * 1.0)