from machine import Pin
from utime import sleep

RLed = Pin(23 ,Pin.OUT)
GLed = Pin(22 ,Pin.OUT)

Btn = Pin(21 , Pin.IN)

while True:

    if (Btn.value() == 0):
        RLed.on()

    else:
        RLed.off()

        GLed.on()
        sleep(3)
        GLed.off()