from machine import Pin
from time import sleep

sensor = Pin(19, Pin.IN)      
red = Pin(9, Pin.OUT)          
green = Pin(5, Pin.OUT)        

while True:
    value = sensor.value()     
    if value == 0:
        print("No one is there")
        red.value(1)
        green.value(0)
    else:
        print("Someone is there")
        red.value(0)
        green.value(1)
    sleep(0.5)