#exercice1: feu de circulation 
from machine import Pin 
from picozero import sleep 
ledR=pin (1,Pin.out )
ledJ=pin (2,Pin.out )
ledJ=pin(3,Pin.out )
buzzer=speaker(27)
while true :
  ledR.on(); # R on 
  ledJ.off(); # J and V off 
  for i in range (5): # bip buzzer 5 fois 
    buzzer . on ()
    sleep (1)
    buzzer.off()
    sleep(0.5)
  ledR.off (); buzzer .off () # R and buzzer off 
  ledJ.on () # j on 
  sleep (1)  
  led J .off ();led V.on # J off V on  
  sleep (6)
  ledV.off ()
  for i in range (10):
    ledJ.toggle () # led jaune clignote 5 fois 
    sleep (0.2)