from machine import Pin, Timer
import time

# Define pins
led_Red = Pin(13, Pin.OUT)
led_Yellow = Pin(14, Pin.OUT)
led_Green = Pin(15, Pin.OUT)
button = Pin(27, Pin.IN, Pin.PULL_DOWN)
buzzer = Pin(16, Pin.OUT)

# Create a Timer to make a beep sound on the buzzer.
beepTimer = Timer()

# Create a function to beep the buzzer once.
def beep(beepTimer):
    buzzer.value(1)
    time.sleep(0.1)
    buzzer.value(0)

# Set everything at the start

led_Green.value(1)
led_Yellow.value(0)
led_Red.value(0)

# Beep every 4 seconds
beepTimer.init(freq=0.25, mode=Timer.PERIODIC, callback=beep)


# Loop indefinitely
while True:
    
    # Check if the button has been pressed.
    if button.value():

      # Turn off the Green light. Turn on the Yellow light.
      led_Green.value(0)
      led_Yellow.value(1)

      # Pause for 10 seconds
      time.sleep(10)
      
      # Turn off the Yellow light. Turn on the Red light.
      led_Yellow.value(0)
      led_Red.value(1)

      # Beep 4 times per second
      beepTimer.init(freq=4, mode=Timer.PERIODIC, callback=beep)

      # Pause for 20 seconds
      time.sleep(20)

      # Turn off the Red light. Turn on the Green light.
      led_Red.value(0)
      led_Green.value(1)

      # Beep every 4 seconds
      beepTimer.init(freq=0.25, mode=Timer.PERIODIC, callback=beep)