from machine import Pin, PWM
import time

# Setup Pins
red = Pin(0, Pin.OUT)
yellow = Pin(1, Pin.OUT)
green = Pin(2, Pin.OUT)
button = Pin(20, Pin.IN, Pin.PULL_UP)
buzzer = PWM(Pin(18))

def signal_pedestrian():
    buzzer.freq(1000)
    buzzer.duty_u16(30000) # Beep!
    time.sleep(0.5)
    buzzer.duty_u16(0)     # Silence

# Simple test loop
while True:
    if not button.value(): # If button is pressed
        signal_pedestrian()
        red.value(1)
        time.sleep(2)
        red.value(0)