from machine import ADC, Pin, PWM
import time

# ---------- Street Light ----------
ldr = ADC(26)               # LDR on ADC0 (GP26)
street_led = PWM(Pin(15))   # Streetlight LED
street_led.freq(1000)

THRESHOLD = 30000
brightness = 0

# ---------- Traffic Lights ----------
red = Pin(2, Pin.OUT)
yellow = Pin(3, Pin.OUT)
green = Pin(4, Pin.OUT)

def traffic_cycle():
    red.on()
    yellow.off()
    green.off()
    time.sleep(5)

    red.off()
    yellow.on()
    time.sleep(2)

    yellow.off()
    green.on()
    time.sleep(5)

    green.off()

# ---------- Main Loop ----------
while True:
    # ---- Street Light Control ----
    ldr_value = ldr.read_u16()
    print("LDR:", ldr_value)

    if ldr_value < THRESHOLD:
        if brightness < 65535:
            brightness += 1200
            street_led.duty_u16(brightness)
    else:
        if brightness > 0:
            brightness -= 1200
            street_led.duty_u16(brightness)

    # ---- Traffic Signal ----
    traffic_cycle()