### lab5-1 ###

from machine import Pin
import utime, urandom

r = Pin(14, Pin.OUT)
g = Pin(12, Pin.OUT)
b = Pin(13, Pin.OUT)

while True:
    
    r.value(urandom.getrandbits(1))
    g.value(urandom.getrandbits(1))
    b.value(1 if r.value() == 0 and g.value() == 0 else urandom.getrandbits(1))
    
    utime.sleep_ms(500)



### lab5-2 ###

from machine import Pin, PWM
import utime, urandom

while True:
    
    #隨機指定每個燈號是否要亮起
    r_switch = urandom.getrandbits(1)
    g_switch = urandom.getrandbits(1)
    b_switch = 1 if r_switch == 0 and g_switch == 0 else urandom.getrandbits(1)
    
    #指定的燈號要亮起時再建立該 PWM 物件
    if r_switch == 1:
        r = PWM(Pin(14, Pin.OUT), freq=1000, duty=0)
    if g_switch == 1:
        g = PWM(Pin(12, Pin.OUT), freq=1000, duty=0)
    if b_switch == 1:
        b = PWM(Pin(13, Pin.OUT), freq=1000, duty=0)

    for i in range(1024):
        if r_switch == 1:
            r.duty(i)
        if g_switch == 1:
            g.duty(i)
        if b_switch == 1:
            b.duty(i)
        utime.sleep_ms(1)
    
    for i in reversed(range(1024)):
        if r_switch == 1:
            r.duty(i)
        if g_switch == 1:
            g.duty(i)
        if b_switch == 1:
            b.duty(i)
        utime.sleep_ms(1)

    #每次燈滅掉後都關閉所有的 PWM 物件
    if r_switch == 1:
        r.deinit()
    if g_switch == 1:
        g.deinit()
    if b_switch == 1:
        b.deinit()



### lab5-3 ###

from machine import Pin, I2C, PWM
from hcsr04 import HCSR04
import bh1750fvi, utime

sonar = HCSR04(trigger_pin=0, echo_pin=16)

r = PWM(Pin(14, Pin.OUT), freq=1000, duty=0)
g = PWM(Pin(12, Pin.OUT), freq=1000, duty=0)
b = PWM(Pin(13, Pin.OUT), freq=1000, duty=0)

while True:
    
    distance = sonar.distance_cm()
    light_level = bh1750fvi.sample(I2C(scl=Pin(5), sda=Pin(4)), mode=0x23)
    
    if 2 <= distance <= 30:
        led_light_value = 1023
        
    else:
        if light_level > 256:
            light_level = 256
        led_light_value = (256 - light_level) * 4 - 1
    
    r.duty(led_light_value)
    g.duty(led_light_value)
    b.duty(led_light_value)
        
    utime.sleep_ms(50)