from machine import Pin,PWM
import time

#流水灯
# leds=[  Pin(2,Pin.OUT),
#         Pin(3,Pin.OUT),
#         Pin(4,Pin.OUT)]

# while True:
#     for led in leds:
#         led.on()
#         time.sleep(0.2)
#         led.off()

#呼吸灯
# pwm = PWM(Pin(2))
# pwm.freq(10)          # 1 kHz，远超人眼临界频率 50 Hz

# while True:
    # # 渐亮：0 → 65535
    # for duty in range(0, 65536, 512):
    #     pwm.duty_u16(duty)
    #     time.sleep_ms(8)
    # # 渐暗：65535 → 0
    # for duty in range(65535, -1, -512):
    #     pwm.duty_u16(duty)
    #     time.sleep_ms(8)

    # import math
    # # 把线性的 0-1 范围映射到感知均匀的亮度
    # for i in range(256):
    #     linear = i / 255
    #     gamma_corrected = linear ** 2.2
    #     duty = int(gamma_corrected * 65535)
    #     pwm.duty_u16(duty)
    #     time.sleep_ms(8)


#按键控制
led=Pin(2,Pin.OUT)

btn=Pin(11,Pin.IN,Pin.PULL_UP)

while True:
    if btn.value()==0:
        led.on()
    else:
        led.off()
    time.sleep_ms(20)

#中断
from machine import Pin
import time

led = Pin(2, Pin.OUT)
btn = Pin(14, Pin.IN, Pin.PULL_UP)
last_press_ms = 0

def on_button_press(pin):
    global last_press_ms
    now = time.ticks_ms()
    # 消抖：两次触发间隔 < 200 ms 则忽略
    if time.ticks_diff(now, last_press_ms) > 200:
        led.toggle()          # 切换 LED 状态
        last_press_ms = now

# IRQ_FALLING = 检测下降沿（从高变低 = 按下瞬间）
btn.irq(trigger=Pin.IRQ_FALLING, handler=on_button_press)

# 主循环现在空闲了，可以做其他事
while True:
    print("主循环运行中，等待按钮...")
    time.sleep(1)