74HC595 点凉8个灯

74HC595是一种移位寄存器，可以通过串行输入控制并行输出，从而实现控制多个LED的目的。以下是控制8个LED点亮熄灭的代码示例：

import RPi.GPIO as GPIO
import time

# 定义74HC595芯片引脚
DS = 11  # 数据输入
SHCP = 12  # 时钟信号
STCP = 13  # 存储信号

# 初始化GPIO
GPIO.setmode(GPIO.BOARD)
GPIO.setup(DS, GPIO.OUT)
GPIO.setup(SHCP, GPIO.OUT)
GPIO.setup(STCP, GPIO.OUT)

# 定义8个LED的状态
led_status = [0, 0, 0, 0, 0, 0, 0, 0]

# 定义函数，将数据写入74HC595芯片
def write_data(data):
    for i in range(8):
        GPIO.output(DS, data & 0x80)  # 从高位开始写入数据
        GPIO.output(SHCP, GPIO.HIGH)
        GPIO.output(SHCP, GPIO.LOW)
        data <<= 1  # 移位

    GPIO.output(STCP, GPIO.HIGH)  # 存储数据
    GPIO.output(STCP, GPIO.LOW)

# 循环控制LED点亮熄灭
while True:
    for i in range(8):
        led_status[i] = 1  # 点亮第i个LED
        data = 0
        for j in range(8):
            data <<= 1
            data |= led_status[j]
        write_data(data)  # 将数据写入74HC595芯片
        time.sleep(1)  # 等待1秒

    for i in range(8):
        led_status[i] = 0  # 熄灭第i个LED
        data = 0
        for j in range(8):
            data <<= 1
            data |= led_status[j]
        write_data(data)  # 将数据写入74HC595芯片
        time.sleep(1)  # 等待1秒

# 清理GPIO资源
GPIO.cleanup()