8、树莓派5 LED项目与I²C LCD使用指南

树莓派5 LED项目与I²C LCD使用指南

1. 树莓派5 LED项目

1.1 基础代码与功能

首先，我们来看一段基础代码，它实现了LED端口的配置和二进制计数显示功能。

from time import sleep
PORT = [9,10,22,27,17,4,3,2]

# This function initializes the port list PORT[]
def Configure():
    for i in range(8):
        PORT[i] = LED(PORT[i])

# This function sends 8-bit data (0 to 255) to the PORT
def Port_Output(x):
    b = bin(x)
    b = b.replace("0b", "")
    diff = 8 - len(b)
    for i in range (0, diff):
        b = "0" + b
    for i in range (0, 8):
        if b[i] == "1":
            PORT[i].on()
        else:
            PORT[i].off()
    return

# Main program loop. Count up in binary every second
cnt = 0
Configure()
while True:
    Port_Output(cnt)
    sleep(1)
    cnt = cnt + 1