物联网开发笔记（5）- 使用Wokwi仿真树莓派Pico实现LED灯交替闪烁（续）

大家好，我们再来研究一下，LED交替闪烁。在前面的文章：笔记（2）我们已经实现了。这次我们换一种实现方法。

一、目的

实现两个LED连接到Pico，LED间隔500ms交互闪烁

二、硬件连接

LED分别连接到树莓派的Pico的GP7和GP8，通过限流电阻470欧姆电阻

三、代码分析

定义两个LED灯，通过两个GPIO控制，这里选择GPIO6和7。也可以选择其他GPIO口。

main.py （方法一的代码，此处通过简单设置LED灯的状态来实现）

# 这个例子是实现定时器
 
from machine import Pin
import utime
 
purple_LED = Pin(6, Pin.OUT)  # 紫色LED，端口6
white_LED = Pin(7, Pin.OUT)  # 白色LED，端口7
 
while True:
  purple_LED.value(1)  # 紫色LED亮
  white_LED.value(0)  # 白色LED熄灭
  utime.sleep(1)
  purple_LED.value(0)  # 紫色LED熄灭
  white_LED.value(1)  # 白色LED亮
  utime.sleep(1)

main.py （方法二的代码，此处通过设置flag的值来切换，设立flag是嵌入式开发常用的方法）

# 这个例子是实现定时器
 
from machine import Pin
import utime
 
purple_LED = Pin(6, Pin.OUT)  # 紫色LED，端口6
white_LED = Pin(7, Pin.OUT)  # 白色LED，端口7
flag = 1
 
while True:
  if flag == 1:
    purple_LED.value(1)  # 紫色LED亮
    white_LED.value(0)  # 白色LED熄灭
    flag = 0
    print("flag: ",flag)
  else:
    purple_LED.value(0)  # 紫色LED熄灭
    white_LED.value(1)  # 白色LED亮
    flag = 1
    print("flag: ",flag)
  utime.sleep(1)

diogram.json（方法一和方法二的电路连接是一样的）

{
  "version": 1,
  "author": "Anonymous maker",
  "editor": "wokwi",
  "parts": [
    {
      "type": "wokwi-pi-pico",
      "id": "pico",
      "top": -52.98,
      "left": -5.98,
      "attrs": { "env": "micropython-20220117-v1.18" }
    },
    {
      "type": "wokwi-led",
      "id": "led1",
      "top": -3.71,
      "left": 117.56,
      "attrs": { "color": "white", "flip": "", "lightColor": "blue" }
    },
    {
      "type": "wokwi-resistor",
      "id": "r1",
      "top": 96.97,
      "left": 91.4,
      "rotate": 180,
      "attrs": { "value": "470" }
    },
    {
      "type": "wokwi-led",
      "id": "led2",
      "top": -12.42,
      "left": -109.82,
      "attrs": { "color": "magenta" }
    },
    {
      "type": "wokwi-resistor",
      "id": "r2",
      "top": 65.01,
      "left": -94.82,
      "attrs": { "value": "1000" }
    }
  ],
  "connections": [
    [ "led1:C", "r1:1", "green", [ "v35.22", "h26.2" ] ],
    [ "r1:2", "pico:GND.6", "green", [ "v0" ] ],
    [ "led1:A", "pico:GP7", "green", [ "v0" ] ],
    [ "led2:A", "pico:GP6", "green", [ "v0" ] ],
    [ "led2:C", "r2:1", "green", [ "v0" ] ],
    [ "r2:2", "pico:GND.3", "green", [ "v0" ] ]
  ]
}

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