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 Pinimport utimepurple_LED = Pin(6, Pin.OUT) # 紫色LED，端口6white_LED = Pin(7, Pin.OUT) # 白色LED，端口7while 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 Pinimport utimepurple_LED = Pin(6, Pin.OUT) # 紫色LED，端口6white_LED = Pin(7, Pin.OUT) # 白色LED，端口7flag = 1while True:if flag == 1:purple_LED.value(1) # 紫色LED亮white_LED.value(0) # 白色LED熄灭flag = 0print("flag: ",flag)else:purple_LED.value(0) # 紫色LED熄灭white_LED.value(1) # 白色LED亮flag = 1print("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-2027-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" ] ]]}
大家学会了没，有问题请留言，或者加微信公众号，或者QQ群和大家多交流。谢谢！
