物联网开发笔记(6)- 使用Wokwi仿真树莓派Pico实现按键操作
这篇文章和大家一起来看下按键相关的操作。
一、目的
使用按键来控制LED不同的闪烁速度
项目分享连接(方法一):
Wokwi Arduino and ESP32 Simulatorhttps://wokwi.com/projects/341563215336964690项目分享连接(方法二):
Wokwi Arduino and ESP32 Simulatorhttps://wokwi.com/projects/341563215336964690
二、硬件连接方法
方法一:
LED连接GPIO的端口0,按键连接GPIO的端口1。按键通过一个上拉电阻接到3.3V电源上,当按键不按下时是高信号,按键按下时GPIO端口1导通,变为低信号。
方法二:
去电上拉电阻,使用GPIO的PULL_UP功能。
三、代码分析
方法一:
mian.py
# 这个例子是实现按键操作
from machine import Pin
import utime
LED = Pin(0, Pin.OUT) # 紫色LED,端口0
KEY = Pin(1, Pin.IN) # 按键,端口1,配置成IN模式
while True:
if KEY.value()== 0: # 按键按下
#LED每秒闪烁一次
LED.value(1) # LED亮
utime.sleep(1)
LED.value(0) # LED灭
utime.sleep(1)
else:
#LED每0.2秒闪烁一次
LED.value(1) # LED亮
utime.sleep(0.2)
LED.value(0) # LED灭
utime.sleep(0.2)
# 按键使用小技巧:按住Ctrl键然后按下按键后不会弹起。
diagram.json
{
"version": 1,
"author": "Anonymous maker",
"editor": "wokwi",
"parts": [
{
"type": "wokwi-pi-pico",
"id": "pico",
"top": -84.04,
"left": -21.65,
"attrs": { "env": "micropython-20220117-v1.18" }
},
{
"type": "wokwi-resistor",
"id": "r1",
"top": -150.16,
"left": 11.36,
"rotate": 180,
"attrs": { "value": "470" }
},
{
"type": "wokwi-led",
"id": "led2",
"top": -160.43,
"left": -47.75,
"attrs": { "color": "blue" }
},
{
"type": "wokwi-resistor",
"id": "r2",
"top": -139.09,
"left": 120.03,
"rotate": 90,
"attrs": { "value": "470" }
},
{
"type": "wokwi-pushbutton",
"id": "btn1",
"top": -63.85,
"left": -188.55,
"attrs": { "color": "green", "key": "1" }
}
],
"connections": [
[ "led2:A", "pico:GP0", "green", [ "v0" ] ],
[ "led2:C", "r1:2", "green", [ "v12.49", "h-27.74", "v-75.2", "h106.23" ] ],
[ "r1:1", "pico:GND.8", "green", [ "v0" ] ],
[ "btn1:1.r", "pico:GP1", "green", [ "v0" ] ],
[ "btn1:1.r", "r2:1", "green", [ "v-138.22", "h33.03" ] ],
[ "r2:2", "pico:3V3", "green", [ "h1.94", "v65.96" ] ],
[ "btn1:2.r", "pico:GND.4", "green", [ "h0.8", "v99.76" ] ]
]
}
方法二:
mian.py
# 这个例子是实现按键操作
from machine import Pin
import utime
LED = Pin(0, Pin.OUT) # 紫色LED,端口0
KEY = Pin(1, Pin.IN, Pin.PULL_UP) # 按键,端口1,配置成IN和PULL_UP
while True:
if KEY.value()== 0: # 按键按下
#LED每秒闪烁一次
LED.value(1) # LED亮
utime.sleep(1)
LED.value(0) # LED灭
utime.sleep(1)
else:
#LED每0.2秒闪烁一次
LED.value(1) # LED亮
utime.sleep(0.2)
LED.value(0) # LED灭
utime.sleep(0.2)
# 按键使用小技巧:按住Ctrl键然后按下按键后不会弹起。
diagram.json
{
"version": 1,
"author": "Anonymous maker",
"editor": "wokwi",
"parts": [
{
"type": "wokwi-pi-pico",
"id": "pico",
"top": -84.04,
"left": -21.65,
"attrs": { "env": "micropython-20220117-v1.18" }
},
{
"type": "wokwi-resistor",
"id": "r1",
"top": -150.16,
"left": 11.36,
"rotate": 180,
"attrs": { "value": "470" }
},
{
"type": "wokwi-led",
"id": "led2",
"top": -160.43,
"left": -47.75,
"attrs": { "color": "blue" }
},
{
"type": "wokwi-pushbutton",
"id": "btn1",
"top": -63.85,
"left": -188.55,
"attrs": { "color": "green", "key": "1","label": "Btn1", "bounce": "0" }
}
],
"connections": [
[ "led2:A", "pico:GP0", "green", [ "v0" ] ],
[ "led2:C", "r1:2", "green", [ "v12.49", "h-27.74", "v-75.2", "h106.23" ] ],
[ "r1:1", "pico:GND.8", "green", [ "v0" ] ],
[ "btn1:1.r", "pico:GP1", "green", [ "v0" ] ],
[ "btn1:2.r", "pico:GND.4", "green", [ "h0.8", "v99.76" ] ]
]
}
关于按键的更多知识请查看:
wokwi-pushbutton Reference | Wokwi Docs12mm Tactile Switch Button (momentary push button).https://docs.wokwi.com/parts/wokwi-pushbutton
好了关于树莓派Pico的延时到此结束了,后面我们换个开发板,跟大家继续讲述新的知识,谢谢!