面包板使用教程 All In One

面包板使用教程 All In One

1. 树莓派 3V 针脚供电

Raspberry Pi 3B GPIO

2. 干电池 3V (1.5x2节) 才能带动 LED 发光

(🐞 反爬虫测试！打击盗版⚠️）如果你看到这个信息, 说明这是一篇剽窃的文章，请访问 https://www.cnblogs.com/xgqfrms/ 查看原创文章！

面包板

https://www.yahboom.com/public/download/AR/4.下载专区/面包板使用简介.pdf

http://www.i-element.org/breadboard/

https://learn.sparkfun.com/tutorials/how-to-use-a-breadboard

虚拟面包板

https://fritzing.org/

导通图解

揭开面包板背面的双面胶贴纸 ✅

https://youtu.be/spOVPgAwWNE?t=122

https://www.youtube.com/watch?v=SoGhKNgy7j0

万用表, 导通测试

https://www.youtube.com/watch?v=oWVDOomVKok

demos

https://github.com/xgqfrms/Raspberry-Pi/blob/master/Pico/zh-cn/chapter-06.md

GPIO & LED

Raspberry Pi & LED

$ cat gpio.py
$ vim gpio.py
# 命令行传入参数
$ ./gpio.py 3

gpio.py

#!/usr/bin/env python3
# coding: utf8

import RPi.GPIO as GPIO
from datetime import datetime
import time
import sys

arg1 = sys.argv[1]
print("arg1 =", arg1);

# Python 获取时间戳 ✅
now = datetime.now()
# 转换为指定的格式
currentTime = now.strftime("%Y-%m-%d %H:%M:%S")
print("⏰ current datetime =", currentTime);

# $ pinout 命令查看，或 https://pinout.xyz/
# 指定 BCM 模式下的 GPIO 针脚编号是 12
# 对应的物理针脚编号是 32
PIN = 12
# BCM 模式
GPIO.setmode(GPIO.BCM)

# 指定 GPIO 针脚为一个电流输出针脚
GPIO.setup(PIN, GPIO.OUT)
# 输出低电平
GPIO.output(PIN, GPIO.LOW)

# index
i = 0
# 类型转换，str => int
n = int(arg1)
print("n =", n)
print('开始闪烁⏳')

while (i < n):
    print("i =", i)
    # 高电平，LED 点亮
    GPIO.output(PIN, GPIO.HIGH)
    # 休眠 1 秒，防止 LED 长时间点亮烧坏了
    time.sleep(1.0)
    # 低电平，LED 熄灭
    GPIO.output(PIN, GPIO.LOW)
    # 休眠 1 秒
    time.sleep(1.0)
    i = i + 1

# 输出低电平，LED 关闭
# GPIO.output(PIN, GPIO.LOW)
# 清除，释放内存
GPIO.cleanup()

print('结束闪烁 👌🏻')

crontab

$ crontab -l
# Edit this file to introduce tasks to be run by cron.

# 自动化执行脚本 ✅
# 每隔 3 分钟执行一次
# 分钟 小时 天 月 周
#3 * * * * pi sh ./Desktop/gpio.py
# user python 参数
# 3 * * * *  python ./gpio.py 3
# 绝对路径 python ✅
# 二合一输出 log 🚀

# 每小时的第3 分钟执行一次
# >> 追加 log, > 覆盖 log
*/30 * * * * /usr/bin/python /home/pi/Desktop/gpio.py 3 >> /home/pi/Desktop/gpio.log.txt 2>&1

# Vixie Cron 不支持非标准 cron bug ❌

# 每个小时，从0 开始，每隔 5 分钟执行一次 ✅
# */5 * * * * /usr/bin/python /home/pi/Desktop/five.py >> /home/pi/Desktop/five.log.txt 2>&1
# */10 * * * * /usr/bin/python /home/pi/Desktop/five.py >> /home/pi/Desktop/ten.log.txt 2>&1

# 用户 crontab(⚠️ 没有用户字段 pi )

$  cat gpio.log.txt
arg1 = 3
⏰ current datetime = 2023-04-13 14:00:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 14:30:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 15:00:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 15:30:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 16:00:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 16:30:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 17:00:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 17:30:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻
arg1 = 3
⏰ current datetime = 2023-04-13 18:00:01
n = 3
开始闪烁⏳
i = 0
i = 1
i = 2
结束闪烁 👌🏻

GPIO 针脚图解

https://www.raspberrypi.com/documentation/computers/os.html#gpio-and-the-40-pin-header

refs

https://www.cnblogs.com/xgqfrms/tag/GPIO/

https://github.com/xgqfrms/Raspberry-Pi/tree/master/Pico

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