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我们常常听到物联网,但什么是物联网?物联网是说在长的距离间与电子设备以互联网进行通信的新方法。我们可以在有互联网连接的任何地方以网站或移动应用程控各种设备。我们多数听到物联网应用在智能家居、办公室、仓库管理,甚至工厂。哪我们可以自行在家中制作简单的物联网应用吗?
这篇文章将会讲解如何在家中制作简单的物联网应用。首先,我们需要以下的材料:
树莓派2B+/3 |
x1 |
LED |
x1 |
Micro USB线 |
x1 |
杜邦线 |
x2 |
220欧电阻 |
x1 |
Micro SD卡(8GB 以上) |
x1 |
显示器、键盘、鼠标、网络线 |
@1 |
HDMI转换器或HDMI线 |
x1 |
步骤:
从树莓派网站( https://www.raspberrypi.org/downloads/ )下载RASPBIAN。
把LED、电阻和杜邦线如下图连接:
把杜邦线1、2连接到树莓派的7和9 pin
档案下载完成后,把它解压并完整复制到Micro SD卡中,再把Micro SD卡插到树莓派的卡槽中。
把键盘、鼠标、网络线、显示器(透过HDMI转换器或HDMI线)连接到树莓派。
把Micro USB线接上5V电源及树莓派
选择安装RASPBIAN
打开Terminal 并参考以下网页安装Mosquitto,请紧记”$ sudo mosquitto_passwd -c /etc/mosquitto/conf.d/passwd pi”之后输入的密码 : http://www.rs-online.com/designspark/electronics/eng/blog/building-distributed-node-red-applications-with-mqtt
输入以下指令以安装更新及必要的组件并重启树莓派:
- $ sudo apt-get update
- $ sudo apt-get upgrade
- $ sudo pip-3.2 install paho-mqtt
- $ sudo reboot
打开Python及贴上以下指令并储存为LED.py
#!/usr/bin/env python
import paho.mqtt.client as mqtt
import os
import sys
from time import sleep
import RPi.GPIO as GPIO
user = os.getuid()
if user !=0:
print "Please run script as root"
sts.exit()
LED=4
GPIO.setmode(GPIO.BCM)
GPIO.setup(LED, GPIO.OUT)
def pressed(msg):
if msg == "On":
GPIO.output(LED,True)
if msg == "Off":
GPIO.output(LED,False)
def on_connect(client, userdata, flags, rc):
client.subscribe("switch")
def on_message(client, userdata, msg):
print("got message on topic %s: %s" % (msg.topic, msg.payload))
msgTemp = msg.payload
pressed(msgTemp)
client = mqtt.Client()
client.username_pw_set(username="pi", password="pipi")
client.on_connect = on_connect
client.on_message = on_message
client.connect(" 地址 >", 1883)
try:
client.loop_forever()
except KeyboardInterrupt:
print("interrupted!")
输入以下指令以重新运行Mosquitto:
- $ sudo /etc/init.d/mosquito stop
- $ sudo mosquitto
在Terminal 输入以下指令以作运行步骤11的指令:
- $ sudo python \LED.py