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demo1: rtu io and gps positioning

**This demo requires the following modules to be installed **:
  node-red-dashboard
  node-red-contrib-nmea
  node-red-contrib-ui-led
  node-red-contrib-web-worldmap

**Install module by:**
use the "Menu -> Manage palette -> Install" option and search for module

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demo2: mqtt publish & subscribe

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demo3: read/write message by serialport

**This demo requires the following modules to be installed :**
  node-red-node-serialport

**Install module by :**
use the "Menu -> Manage palette -> Install" option and search for module

**Device node of COM Port **
COM1: /dev/ttyUSBS0
COM2: /dev/ttymxc1
COM3: /dev/ttyUSBS2

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demo4: Capture image via webcam

**This demo requires the following modules to be installed :**
  node-red-contrib-usbcamera
  node-red-contrib-image-tools

**Install module by :**
use the "Menu -> Manage palette -> Install" option and search for module

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demo5: Using Google's Teachable Machine

**This demo requires the following modules to be installed :**
  node-red-contrib-usbcamera
  node-red-contrib-image-tools
  node-red-contrib-teachable-machine

**Install module by :**
use the "Menu -> Manage palette -> Install" option and search for module


