[1] Eli the computer Guy,"PIR Sensor on Arduino (HC-SR501)", 2019.[Online].Available: https://www.youtube.com/watch?v=ZQP0ybVR-rg

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[2] LEADER Tianan Automatic Door, "Detail installation for the automatic swing door opener with push arm", 2016.[Online].Available: https://www.youtube.com/watch?v=XBEk3aX0X5w

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[3] SciFri, “The Big Sort: An Insider's Tour of a Recycling Plant”, 2016. [Online]. Available: https://www.youtube.com/watch?v=nUrBBBs7yzQ

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[4] Homewood Disposal, “Sorting and Recycling Facility - Follow the Process”, 2015. [Online]. Available: https://www.youtube.com/watch?v=3Lzsu8SXaWY

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[5] "Ionization vs photoelectric", nfpa.org.[Online].Available: https://www.nfpa.org/Public-Education/Staying-safe/Safety-equipment/Smoke-alarms/Ionization-vs-photoelectric#:~:text=How%20they%20work%3A%20Ionization%2Dtype,current%20and%20activating%20the%20alarm..

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[6] Christian de Looper, "Smart locks: everything you need to know about intelligent deadbolts", techradar.com, 2017.[online].Available: https://www.techradar.com/news/smart-locks

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[7] Bulk Handling Systems (BHS), “BHS Team Talks Max-AI™”, 2017. [Online]. Available: https://www.youtube.com/watch?v=NLzZ1wEFxJY&t=63s

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[8] CNBC, “Why The United States Is Turning To Recycling Robots”, 2019. [Online] Available: https://www.youtube.com/watch?v=1mxaN_xqQh4

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[9] RealPars, "What is a Load Cell?", 2019.[Online].Available: https://www.youtube.com/watch?v=xFgHG12t-ug&t=308s

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[10] Dara Trent, "Strain Gauge Load Cell Basics", 800loadcel.com.[Online]. Available: https://www.800loadcel.com/load-cell-and-strain-gauge-basics.html

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[11] Equil, “Introducing the Equil Smartmarker”, 2015. [Online] Available: https://www.youtube.com/watch?v=QDP-4bxYsbA&feature=youtu.be

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[12] Unbox Daily, “9 Best Smart Pens Reviews”, 2018. [Online]. Available: https://www.youtube.com/watch?v=YJ83SFl553k&feature=youtu.be

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[13] C. Woodford, “Digital pens,” Explain that Stuff, 24-Dec-2019. [Online]. Available: https://www.explainthatstuff.com/digitalpens.html. [Accessed: 29-May-2020].

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[14] Electronoobs, "How STRAIN GAUGE Works | Precision SCALE With Arduino", 2020. [online].Available:    https://www.youtube.com/watch?v=LRd3W_p8PJ4&t=5s

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[15] PiddlerinTheRoot, "USB Barcode Scanner (Raspberry Pi)", 2017.[Online]. Available: https://www.youtube.com/watch?v=ywakseuir-o

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