16. Applications and implications

For this week I need to propose a final project masterpiece that integrates the range of units covered. Where possible, My project should incorporate: - 2D and 3D design - additive and subtractive - fabrication grocesses - electronics design and production - microcontroller interfacing and programming - system integration and packaging

What will it do?

My idea is to have self sterilization door handle, so that once the door is opened or closed the UV light will be operated to clean and kill the germs on the handle, the device will detect the movement of the door once it get back to rest it will start killing the germs of the door handle.

Who’s done what beforehand?

there are different project which aims to clean the users hands after using the door handle with a sanitizer, Handle Hygiene is one of the solution which is an Automatic Door Handle Sanitizing dispenser system for door handles. Every time a door is used, the system delivers a mist of disinfectant onto the handle, sanitizing it after each opening,

but in my project I aim to clean the door handle with different approach this is by using the UV light after the door handle is used.

What will you design?

  • the case of the device that will be attached to the door handle.
  • The electronic circuit to control and operate the uv light.

What materials and components will be used?

The case will be 3d printed using the PLA filament, due to the fact that it recyclable and easy to print.

For electronic circuit I will fabricate my own microcontroller with FR1 board.

As for the component I will be using the MPU 6050 to measure the angular movement of the door so this gonna be my input sensor, also I will be using the UV LED strip to be operated once the door is closed

Where will come from? How much will they cost?

Most of the components are provided by the fablabuae, and the other components bought from online local suppliers, the estimated cost of the parts is as the following:

Material Source Cost(USD)
FR4 Copper Clad Single Fablabuae $4
3D Printer Filament PLA Fablabuae $80
UV Black Light 395-405nm amazon $30
Lithium Polymer ion Battery Pack with JST Connector Fablabuae $15
3.7V 650mAh Lipo battery Rechargeable amazon $ 15
Atmega328 Fablabuae $18.99
capacitors:CAP CER 10UF 35V Y5V 1206 Fablabuae $0.5
transistors: MOSFET N-CH 30V 1.7A SSOT3 Fablabuae $1.13
LEDs 1206 SMD Fablabuae $0.13
MPU6050 banggood $15
Total $179.75

as you can see that the total cost of the project is 179.75$

What parts and systems will be made?

The majority of the part I will be making it in the lab:

1- the main body which consist of two parts the upper and the lower

2- The electronic board

3- project stickers

What processes will be used?

  • 3D printing for the main body

  • laser cutter for small piece to acrylic to emit the UV light.

  • electronic production to fabricate my PCB’s

What questions need to be answered?

  • How to convert the raw data from the mpu 6050 to a useful information to measure the angular movement of the door.

  • How to attach my device to the door handle

How will it be evaluated

I will not be able to measure the effectiveness of the idea of using the UV light where I don’t have the tool needed to evaluate it, but according to different studies which tells that the UVC light can kill the germs once the surface gets exposed to its radiation according to link also according to healthline journal written be Jill Seladi, elaborate the effectiveness of using the UV-C light UVC light on killing germs like viruses and bacteria through damaging molecules like nucleic acids and proteins. but I will be OK if I the device could tell when the door is closed and operate the UV light accordingly.