Building the device is divided into different parts. 

• Enclosure 
• Electronics
• Electricals
• Arduino code
• UVC - light
• Infrared Heater
• Fixtures

- Enclosure 

The device enclosure is divided into 3 parts

• The main box, 
• The electronics box &The electricals box

Instructions: 

1. Use 8mm or 10mm wood to laser cut the 2 files of the main box and the electrical and electronics box. The laser cut file is available on GitHub.

This file is for the main box. Refer to the files on GIThub for 8mm or 10mm.

This file is for the electronics & electrical box. Refer to the files GIThub for 8mm or 10mm.

Aluminium tape

Use a generous amount of aluminium foil tape to cover the inside of the box, both the top enclosure and the bottom. The aluminum foil tape with adhesive on one side is recommended over the aluminium foil from the kitchen in order to avoid tearing of the foil.

The reference we used, for example: https://fr.rs-online.com/web/p/rubans-aluminium/0176573/

Electronics

1) Circuit connection diagram, For detailed list of components please refer to the BOM.

2) Arduino pin mapping.  

3) Schematics of the electrical and Electronics of the Face mask disinfection device (FMDD)

Remark:

If your Infrared heater has two bulbs, you should wire only one of them

Internal view of the electronics and electricals fit into the wooden box. On the right side compartment is the electronics and on the left side compartment is the electricals of the device.

Back of the control board, Use Hot glue to keep the board in place.

Front view of the electronics box - which displays the temperature and humidity.

Arduino code

1) Source code is available here:

https://github.com/NeedLab/face-mask-disinfection-device/blob/master/arduino/face-mask-disinfection-device/face-mask-disinfection-device.ino

2) Finite state Diagram

3) Link to the user manual:
https://hackaday.io/project/172189/instructions

Fixing details

Infrared heater fixing details 

Use of standard brackets to keep the infrared in place. 

Placement and positioning of the infrared heater. 

Use of the metal plate on top of the infrared heater in order to radiate heat into the air

not with direct infrared radiations. 

Top view of the infrared heater with the metal plate and the insulated cables.

The cables are used to make a rack where the masks will be placed in order for them to get exposed to the heat. 

Weaving of the cables. Equidistant and uniform with the help of the Laser cut holders on both sides of the box.

Fix the UV-C light on the other side of the box.

Place the masks in the rack.

Light leak test. 

It is very important to make a dark room light leak test. => use a battery powered visible light source. Put it inside the box closed and check the leaks cover all the holes/ leaks if found, using some foam gasket and / or some borders

This will give clear indication if any UV-C light is leaking from the box in order to avoid any damage to your eyes.

WARNING:

You must be aware that UV-C radiation is very dangerous for your eyes and skin. The UV-C light must be switched ON only when the top cover of the device is closed and switched off when the device is open.

Due to the unseen danger of UV-C, one must check that the device is light proof. Remember, that the visible radiation of germicide tube is just a by product and it's only 3/4% of total emission, there's a big risk of emission leak and one doesn’t perceive it. One has to conduct a light test by checking for light leaks around the device/enclosure in a completely dark environment. One has to cover all the holes/ leaks if found, using some foam gasket and / or some borders to avoid this risk of UV-C leaks outside of the device.