In this project, we have presented a disinfection system for disinfecting helmets. This system is based on ultra-violet sterilizer technology. This system is helpful for disinfecting helmets.What is ultraviolet? 
Ultraviolet light is part of the light spectrum, which is classified into three wavelength ranges:
- UV-C, from 100 nanometers (nm) to 280 nm
- UV-B, from 280 nm to 315 nm
- UV-A, from 315 nm to 400 nm
What is germicidal ultraviolet? 
UV-C light is germicidal – i.e., it deactivates the DNA of bacteria, virus and other pathogens and thus destroys their ability to multiply and cause disease. Specifically, UV-C light causes damage to the nucleic acid of microorganisms by forming covalent bonds between certain adjacent bases in the DNA. The formation of such bonds prevent the DNA from being unzipped for replication, and the organism is unable to reproduce. In fact, when the organism tries to replicate, it dies.
What are the beneficial uses of germicidal ultraviolet? 
Ultraviolet technology is a non-chemical approach to disinfection. In this method of disinfection, nothing is added which makes this process simple, inexpensive and requires very low maintenance. Ultraviolet purifiers utilize germicidal lamps that are designed and calculated to produce a certain dosage of ultraviolet (usually at least 16, 000 microwatt seconds per square centimeter but many units actually have a much higher dosage.) The principle of design is based on a product of time and intensity – you must have a certain amount of both for a successful design.Here are just a few of the applications… 
- under sink installs & water vending machines
- boats & recreational vehicles
- water wells & water cisterns
- swimming pool & hot tubs
- farms, ranches & trailer parks
- schools & hotels
- aquarium, hatcheries and nurseries
- ice making
- brewery & winery
- soft drinks, fruit drinks and juices
- bottling facilities
- dairy processing
- liquid sugars, sweeteners and edible oils
- water based lubricants
- pure wash water
- pharmaceutical production
- laboratories, hospitals and clinics
- maternity labor and delivery areas
- pathology labs, kidney dialysis
- animal husbandry
How do ultraviolet purifiers work? 
- cosmetics and electronic production
- pond & lake reclamation
- laundry water
Atlantic Ultraviolet Corporation’s purifier units contain one or more germicidal ultraviolet lamps. STER-L-RAY® Germicidal Lamps are shortwave, low pressure tubes that produce ultraviolet wavelengths lethal to microorganisms. Approximately 95% of the ultraviolet energy emitted from STER-L-RAY® germicidal lamps is at 254 nanometers, the region of germicidal effectiveness most destructive to bacteria, mold and virus. Therefore, the water or air that passes through the chamber is exposed to the germicidal uv light and the genetic material of the microorganism is deactivated, which preventing them from reproduction and rendering them harmless.
We have created a sterile box to disinfect helmets using the features of UV sterilizer technology. The box can also be used to disinfect other things. In this pandemic situation (COVID-19), we should disinfect everything before and after using it.Necessary things
Building the system
- Arduino UNO (microcontroller)
- UV germicidal Lamps.
- Push Button
- Mosfet Switch
- Power supply
- PVC boards
- Wires/jumper wires
We make the box according to the standard measurements of the helmet. PVC/ boards are used to make this box. We put some UV-lamps inside the box. These lamps are used for disinfection. We used a low cost microcontroller to control the whole sanitation process. We include a buzzer and a push button that make the system more user friendly.
Please note, we used UV LEDs to develop this prototype.
Prototype Helmet Sterilization box.