In 2019, Covid19 surprised everyone. We had to wear face masks and gloves to protect ourselves from anything we touched because of how quickly and effectively it spread. There are numerous more viruses in the Coronavirus family that have not yet infected humans; SARS-COV-2 is just one of them. We now know from this epidemic that we should be ready for pandemics of this nature.
We can use masks to protect ourselves from the elements outside, but what about the items we bring home every time? We are unable to use hand sanitizer on items like cell phones that doctors and patients, or coworkers exchange.
Additionally, using sanitizers requires the use of chemicals that are bad for our health and the environment, not to mention the ongoing expense of purchasing sanitizers. We use a clever electronics system driven by a microcontroller to solve this enormous difficulty. To address the problem, we develop a small 360-degree disinfection box that uses ultraviolet sterilization. The system uses UV-C tubes to carry out this function. Now, it has been demonstrated that UV C instantly kills all viruses.
According to Arthur Reingold, director of epidemiology and biostatistics at the University of California, Berkeley School of Public Health, ultraviolet radiation can effectively kill viruses. It is frequently used to destroy microorganisms in hospital rooms, either through indirect or direct exposure, on surgical instruments and surfaces, as well as to clean up and handle wastewater.
The COVID Cellphone and cash Disinfection box has the following Key Aspects
- Full-body disinfection
- Deactivates all CoronaViruses, as Proven
- Automatic Shutoff and Alerting based on a Timer
- Can sanitize electronic devices, packaged food, masks, etc.
- Adjustable Sterilization Timer
- Auto-Security Shutoff
- Simple to Use
- Environmentally friendly with no water or chemicals
Components Required
- Atmega 328 Controller
- LCD Display
- Buzzer
- Lid Sensor
- UV-C Tubes
- Buttons
- Metal Mesh
- LED’s
- IC’s
- Resistors
- Capacitors
- Diodes
- Transistors
- Transformer
- Base frame
- Supporting Frame
- Mounts and Joints
- Screws and Bolts
Circuit Diagram
- Arduino Mega 2560
The microcontroller ATmega 2560 features 16 analog inputs, a 16 MHZ crystal oscillator, a USB connection, power, ICSP, and a reset button. It also has 54 digital inputs/outputs, 16 of which are used as PWM outputs. This Arduino performance needs a microcontroller to function, so you may switch it on with AC or DC current or batteries by plugging it into a computer with a USB wire.
- Piezo buzzer
 Piezo is commonly used as a speaker that has a high-pitched sound output. Piezo is needed if Arduino is used in projects that require sound as an indicator [4]. Piezo works by utilizing a surging electric current which is then converted into vibrations and the vibrations propagate through the air (turning into sound). In its use, piezo is usually applied to home security alarms, fire alarms, weaker clocks, sensors for car parking, and others.Â
- UV-GI (Ultraviolet Germicidal Irradiation) Modules
UV-GI (ultraviolet germicidal irradiation) modules are commonly made from low pressure mercury lamps that generate light with a wavelength ranging from 100 to 290 nm, usually at 254 nm. This wavelength is close to the 265 nm threshold at which bacteria can be killed [1]. Ozone, a reactive oxygen byproduct produced as a byproduct of mercury lamps, has the ability to kill germs. Studies have shown that ozone mixed with light sources releasing UV-C inactivates MS2 bacteriophages in a substantially shorter amount of time than UV-C alone. Due to regulations on ozone emissions and the harmful effects ozone has on human health, this system is constrained.
Working Principle
When the start button is hit, the Atmega controller begins sterilizing and accepts human input for the time setting. Upon completion of the sterilizing period, it turns off automatically. Additionally, if the lid is opened by the user while sterilization is still in progress, an automated shutdown system stops the sterilization.
Push buttons and an LCD display make up the system used to control this device. The period of sterilization is set using the push buttons. Through proximity sensors, the Atmega controller determines if the lid is closed after setting. The controller turns on UV tubes for the predetermined amount of time after detecting a closed lid to ensure adequate sterilization. The controller turns off the UV tubes and sounds a siren to signal when sterilization is finished.
The controller also automatically turns off the UV tubes if the user opens the box while the sterilizing procedure is still in progress because direct UV exposure can be dangerous. This guarantees a sterilizing procedure devoid of water and chemicals that can aid in preventing the development of COVID 19.
Conclusion
I hope all of you have understood How to Design Mobile Phone & Cash UV Disinfector for COVID. We MATHA ELECTRONICS will be back soon with more informative blogs soon.