Introduction: CoronaVirus Killer With Arduino Nano and UV Light

According to the latest guideline on the diagnosis and treatment of the novel coronavirus released by the National Health Commission, the virus is sensitive to ultraviolet light and heat, so ultraviolet radiation can effectively eliminate the virus.

The problem with ultraviolet light is that it irritates the skin and increases the chances of getting skin cancer.
Precisely for this reason, through an Arduino Nano and some sensors and transducers, we can create a PCB capable of controlling a UV lamp to cause it to kill the virus without, however, turning it on with ourselves in the vicinity. In this way we will protect our skin.

Step 1: Theory Behin the UV Light

To kill the virus in closed spaces, we need a lamp of at least 1.5W per square meter. If left for at least half an hour, it will kill all viruses within a meter of you.

Specifically, if the temperature is less than 20 C or greater than 40 C or the relative humidity is greater than 60% we should keep the lamp on for longer. Although UV is effective in killing the virus indoors, UV lamps should not be used to sterilize hands or other areas of skin, as the radiation can cause skin irritation.

Step 2: Draw the Electric Scheme

In the Scheme we need an Arduino Nano (any Arduino is fine), a DHT11 temperature and humidity sensor, a buzzer, a relay, a diode, two terminal blocks and a power supply to power Arduino, transforming the 220Vac into 12vdc.

Step 3: Build the PCB

We arrange the components so that they take up as little space as possible in the PCB and order it.
I have also attached the BOM to the steps.

Step 4: Write the Code

Next you will need to upload the code to arduino. With the start button we start the cycle and arduino will keep the lamp on for half an hour if the temperature and humidity is optimal, otherwise for a whole hour.

pressing stop returns to the initial condition.

Step 5: Conclusion

Now with this PCB we can sterilize environments.

Remember not to expose yourself to contact with ultraviolet lamps because they can cause skin irritation.
I do not take any responsibility for my project, it is for illustrative purposes only.

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