Introduction

UV rays are reputed to have versatile traits in varied capacities. With the ailing results
of the cell display screen, and as a result of growing recognition of the Good watches, many people
look into the face of a wise watch, very first thing within the morning. The problem is – Is it secure? Does it emit UV rays that would harm your eyes?

The current article is related to “Parishuddhi Yantra”, a funded challenge sponsored price ₹ 32,000/- INR by SSIP 1.0, SSIP Cell, Govt of Gujarat, India.

The proposed setup is used to verify the depth of ultraviolet (UV) rays generated by a UV C Lamp typically meant for sanitization functions. Additionally, we now have investigated the emission of UV rays by a smartwatch to disclose its depth and harmfulness. Determine 1 exhibits the creator’s prototype of varied experiments. It demonstrates the responsivity throughout varied wavelengths and the variation within the output voltage with respect to the UV index. Determine 2 is the block diagram illustration of your complete setup.

The GUVA-S12SD UV Sensor chip is appropriate for detecting UV radiation that’s generated by any mild supply be it daylight, hearth, torch, lamps, LEDs, warmth lamps. It may be utilized in any utility the place you wish to monitor for the quantity of UV mild and is straightforward to hook up with any microcontroller. It’s an analog UV mild to voltage converter for measuring the depth of UV mild. It’s a true UV detector that solely detects mild from 240nm to 370nm which is the UV-B and a lot of the UV-A spectrum. It additionally picks up the higher finish of the UV-C spectrum.

The UV Index is a crucial automobile to boost public consciousness of the dangers of extreme publicity to UV radiation, and to alert folks about the necessity to undertake protecting measures. As a part of a world effort, the UV index was developed by the World Well being Group (WHO), the United Nations Setting Programme, the World Meteorological Group and the Worldwide Fee on Non-Ionizing Radiation Safety. Determine 3 represents the broadly accepted UV Index chart. As evident from determine 3, the smaller indices symbolize lesser depth. The upper intensities are meant for variable duties like in industrial processes, medical and dental practices for quite a lot of functions, comparable to killing micro organism, creating fluorescent results, curing inks and resins, phototherapy and solar tanning. The aim varies with respect to the wavelengths and the intensities. UV lamps emit radiation that is sufficient to kill germs. They’re utilized in healthcare to sterilize surgical devices. UV rays are additionally used within the purification of water and the pharmaceutical business.

GUVA-S12SD is a Gallium Nitride materials primarily based Schottky-type photodiode, optimized for photovoltaic mode operation. It’s adopted by an Op-Amp IC SGM8521. It’s a rail-to-rail enter and output voltage suggestions amplifier. Op-Amps that use the whole span between unfavourable and constructive provide voltages are known as as rail to rail op-amps. Regular op-amps have a most voltage swing and can’t use the entire span of energy provide. Rail to rail op-amps can use the whole span of energy provide thereby growing the obtainable sign vary. This Op-Amp has a large enter common-mode voltage vary and output voltage swing, and takes the minimal working provide voltage right down to 2.1V and the utmost really helpful provide voltage is 5.5V. Moreover, SGM8521 supplies 150kHz bandwidth at a low present consumption of 4.7 μA. Determine 4 covers most of those facets in most element.

1. UV sensor- CJMCU-GUVA-S12SD(MOD 1)
2. Arduino UNO R3 (MOD2)
3. UVC lamp (MOD3)
4. Jumper wires

Specs of the Sensor:

1. Low energy consumption
2. Energy provide voltage of two.5 V ~ 5 V
3. Working present is microamps.
4. Excessive sensitivity
5. Excessive stability
6. Huge detection vary: 240 nm to 370 nm
7. Huge Angle: 130 levels
8. Schottky kind photosensitive diode
9. Dimension: 11 mm x 27 mm

When the sunshine rays emitted by any supply falls on the photodiode of the UV sensor, it generates a worth. This sensor worth is learn utilizing the analog learn command. Corresponding voltage is evaluated and each the values are displayed on the serial monitor. The identical sensor is examined with a Good watch and a UV C lamp each. Determine 7 exhibits the everyday readings of the good watch.

The UVC lamp used for testing is a particular objective lamp, typically focused in direction of sanitization duties. Following are its specs: Bulb form measurement A21, with a bulb base E27, Incandescent, 4000 Kelvin, 22,500 Lumen, 250 Watts having common lifetime of 5000 hours, manufactured by Philips on the Republic of Korea. Determine 8 exhibits the studying of lamp.

On a conclusive notice, the good watch does emit UV rays within the vary of 0-2 UV Index which is the vary of minimal hazard and can’t be thought of dangerous for people.

Arduino Code:
void setup()
{
Serial.start(9600);
}
void loop()
{
float sensorVoltage;
float sensorValue;
sensorValue = analogRead(A0);
sensorVoltage = sensorValue/1024*5.0;
Serial.print("sensor studying = ");
Serial.print(sensorValue);
Serial.print(" sensor voltage = ");
Serial.print(sensorVoltage);
Serial.println(" V");
delay(10000);
}

Acknowledgement:
We’re grateful to SSIP Cell, Govt of Gujarat for funding the challenge

Dr. Geetali Saha is a college of the division of Electronics and Communication Engineering, GCET, Anand, Gujarat and Parth Shah from third Yr IT Engineering division is my lead pupil coordinator engaged on this sponsored challenge.