Waveshare Digital LTR390-UV Ultraviolet Sensor (C) Ultraviolet Ray Sensing Ambient Light Intensity Measuring Direct UV Index Value Output I2C Bus Review

I used this to test several UV lamps I bought to kill COVID-19 virus. It turned out that several lamps sold as UV lamps were just normal black lamps and did not emit UV-C at all. To measure UVC, connect it to a 5V DC power supply and a digital meter. They aim the ultraviolet light directly at the sensor. Then cover the sensor with glass and measure again. If your light source is UVC, there will be a large voltage drop when measuring light through glass. Because glass blocks UV rays.

Another great sensor for your Arduino project. Easy to connect to your Arduino, VCC, GND and analog output. As with all sensors, the real trick is figuring out what the output means, but there are plenty of resources online to help.

Works fine but no documentation so I don't know for example if the output is linear or how to convert readings to actual UV values. The output is low. With a 5V power supply, the maximum readings I got in sunlight were about 1/2V. The supposed variable amplifier doesn't seem to be working. Turning the potentiometer does not affect the readings.

I used this to test a couple of UV bulbs I bought to kill COVID-19 viruses. It turned out that several lamps sold as UV lamps were just normal black lamps and did not emit UV-C at all. To measure UVC, connect it to a 5V DC power supply and a digital meter. They aim the ultraviolet light directly at the sensor. Then cover the sensor with glass and measure again. If your light source is UVC, there will be a large voltage drop when measuring light through glass. Because glass blocks UV rays.

This UV sensor works perfectly. It also works to detect blue and UV LEDs. You can hold it up to different light sources to see if it emits UV radiation. I tested the sensitivity by pointing a UV flashlight at the sensor and turning the dial (potentiometer). There seems to be a difference when it is (carefully) turned fully clockwise. The sensor puts out a tiny voltage, so it needs a fairly bright light source to work. To convert the analog output to a true UV Index value, find the current UV…

I really like this detector! Calibrated A/B and C UV detectors typically cost $150 to $300. Of course they give you an accurate reading of power per square centimeter, which isn't what you'd expect from this sensor, but it does give you a relative measure of intensity. The detector generates an analog signal that can be read with a microcontroller or voltmeter. I've attached some pictures showing voltage readings at a distance of about 11-12 cm from various bulbs. If you are interested in…