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70 lines
2.9 KiB
Markdown
70 lines
2.9 KiB
Markdown
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[](https://github.com/marketplace/actions/arduino_ci)
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[](https://github.com/RobTillaart/uv-sensor/actions/workflows/arduino-lint.yml)
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[](https://github.com/RobTillaart/uv-sensor/actions/workflows/jsoncheck.yml)
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[](https://github.com/RobTillaart/uv-sensor/blob/master/LICENSE)
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[](https://github.com/RobTillaart/uv-sensor/releases)
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# uv-sensor
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Arduino sketch for analog UV sensor.
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## Description
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Image courtesy Tinytronics
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This small (type-less) UV-sensor is powered by 3.3 .. 5 V so it can be used by almost any microprocessor.
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The sensor has an analogue output that is roughly linear with the UV-index (sunlight assumed, see notes)
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| Voltage | UV index | risk of harm | Colour |
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|:---------:|:----------:|:---------------|:---------:|
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| <0.050 | 0 | low | Green |
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| 0.227 | 1 | low | Green |
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| 0.318 | 2 | low | Green |
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| 0.408 | 3 | moderate | Yellow |
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| 0.503 | 4 | moderate | Yellow |
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| 0.606 | 5 | moderate | Yellow |
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| 0.696 | 6 | high | Orange |
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| 0.795 | 7 | high | Orange |
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| 0.881 | 8 | very high | Red |
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| 0.976 | 9 | very high | Red |
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| 1.079 | 10 | very high | Red |
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| 1.170> | 11 | extreme | Purple |
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From this table the formula is derived (spreadsheet) which is pretty linear between UV 1 and 11.
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There is an extended library version which has more functionality and documentation.
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- https://github.com/RobTillaart/AnalogUVSensor
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### Notes
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Note: The sensor is not calibrated and the table is indicative for sunlight (assumption!)
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and therefore not suitable for e.g. medical or industrial usage.
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Note: UV radiation will not go through glass, so inside you will most likely always read zero.
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This may help to calibrate the zero level of the sensor.
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Note: depending on the light source used, the table above is incorrect.
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#### Sensitivity
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The sensor is sensitive for wavelengths from 200 - 370 nm, so mostly in UVB and UVA region and less in the UVC.
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https://en.wikipedia.org/wiki/Ultraviolet
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## Future
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Future development will be done in the library version only.
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- https://github.com/RobTillaart/AnalogUVSensor
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