VEML6070

[Andrew Mamohin]

I have installed a VEML6070 sensor. It works well, I can transfer any of the three parameters from ESPeasy to my domotics. But, I do not understand what these parameters mean. How can I find out the ultraviolet index? https://en.wikipedia.org/wiki/Ultraviolet_index
How to set the switch "Refresh Time Determination" correctly? I even looked at the source code of the plugin, but I didn't understand anything.

[TD-er]

The plugin itself has this mentioned in the comments about the "UV Risk" value:

Code: Select all

// Definition of risk numbers
//  0.0 - 2.9  "Low"      = sun->fun
//  3.0 - 5.9  "Mid"      = sun->glases advised
//  6.0 - 7.9  "High"     = sun->glases a must
//  8.0 - 10.9 "Danger"   = sun->skin burns Level 1
// 11.0 - 12.9 "BurnL1/2" = sun->skin burns level 1..2
// 13.0 - 25.0 "BurnL3"   = sun->skin burns with level 3

Given the values, which correlate with the Wikipedia link you gave, I guess those are the same.

Also it looks like the sensor datasheet is also more elaborate than usual on this subject:
https://www.vishay.com/docs/84310/designingveml6070.pdf

[Andrew Mamohin]

My "risk" value is low (0.01-0.1). This is strange. And what about a switch "Refresh Time Determination"? It greatly affects the readings.

[TD-er]

I have not played with this sensor myself, so I cannot give a proper answer on that.
If your weather is a bit like it is here in the Netherlands, then I cannot imagine the UV risk will be any higher than very very low as it is grey and the sunlight doesn't have any power right now.

[Andrew Mamohin]

The sun shone a little during the day. The value went up to 0.5. Maybe you need to *10?

[TD-er]

Maybe your metrology service does have a local weather station reporting the UV index so you can see what range to expect?

[Andrew Mamohin]

Maybe your metrology service does have a local weather station reporting the UV index so you can see what range to expect?

A good idea! I looked: during the day, the index grew from 0 to 2.
I guess I'll have to take RAW and count according to this table.

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