53 lines
2.2 KiB
Markdown
53 lines
2.2 KiB
Markdown
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# VEML6070 UV Sensor
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[<img src="VEML_6070.png" width="200px">](VEML_6070.png)
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The VEML6070 is a UV sensor with I2C-Interface.
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It measures the UV light level but **NOT** the UV-Index. However, it is possible to convert the sensor readings to an equivalent UV-risk level/UV-Index.
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> Unlike the Si1145 (http://adafru.it/1777), this sensor will not give you UV Index readings. However, the Si1145 does UV Index approximations based on light level not true UV sensing. The VEML6070 in contrast does have a real light sensor in the UV spectrum.
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## Using the Sensor with Arduino
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The sensor can be easily connected to the I2C pins of the Arduino (for Arduino UNO + Nano these are the pins A4 and A5).
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To read the measurements the `Adafruit_VEML6070`-Library can be used.
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It can be installed directly via the Arduino Library Manager. Alternatively, it can be downloaded from GitHub: https://github.com/adafruit/Adafruit_VEML6070
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## Convert measurements to UV-Risk level
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The conversion is implemented in the equivalent Adafruit library for Circuit Python (https://github.com/adafruit/Adafruit_CircuitPython_VEML6070). However it is not implemented in the Arduino version.
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I adapted the Circuit Python code and created an extended example sketch with risk-level-conversion.
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```
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String convert_to_risk_level(int reading)
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{
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int integration_time = 4; //available for Integration-Time 1, 2, 4
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// MUST be adjusted according to the set integration time
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reading = reading / integration_time;
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String risk_level;
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if(reading <= 560)
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risk_level = "LOW (UV 0-2)";
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else if(reading > 560 && reading <= 1120)
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risk_level = "Moderate (UV 3-5)";
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else if(reading > 1120 && reading <= 1494)
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risk_level = "High (UV 6-7)";
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else if(reading > 1494 && reading <= 2054)
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risk_level = "Very High (UV 8-10)";
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else if(reading > 2054 && reading <= 9999)
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risk_level = "Extreme (UV >10)";
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else
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risk_level = "ERROR";
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return risk_level;
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}
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```
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## You can the full example sketch [here](./vemltest_extended/vemltest_extended.ino).
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<br>
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References/Sources: https://cdn-learn.adafruit.com/downloads/pdf/adafruit-veml6070-uv-light-sensor-breakout.pdf
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