53 lines
2.2 KiB
Markdown
53 lines
2.2 KiB
Markdown
# VEML6070 UV Sensor
|
|
|
|
[<img src="VEML_6070.png" width="200px">](VEML_6070.png)
|
|
|
|
The VEML6070 is a UV sensor with I2C-Interface.
|
|
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.
|
|
|
|
> 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.
|
|
|
|
## Using the Sensor with Arduino
|
|
The sensor can be easily connected to the I2C pins of the Arduino (for Arduino UNO + Nano these are the pins A4 and A5).
|
|
|
|
To read the measurements the `Adafruit_VEML6070`-Library can be used.
|
|
It can be installed directly via the Arduino Library Manager. Alternatively, it can be downloaded from GitHub: https://github.com/adafruit/Adafruit_VEML6070
|
|
|
|
|
|
## Convert measurements to UV-Risk level
|
|
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.
|
|
|
|
I adapted the Circuit Python code and created an extended example sketch with risk-level-conversion.
|
|
|
|
```
|
|
String convert_to_risk_level(int reading)
|
|
{
|
|
int integration_time = 4; //available for Integration-Time 1, 2, 4
|
|
// MUST be adjusted according to the set integration time
|
|
reading = reading / integration_time;
|
|
|
|
String risk_level;
|
|
|
|
if(reading <= 560)
|
|
risk_level = "LOW (UV 0-2)";
|
|
else if(reading > 560 && reading <= 1120)
|
|
risk_level = "Moderate (UV 3-5)";
|
|
else if(reading > 1120 && reading <= 1494)
|
|
risk_level = "High (UV 6-7)";
|
|
else if(reading > 1494 && reading <= 2054)
|
|
risk_level = "Very High (UV 8-10)";
|
|
else if(reading > 2054 && reading <= 9999)
|
|
risk_level = "Extreme (UV >10)";
|
|
else
|
|
risk_level = "ERROR";
|
|
|
|
return risk_level;
|
|
}
|
|
|
|
|
|
```
|
|
|
|
## You can the full example sketch [here](./vemltest_extended/vemltest_extended.ino).
|
|
|
|
<br>
|
|
References/Sources: https://cdn-learn.adafruit.com/downloads/pdf/adafruit-veml6070-uv-light-sensor-breakout.pdf |