Teil 1

VEML_6070/README.md

@@ -0,0 +1,53 @@
+# 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 

VEML_6070/vemltest_extended/vemltest_extended.ino

@@ -0,0 +1,82 @@
+#include <Wire.h>
+#include "Adafruit_VEML6070.h"
+
+Adafruit_VEML6070 uv = Adafruit_VEML6070();
+
+void setup() {
+  Serial.begin(9600);
+  Serial.println("VEML6070 Test");
+  uv.begin(VEML6070_2_T);  // pass in the integration time constant
+  /*
+  possible integration times: -> adapt the convert_to_risk_level-function accordingly!
+    VEML6070_HALF_T ~62.5ms
+    VEML6070_1_T ~125ms
+    VEML6070_2_T ~250ms
+    VEML6070_4_T ~500ms
+
+   */
+}
+
+
+//Source: https://github.com/adafruit/Adafruit_CircuitPython_VEML6070/blob/main/adafruit_veml6070.py
+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;
+}
+
+/*
+// German equivalent
+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 = "Niedrig (UV 0-2)";
+  else if(reading > 560 && reading <= 1120)
+      risk_level = "Mittel (UV 3-5)";
+  else if(reading > 1120 && reading <= 1494)
+      risk_level = "Hoch (UV 6-7)";
+  else if(reading > 1494 && reading <= 2054)
+      risk_level = "Sehr Hoch (UV 8-10)";
+  else if(reading > 2054 && reading <= 9999)
+      risk_level = "Extrem (UV >10)";
+  else
+      risk_level = "ERROR";
+
+  return risk_level;
+}
+*/
+
+void loop() {
+  int reading = uv.readUV();
+  
+  Serial.print("UV light level: "); 
+  Serial.print(reading);
+  Serial.print("  Risk level is: ");
+  Serial.println(convert_to_risk_level(reading));
+  
+  delay(1000);
+}