Enhanced the UVSensor example with 1 decimal to the UVI index.

Because the UVI graph is almost lineair
This gives a more accurate overview
Also the UVI is send at least every 5 minutes, this is good for the controller to know the sensor is still 'alive'

Author: gizmocuz

libraries/MySensors/examples/UVSensor/UVSensor.ino

@@ -1,62 +1,85 @@
+#include <SPI.h>
+#include <MySensor.h>  
 /*
-  Vera Arduino UVM-30A
+  Arduino UVM-30A
 
   connect the sensor as follows :
 
   +   >>> 5V
   -   >>> GND
   out >>> A0     
   
-  Contribution: epierre, bulldoglowell
-  Converted to 1.4 by Henrik Ekblad
+  Contribution: epierre, bulldoglowell, gizmocuz
+
+  Index table taken from: http://www.elecrow.com/sensors-c-111/environment-c-111_112/uv-sensor-moduleuvm30a-p-716.html
+  Because this table is pretty lineair, we can calculate a UVI with one decimal 
 
   License: Attribution-NonCommercial-ShareAlike 3.0 Unported (CC BY-NC-SA 3.0)
- 
 */
 
 #include <MySensor.h>  
 #include <SPI.h>
 
-#define CHILD_ID_UV 0
 #define UV_SENSOR_ANALOG_PIN 0
+
+#define CHILD_ID_UV 0
+
 unsigned long SLEEP_TIME = 30*1000; // Sleep time between reads (in milliseconds)
 
 MySensor gw;
 MyMessage uvMsg(CHILD_ID_UV, V_UV);
-int lastUV = -1;
-int uvIndexValue [13] = { 50, 227, 318, 408, 503, 606, 696, 795, 881, 976, 1079, 1170, 3000};
-int uvIndex;
+
+unsigned long lastSend =0; 
+float uvIndex;
+float lastUV = -1;
+int uvIndexValue [12] = { 50, 227, 318, 408, 503, 606, 696, 795, 881, 976, 1079, 1170};
 
 void setup()  
 { 
   gw.begin();
 
   // Send the sketch version information to the gateway and Controller
-  gw.sendSketchInfo("UV Sensor", "1.1");
+  gw.sendSketchInfo("UV Sensor", "1.2");
 
   // Register all sensors to gateway (they will be created as child devices)
   gw.present(CHILD_ID_UV, S_UV);
-
 }
 
 void loop()      
-{     
-  uint16_t uv = analogRead(0);// Get UV value
-  Serial.print("Uv reading: ");
-  Serial.println(uv);
-  for (int i = 0; i < 13; i++)
+{
+  unsigned long currentTime = millis();
+  
+  uint16_t uv = analogRead(UV_SENSOR_ANALOG_PIN);// Get UV value
+  if (uv>1170)
+    uv=1170;
+    
+  //Serial.print("UV Analog reading: ");
+  //Serial.println(uv);
+  
+  int i;
+  for (i = 0; i < 12; i++)
   {
     if (uv <= uvIndexValue[i]) 
     {
       uvIndex = i;
       break;
     }
   }
-  Serial.print("Uv index: ");
-  Serial.println(uvIndex);
+  
+  //calculate 1 decimal if possible
+  if (i>0) {
+    float vRange=uvIndexValue[i]-uvIndexValue[i-1];
+    float vCalc=uv-uvIndexValue[i-1];
+    uvIndex+=(1.0/vRange)*vCalc-1.0;
+  }
+
+  //Serial.print("UVI: ");
+  //Serial.println(uvIndex,2);
 
-  if (uvIndex != lastUV) {
-      gw.send(uvMsg.set(uvIndex));
+  //Send value to gateway if changed, or at least every 5 minutes
+  if ((uvIndex != lastUV)||(currentTime-lastSend >= 5*60*1000)) {
+      lastSend=currentTime;
+      gw.send(uvMsg.set(uvIndex,2));
       lastUV = uvIndex;
   }