implement uv sensor ML8511

platformio.ini

@@ -41,6 +41,10 @@ build_flags =
     -D HS1101PIN=D5
     -D dataHS1101_minchange=2
 
+    -D SENSOR_ML8511
+    -D ML8511PIN=A0
+    -D dataML8511_minchange=0.05
+
 lib_deps = 
     Adafruit BMP085 Library@1.1.0
     https://github.com/adafruit/Adafruit_TCS34725

src/main.cpp

@@ -72,6 +72,14 @@ struct sensordata
   float value_lightBH1750=0;
 #endif
 
+#ifdef SENSOR_ML8511
+  //ML8511 UV Sensor outputs an analog voltage. ML8511PIN needs to be an ADC pin
+  sensordata dataML8511;
+  float getUV_ML8511(int pin);
+  float mapfloat(float x, float in_min, float in_max, float out_min, float out_max);
+  float value_uvML8511=0;
+#endif
+
 
 #ifdef SENSOR_PIR
 // PIR Sensors HC-SR501 (modified to put out shortest pulse time short pins 5 and 6 of ic)
@@ -248,6 +256,14 @@ void setup() {
     #endif
   #endif
 
+  #ifdef SENSOR_ML8511
+    Serial.println("initializing ml8511");
+    pinMode(ML8511PIN, INPUT);
+    #ifdef dataML8511_minchange
+    dataML8511.minchange=dataML8511_minchange;
+    #endif
+  #endif
+
 
   #ifdef SENSOR_PIR
     Serial.println("initializing pir");
@@ -353,6 +369,11 @@ void setup() {
     lightMeter.readLightLevel(); //make first reading, could be 0
   #endif
 
+  #ifdef SENSOR_ML8511
+    sensorNode.advertise("uv");
+    analogRead(ML8511PIN); //first read adc. just to avoid problems
+  #endif
+
   #ifdef SENSOR_LDR
     sensorNode.advertise("light");
     analogRead(LDR_PIN); //first reading could be false
@@ -584,6 +605,36 @@ void loop_BH1750()
 }
 #endif
 
+
+#ifdef SENSOR_ML8511
+void loop_ML8511()
+{
+  sensordata &d=dataML8511;
+  
+  bool _changed=false;
+  if (millis() >= (d.lastreadtime+d.readdelay)) {
+    Serial.print("analogRead="); Serial.println(analogRead(ML8511PIN));
+    value_uvML8511 = getUV_ML8511(ML8511PIN); //uvIntensity (mW/cm^2)
+    if (fabs(d.lastsentvalue-value_uvML8511)>=d.minchange){
+      _changed=true;
+    }
+    d.lastreadtime=millis();
+  }
+
+  if (_changed || millis() >= (d.lastsent+d.senddelaymax)) {
+    Serial.print("Sending uv ML8511. reason=");
+    if (_changed) Serial.println("change"); else Serial.println("time");
+    checkESPStatus();
+
+    Homie.getLogger() << "uv " << ": " << value_uvML8511 << endl;
+    sensorNode.setProperty("uv").send(String(value_uvML8511));
+    d.lastsentvalue=value_uvML8511;
+    
+    d.lastsent=millis();
+  }
+}
+#endif
+
 #ifdef SENSOR_LDR
 void loop_LDR()
 {
@@ -840,6 +891,10 @@ void loopHandler() {
     }
   #endif
 
+  #ifdef SENSOR_ML8511
+    loop_ML8511();
+  #endif
+
   #ifdef SENSOR_LDR
     loop_LDR();
   #endif
@@ -1014,8 +1069,21 @@ float getHumidity_HS1101(int pin) {
     return -1;
   }
 }
+#endif
+
+
+#ifdef SENSOR_ML8511
+float getUV_ML8511(int pin) {
+  float uvadc = 3.06 / 1023 * analogRead(pin) ; //assumes 1023 = 3.069V (10-bit adc on esp8266)
+  return max(mapfloat(uvadc, 0.99, 2.8, 0.0, 15.0), 0.0F);  //uvIntensity (mW/cm^2)
+}
+#endif
 
 
+/*##################################
+* ######## HELPER FUNCTIONS ########
+*/
+
 //quelle: https://groups.google.com/forum/#!topic/souliss/1kMAltPB2ME[1-25]
 int get_mapped(const unsigned int* _in, const unsigned int* _out, byte size,int val) //map with constrain
 { 
@@ -1035,4 +1103,10 @@ int get_mapped(const unsigned int* _in, const unsigned int* _out, byte size,int
  // interpolate in the right segment for the rest
  return map(val, _in[pos-1], _in[pos], _out[pos-1], _out[pos]);
 }
-#endif
+
+//The Arduino Map function but for floats
+//From: http://forum.arduino.cc/index.php?topic=3922.0
+float mapfloat(float x, float in_min, float in_max, float out_min, float out_max)
+{
+  return (x - in_min) * (out_max - out_min) / (in_max - in_min) + out_min;
+}