envisens/envisens_esp_fw/envisens_esp_fw.ino

@@ -115,10 +115,9 @@ bool forcePublish = false;
 
 bool publish (String desc, char *topic, float val, float &lastVal, float diff, bool force){
   bool retval = false;
-  Serial.println("Sample " + desc + ": " + String(val).c_str());
   if (checkVariation(val, lastVal, diff) or force) {
     lastVal = val;
-    Serial.println("Sufficient variation on " + desc + ": " + String(val).c_str());
+    Serial.println("New " + desc + ": " + String(val).c_str());
     if (checkPlausibility(val, lastVal, diff) or force) {
       Serial.println("Value published");
       client.publish(topic, String(val).c_str(), true);

espsens/espsens.ino

@@ -18,21 +18,10 @@
 #define TOPIC_TEMP TOPIC_BASE "temperature"
 #define TOPIC_HMID TOPIC_BASE "humidity"
 #define TOPIC_HEAT TOPIC_BASE "heat_index"
-#define TOPIC_ABHU TOPIC_BASE "abs_humidity"
 
 #define DIFF_TEMP 0.3 // sensor has only 0.5°C accuracy, triggering on less is ludicrous
 #define DIFF_HMID 2.5 // humidity doesn't change that much anyways
 #define DIFF_HEAT 0.2 // this one's actually quite active
-#define DIFF_ABHU 0.1 // small changes mean quite something
-
-float hmid = 0; // humidity
-float hmid_r = 0; // humidity
-float abhu = 0; // absolute humidity
-float abhu_r = 0; // absolute humidity
-float temp = 0; // temperature
-float temp_r = 0; // temperature
-float heat = 0; // heat index
-float heat_r = 0; // heat index
 
 #define DHTPIN 4     // Digital pin connected to the DHT sensor
 #define DHTTYPE DHT22   // DHT 22  (AM2302), AM2321
@@ -96,37 +85,30 @@ void reconnect() {
   }
 }
 
-bool checkVariation(float newValue, float prevValue, float maxDiff) {
+bool checkBound(float newValue, float prevValue, float maxDiff) {
   return !isnan(newValue) &&
          (newValue < prevValue - maxDiff || newValue > prevValue + maxDiff);
 }
 
-bool checkPlausibility(float newValue, float prevValue, float maxDiff) {
-  return (newValue < prevValue + (maxDiff * 10) || newValue > prevValue - (maxDiff * 10));
-}
-
 long lastMsg = 0;
+float t_r = 0.0;
+float h_r = 0.0;
+float hi_r = 0.0;
 long lastSent = 0; 
 bool published = false;
 bool forcePublish = false;
 
-bool publish (String desc, char *topic, float val, float &lastVal, float diff, bool force){
+bool publish (String desc, char *topic, float val, float &val_r, int diff, bool force){
-  bool retval = false;
+    if (checkBound(val, val_r, 0.3) or force) {
-  Serial.println("Sample " + desc + ": " + String(val).c_str());
+      val_r = val;
-  if (checkVariation(val, lastVal, diff) or force) {
+      Serial.print("New " + desc + ": ");
-    lastVal = val;
+      Serial.println(String(val).c_str());
-    Serial.println("Sufficient variation on " + desc + ": " + String(val).c_str());
-    if (checkPlausibility(val, lastVal, diff) or force) {
-      Serial.println("Value published");
       client.publish(topic, String(val).c_str(), true);
-      retval = true;
+      return true;
     } else {
-      Serial.print("** ERROR: Value out of bounds, not published. Last value :");
+      return false;
-      Serial.println(String(lastVal).c_str());
     }
 }
-  return retval;
-}
 
 void loop() {
   if (!client.connected()) {
@@ -143,14 +125,24 @@ void loop() {
     lastMsg = now;
     if (OPERATION_BLINK_EN) {digitalWrite(LED_BUILTIN, HIGH);}
 
-    hmid = dht.readHumidity();
+    float h = dht.readHumidity();
-    temp = dht.readTemperature();
+    float t = dht.readTemperature();
   
-    if (!isnan(hmid) && !isnan(temp)){
+    if (isnan(h) || isnan(t)) {
-      abhu = (6.112 * ( pow(2.71828, ((17.67 * temp) / (temp + 243.5))) * hmid * 2.1674)) / (273.15 + temp);
+      Serial.println(F("Failed to read from DHT sensor!"));
-      heat = dht.computeHeatIndex(temp, hmid, false);
+      return;
     }
  
+    float hi = dht.computeHeatIndex(t, h, false);
+
+    Serial.print(F("Humidity: "));
+    Serial.print(h);
+    Serial.print(F("%  Temperature: "));
+    Serial.print(t);
+    Serial.print(F("°C  Heat index: "));
+    Serial.print(hi);
+    Serial.println(F("°C "));
+
     published = false;
     if (lastSent > FORCE_PERIOD) {
       Serial.println(F("Forcing a publish of all values"));
@@ -158,10 +150,9 @@ void loop() {
       lastSent = 0;
     }
 
-    published += publish("temperature", TOPIC_TEMP, temp, temp_r, DIFF_TEMP, forcePublish);
+    published += publish("temperature", TOPIC_TEMP, t, t_r, DIFF_TEMP, forcePublish);
-    published += publish("humidity", TOPIC_HMID, hmid, hmid_r, DIFF_HMID, forcePublish);
+    published += publish("humidity", TOPIC_HMID, h, h_r, DIFF_HMID, forcePublish);
-    published += publish("heat index", TOPIC_HEAT, heat, heat_r, DIFF_HEAT, forcePublish);
+    published += publish("heat index", TOPIC_HEAT, hi, hi_r, DIFF_HEAT, forcePublish);
-    published += publish("absolute humidity", TOPIC_ABHU, abhu, abhu_r, DIFF_ABHU, forcePublish);    
     
     if (published == false) {
       lastSent = lastSent + 1;