added update on change to ds18b20 temperature sensor with default 1.0 degrees change. Saves space on MQTT server as it avoids logging pointless points..

code/espurna/config/sensors.h

@@ -74,12 +74,14 @@
 //--------------------------------------------------------------------------------
 
 #ifndef DS18B20_SUPPORT
-#define DS18B20_SUPPORT             0
+#define DS18B20_SUPPORT             1
 #endif
 
-#define DS18B20_PIN                 14
-#define DS18B20_UPDATE_INTERVAL     60000
+#define DS18B20_PIN                 2
+#define DS18B20_UPDATE_INTERVAL     5000
 #define DS18B20_TEMPERATURE_TOPIC   "temperature"
+//Will only send MQTT update if the value has changed by this amount (0.0 sends every interval)
+#define DS18B20_UPDATE_ON_CHANGE    1.0 
 
 //--------------------------------------------------------------------------------
 // Internal power montior

code/espurna/ds18b20.ino

@@ -51,6 +51,10 @@ void dsLoop() {
     // Check if we should read new data
     static unsigned long last_update = 0;
     static bool requested = false;
+
+    static double last_temperature = 0.0;
+    bool send_update = false;
+
     if ((millis() - last_update > DS18B20_UPDATE_INTERVAL) || (last_update == 0)) {
         if (!requested) {
             ds18b20.requestTemperatures();
@@ -80,6 +84,12 @@ void dsLoop() {
             DEBUG_MSG_P(PSTR("[DS18B20] Error reading sensor\n"));
 
         } else {
+            
+            //If the new temperature is different from the last
+            if (fabs(t - last_temperature) >= DS18B20_UPDATE_ON_CHANGE) {
+                last_temperature = t;
+                send_update = true;
+            }
 
             _dsTemperature = t;
 
@@ -95,25 +105,26 @@ void dsLoop() {
                 getDSTemperatureStr(),
 			    (_dsIsConnected ? ((tmpUnits == TMP_CELSIUS) ? "ºC" : "ºF") : ""));
 
-            // Send MQTT messages
-            mqttSend(getSetting("dsTmpTopic", DS18B20_TEMPERATURE_TOPIC).c_str(), _dsTemperatureStr);
-
-            // Send to Domoticz
-            #if DOMOTICZ_SUPPORT
-                domoticzSend("dczTmpIdx", 0, _dsTemperatureStr);
-            #endif
-
-            #if INFLUXDB_SUPPORT
-                influxDBSend(getSetting("dsTmpTopic", DS18B20_TEMPERATURE_TOPIC).c_str(), _dsTemperatureStr);
-            #endif
-
-            // Update websocket clients
-            #if WEB_SUPPORT
-                char buffer[100];
-                snprintf_P(buffer, sizeof(buffer), PSTR("{\"dsVisible\": 1, \"dsTmp\": %s, \"tmpUnits\": %d}"), getDSTemperatureStr(), tmpUnits);
-                wsSend(buffer);
-            #endif
-
+            if (send_update) {
+                // Send MQTT messages
+                mqttSend(getSetting("dsTmpTopic", DS18B20_TEMPERATURE_TOPIC).c_str(), _dsTemperatureStr);
+
+                // Send to Domoticz
+                #if DOMOTICZ_SUPPORT
+                    domoticzSend("dczTmpIdx", 0, _dsTemperatureStr);
+                #endif
+
+                #if INFLUXDB_SUPPORT
+                    influxDBSend(getSetting("dsTmpTopic", DS18B20_TEMPERATURE_TOPIC).c_str(), _dsTemperatureStr);
+                #endif
+
+                // Update websocket clients
+                #if WEB_SUPPORT
+                    char buffer[100];
+                    snprintf_P(buffer, sizeof(buffer), PSTR("{\"dsVisible\": 1, \"dsTmp\": %s, \"tmpUnits\": %d}"), getDSTemperatureStr(), tmpUnits);
+                    wsSend(buffer);
+                #endif
+            }
         }
 
     }

code/espurna/espurna.ino

@@ -43,7 +43,7 @@ void hardwareSetup() {
         SPIFFS.begin();
     #endif
 
-    #if defined(EPSLIVE)
+    #if defined(ESPLIVE)
         //The ESPLive has an ADC MUX which needs to be configured.
         pinMode(16, OUTPUT);
         digitalWrite(16, HIGH); //Defualt CT input (pin B, solder jumper B)

code/platformio.ini

@@ -889,22 +889,21 @@ monitor_baud = 115200
 [env:esplive]
 platform = espressif8266
 framework = arduino
-board = nodemcuv2
-board_flash_mode = dout
+board = d1_mini
 lib_deps = ${common.lib_deps}
 lib_ignore = ${common.lib_ignore}
-build_flags = ${common.build_flags_1m} -DESPLIVE
+build_flags = ${common.build_flags} -DESPLIVE
+upload_speed = 460800
 monitor_baud = 115200
 
 [env:esplive-ota]
 platform = espressif8266
 framework = arduino
-board = nodemcuv2
-board_flash_mode = dout
+board = d1_mini
 lib_deps = ${common.lib_deps}
 lib_ignore = ${common.lib_ignore}
-build_flags = ${common.build_flags_1m} -DESPLIVE
-upload_speed = 115200
+build_flags = ${common.build_flags} -DESPLIVE
+upload_speed = 460800
 upload_port = "192.168.4.1"
 upload_flags = --auth=fibonacci --port 8266
 monitor_baud = 115200