Many changes.

1. Migrate from microDS18B20 to DallasTemperature
2. Refactoring of sensors: added an external temperature sensor inside the house, added an "offset" parameter for sensors
3. Fixed PID
4. New parameters added:
- settings.heating.minTemp
- settings.heating.maxTemp
- settings.dhw.minTemp
- settings.dhw.maxTemp
- settings.pid.minTemp
- settings.pid.maxTemp
- settings.sensors.outdoor.type
- settings.sensors.outdoor.pin
- settings.sensors.outdoor.offset
- settings.sensors.indoor.type
- settings.sensors.indoor.pin
- settings.sensors.indoor.offset
5. Fixed and updated HomeAssistantHelper
7. Added check for validity of settings. After some updates, the settings may be reset to default, but this will prevent the settings from being distorted.

src/Settings.h

@@ -1,12 +1,10 @@
 struct Settings {
   bool debug = false;
-  // 0 - boiler, 1 - manual, 2 - ds18b20
-  byte outdoorTempSource = 0;
   char hostname[80] = "opentherm";
 
   struct {
-    byte inPin = 5;
-    byte outPin = 4;
+    byte inPin = 4;
+    byte outPin = 5;
     unsigned int memberIdCode = 0;
   } opentherm;
 
@@ -30,11 +28,15 @@ struct Settings {
     bool turbo = false;
     float target = 40.0f;
     float hysteresis = 0.5f;
+    byte minTemp = 20.0f;
+    byte maxTemp = 90.0f;
   } heating;
 
   struct {
     bool enable = true;
     byte target = 40;
+    byte minTemp = 30.0f;
+    byte maxTemp = 60.0f;
   } dhw;
 
   struct {
@@ -42,6 +44,8 @@ struct Settings {
     float p_factor = 3;
     float i_factor = 0.2f;
     float d_factor = 0;
+    byte minTemp = 0.0f;
+    byte maxTemp = 90.0f;
   } pid;
 
   struct {
@@ -51,6 +55,23 @@ struct Settings {
     float t_factor = 2.0f;
   } equitherm;
 
+  struct {
+    struct {
+      // 0 - boiler, 1 - manual, 2 - ds18b20
+      byte type = 0;
+      byte pin = 12;
+      float offset = 0.0f;
+    } outdoor;
+
+    struct {
+      // 1 - manual, 2 - ds18b20
+      byte type = 1;
+      byte pin = 14;
+      float offset = 0.0f;
+    } indoor;
+  } sensors;
+
+  char validationValue[8] = SETTINGS_VALID_VALUE;
 } settings;
 
 struct Variables {
@@ -84,11 +105,11 @@ struct Variables {
   } temperatures;
 
   struct {
-    byte heatingMinTemp = 20;
-    byte heatingMaxTemp = 90;
+    byte heatingMinTemp = 0;
+    byte heatingMaxTemp = 0;
     byte heatingSetpoint = 0.0f;
-    byte dhwMinTemp = 30;
-    byte dhwMaxTemp = 60;
+    byte dhwMinTemp = 0;
+    byte dhwMaxTemp = 0;
     uint8_t slaveMemberIdCode;
     uint8_t slaveType;
     uint8_t slaveVersion;