Добавил минимальное логирование

lab3/src/main/java/ru/spbstu/telematics/java/App.java

@@ -1,7 +1,11 @@
 package ru.spbstu.telematics.java;
 
+import java.util.Locale;
+
 public class App {
     public static void main(String[] args) {
+        Locale.setDefault(Locale.ENGLISH);
+
         Room room = new Room();
         Settings settings = new Settings(28, 0.4);
         Controller controller = new Controller(room, settings);

lab3/src/main/java/ru/spbstu/telematics/java/Controller.java

@@ -7,6 +7,7 @@ package ru.spbstu.telematics.java;
  * комнаты напрямую.
  */
 public class Controller implements Runnable {
+    private Room room;
     private Settings settings;
     private Sensor sensor;
     private Thread sensorThread;
@@ -16,6 +17,7 @@ public class Controller implements Runnable {
     private Thread fanThread;
 
     public Controller(Room room, Settings settings) {
+        this.room = room;
         this.settings = settings;
 
         sensor = new Sensor(room);
@@ -31,24 +33,58 @@ public class Controller implements Runnable {
     private long updateIntervalMs = 500;
     private double tolerance = 0.01;
 
+    private void log(String string) {
+        System.out.printf("[Controller in room %s] %s\n", room.name, string);
+    }
+
     @Override
     public void run() {
         sensorThread.start();
         heaterThread.start();
         fanThread.start();
+        log("Started sensor, heater and fan threads");
 
         while (!Thread.interrupted()) {
-            if (sensor.getTemperature() < settings.getTemperature() * (1 - tolerance)) {
+            double currentTemperature = sensor.getTemperature();
+            double desiredTemperature = settings.getTemperature();
+
+            if (currentTemperature < desiredTemperature * (1 - tolerance)) {
+                if (!heater.isOn()) {
+                    log(String.format(
+                            "Turning heater ON (current - %.2fC°, desired %.2fC°)",
+                            currentTemperature,
+                            desiredTemperature));
                     heater.turnOn();
+                }
             } else {
+                if (heater.isOn()) {
+                    log(String.format(
+                            "Turning heater OFF (current - %.2fC°, desired %.2fC°)",
+                            currentTemperature,
+                            desiredTemperature));
                     heater.turnOff();
                 }
+            }
 
-            if (sensor.getHumidity() > settings.getHumidity() * (1 + tolerance)) {
+            double currentHumidity = sensor.getHumidity();
+            double desiredHumidity = settings.getHumidity();
+            if (currentHumidity > desiredHumidity * (1 + tolerance)) {
+                if (!fan.isOn()) {
+                    log(String.format(
+                            "Turning fan ON (current - %.2f%%, desired %.2f%%)",
+                            currentHumidity * 100,
+                            desiredHumidity * 100));
                     fan.turnOn();
+                }
             } else {
+                if (fan.isOn()) {
+                    log(String.format(
+                            "Turning fan OFF (current - %.2f%%, desired %.2f%%)",
+                            currentHumidity * 100,
+                            desiredHumidity * 100));
                     fan.turnOff();
                 }
+            }
 
             Utils.sleep(updateIntervalMs);
         }

lab3/src/main/java/ru/spbstu/telematics/java/Fan.java

@@ -15,6 +15,10 @@ public class Fan implements Runnable {
 
     private volatile boolean isOn;
 
+    public boolean isOn() {
+        return isOn;
+    }
+
     public void turnOn() {
         this.isOn = true;
     }

lab3/src/main/java/ru/spbstu/telematics/java/Heater.java

@@ -15,6 +15,10 @@ public class Heater implements Runnable {
 
     private volatile boolean isOn;
 
+    public boolean isOn() {
+        return isOn;
+    }
+
     public void turnOn() {
         this.isOn = true;
     }

lab3/src/main/java/ru/spbstu/telematics/java/Room.java

@@ -6,6 +6,15 @@ import java.util.Random;
  * Симулирует физические процессы, протекающие в команте.
  */
 public class Room implements Runnable {
+    static private int roomCounter;
+
+    public final String name;
+
+    public Room() {
+        roomCounter++;
+        this.name = "#" + roomCounter;
+    }
+
     // Температура измеряется в градусах цельсия
     private volatile double temperature = 24.0;