diff --git a/gbmanager.cpp b/gbmanager.cpp
index 90b85d4..56d99ca 100644
--- a/gbmanager.cpp
+++ b/gbmanager.cpp
@@ -5,6 +5,7 @@
 #include "hardware/i2c.h"
 #include "pico/stdlib.h"
 
+#include "config.h"
 #include "ds18b20.h"
 #include "lcd.h"
 
@@ -28,21 +29,38 @@ int main() {
 
     float temp_act{0};
     float temp_tgt{28.0};
+    float temp_diff{0.5};
     std::stringstream lcdText{};
     bool isHeating = false;
+    bool isSystemOn = false;
     string heatInfo{"   "};
     string systemInfo{"OFF"};
 
+    lcdText << " G" << CUSTOM_CHAR_AE << "rbox Manager\n (Ver. "
+            << PROJECT_VERSION << ")";
+    myLCD.sendString(lcdText.str());
+    sleep_ms(3000);
+
     while (true) {
         // ds.convert();
         sleep_ms(750);
         // temp_act = ds.getTemperature();
         temp_act = 23.5;
 
+        if (isSystemOn && temp_act < temp_tgt - temp_diff) {
+            isHeating = true;
+        } else if (isSystemOn && temp_act > temp_tgt + temp_diff) {
+            isHeating = false;
+        } else if (!isSystemOn) {
+            isHeating = false;
+        }
+        isHeating ? heatInfo = ">H<" : heatInfo = "   ";
+
         lcdText.str("");
         lcdText.clear();
         lcdText.precision(4);
-        lcdText << "ACT: " << temp_act << CUSTOM_CHAR_DEG << "C " << heatInfo << "\n"
+        lcdText << "ACT: " << temp_act << CUSTOM_CHAR_DEG << "C " << heatInfo
+                << "\n"
                 << "TGT: " << temp_tgt << CUSTOM_CHAR_DEG << "C " << systemInfo;
 
         myLCD.setCursor(0, 0);