diff --git a/platformio.ini b/platformio.ini
index d2c63d7..10d4314 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -12,6 +12,5 @@
 platform = espressif32
 board = wt32-eth01
 framework = arduino
-lib_deps = siwats/ESPMegaPROR3@^2.0.7
+lib_deps = siwats/ESPMegaPROR3@^2.2.3
 monitor_speed = 115200
-;build_flags = -DCORE_DEBUG_LEVEL=5
\ No newline at end of file
diff --git a/src/ise_display.cpp b/src/ise_display.cpp
index 9387901..9dc3fac 100644
--- a/src/ise_display.cpp
+++ b/src/ise_display.cpp
@@ -1,5 +1,5 @@
 #include <ise_display.hpp>
-ISEDisplay::ISEDisplay(HardwareSerial *adapter) : ESPMegaDisplay(adapter)
+ISEDisplay::ISEDisplay(HardwareSerial *adapter) : ESPMegaDisplay(adapter, 115200, 912600, 4, 17)
 {
 }
 //  sat->sun
@@ -254,21 +254,41 @@ void ISEDisplay::handlePWMChange(uint8_t pin, bool state, uint16_t value)
 {
     // NEED to switch case for different page
 
-    // Question: can add another input and placeholder for page differentation
-    // or that would mean changing the data structure of the callback
-
-    if (pin >= 1 && pin <= 4)
+    uint8_t current_page = this->currentPage;
+    if (current_page == PAGE_STANDBY)
     {
-        // Light
-        updateLightGroupStatePageDashboard();
-        updateLightGroupStatePageStandby();
-        time_since_last_screen_update = millis(); // update time since last activity
+        if (pin >= 1 && pin <= 4)
+        {
+            // Light
+            updateLightGroupStatePageDashboard();
+            updateLightGroupStatePageStandby();
+            time_since_last_screen_update = millis(); // update time since last activity
+        }
+        else if (pin == 4 || pin == 5)
+        {
+            // Air Purifier
+            updateAirPurifierState();
+            time_since_last_screen_update = millis(); // update time since last activity
+        }
     }
-    else if (pin == 4 || pin == 5)
+    else if (current_page == PAGE_DASHBOARD)
     {
-        // Air Purifier
-        updateAirPurifierState();
-        time_since_last_screen_update = millis(); // update time since last activity
+        if (pin >= 1 && pin <= 4)
+        {
+            // Light
+            updateLightGroupStatePageStandby();
+            time_since_last_screen_update = millis(); // update time since last activity
+        }
+        else if (pin == 4 || pin == 5)
+        {
+            // Air Purifier
+            updateAirPurifierState();
+            time_since_last_screen_update = millis(); // update time since last activity
+        }
+    }
+    else
+    {
+        return;
     }
 }
 void ISEDisplay::updateDateTimeText(rtctime_t time)
@@ -295,16 +315,21 @@ void ISEDisplay::updateDateTimeText(rtctime_t time)
 // appdeamon
 void ISEDisplay::updateWeather(uint8_t weather_code, float outside_temp)
 {
+
 }
 void ISEDisplay::updatePMoutside(float pm25_outside)
 {
+    // TODO : use remotevar to get data from appdaemon and update the display
+
 }
 void ISEDisplay::updatePMinside(float pm25_inside)
 {
+    // TODO : get data from HA's Xiaomi air purifier sensor
 }
 
 void ISEDisplay::setPMstate(bool is_pm_on, uint8_t pm_fan_speed)
 {
+    // TODO : set data to HA's Xiaomi air purifier sensor
 }
 
 void ISEDisplay::setACstate(uint8_t ac_fan_speed, uint8_t ac_mode, uint8_t ac_temperature)
@@ -364,8 +389,8 @@ void ISEDisplay::changeUserACmode()
     }
     else
     { // ie mode is off
-        // do nothing as the state is keep in user_mode
-        //  the mode will change to user_mode when turn on by toggleAC()
+      // do nothing as the state is keep in user_mode
+      //  the mode will change to user_mode when turn on by toggleAC()
     }
     updateuserACmode(); // call to update mode part of the display seperately
 }
diff --git a/src/ise_display.hpp b/src/ise_display.hpp
index 001595a..a42b9be 100644
--- a/src/ise_display.hpp
+++ b/src/ise_display.hpp
@@ -6,6 +6,7 @@
 #include <DigitalInputCard.hpp>
 #include <DigitalOutputCard.hpp>
 #include <ClimateCard.hpp>
+#include <RemoteVariable.hpp>
 
 /**
  * @brief A class for controlling the ESPMegaDisplay.
diff --git a/src/main.cpp b/src/main.cpp
index c606cf9..e1015f4 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,5 +1,6 @@
 #include <main.hpp>
 
+RemoteVariable pm25_out = RemoteVariable();
 
 const char *mode_names[] = {"off", "fan_only", "cool"};
 const char *fan_speed_names[] = {"auto", "high", "medium", "low"};
@@ -101,6 +102,12 @@ void setup()
   auto bindedGetTime = std::bind(&ESPMegaPRO::getTime, &espmega);
   iseDisplay.begin(&espmega.inputs, &espmega.outputs, &climateCard);
   espmega.iot->registerRelativeMqttCallback(&handleMqttMessage);
+
+  // placeholder
+  // PM2.5 PPM Remote Variable
+  // 12 bytes remote variable, 11 characters + null terminator
+  // Enable value request at /iqair/pm25_request
+  pm25_out.begin(12, "/iqair/pm25_ppm", espmega.iot, true, "/iqair/pm25_request");
 }
 
 void loop()
@@ -121,4 +128,12 @@ void loop()
 void on_pin_change(uint8_t pin, uint8_t value)
 {
 
+}
+
+uint16_t get_pm25_out()
+{
+  uint16_t pm25_out_value = 0;
+  // Read PM2.5 PPM from sensor
+  pm25_out_value = atoi(pm25_out.getValue());
+  return pm25_out_value;
 }
\ No newline at end of file
diff --git a/src/main.hpp b/src/main.hpp
index 036c50b..9859eca 100644
--- a/src/main.hpp
+++ b/src/main.hpp
@@ -29,4 +29,6 @@ void sendExtStopBytes();
 void setup();
 void loop();
 
-void on_pin_change(uint8_t pin, uint8_t value);
\ No newline at end of file
+void on_pin_change(uint8_t pin, uint8_t value);
+
+uint16_t get_pm25_out();
\ No newline at end of file