diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.cpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.cpp
index b68972a..fc9f2cf 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.cpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.cpp
@@ -60,11 +60,13 @@ bool DigitalInputCard::begin()
     if (!this->inputBankA.begin())
     {
         ESP_LOGE("DigitalInputCard", "Input Card ERROR: Failed to install input bank A");
+        this->initOk = false;
         return false;
     }
     if (!this->inputBankB.begin())
     {
         ESP_LOGE("DigitalInputCard", "Input Card ERROR: Failed to install input bank B");
+        this->initOk = false;
         return false;
     }
     // Set the debounce time for all pins to 50ms
@@ -79,6 +81,7 @@ bool DigitalInputCard::begin()
         this->pinMap[i] = i;
         this->virtualPinMap[i] = i;
     }
+    this->initOk = true;
     return true;
 }
 
@@ -102,6 +105,11 @@ bool DigitalInputCard::digitalRead(uint8_t pin)
  */
 bool DigitalInputCard::digitalRead(uint8_t pin, bool refresh)
 {
+    if(!this->initOk)
+    {
+        ESP_LOGE("DigitalInputCard", "Input Card ERROR: Card not initialized");
+        return false;
+    }
     pin = pinMap[pin];
     // First check if the pin is in bank A or B
     if (pin >= 0 && pin <= 7)
@@ -120,7 +128,7 @@ bool DigitalInputCard::digitalRead(uint8_t pin, bool refresh)
         // Extract the bit from the buffer
         return ((inputBufferB >> (15 - pin)) & 1);
     }
-    return 255;
+    return false;
 }
 
 /**
@@ -291,6 +299,11 @@ uint8_t DigitalInputCard::registerCallback(std::function<void(uint8_t, bool)> ca
  */
 void DigitalInputCard::refreshInputBankA()
 {
+    if(!this->initOk)
+    {
+        ESP_LOGE("DigitalInputCard", "Input Card ERROR: Card not initialized");
+        return;
+    }
     inputBufferA = inputBankA.read8();
 }
 
@@ -299,6 +312,11 @@ void DigitalInputCard::refreshInputBankA()
  */
 void DigitalInputCard::refreshInputBankB()
 {
+    if(!this->initOk)
+    {
+        ESP_LOGE("DigitalInputCard", "Input Card ERROR: Card not initialized");
+        return;
+    }
     inputBufferB = inputBankB.read8();
 }
 
@@ -370,4 +388,14 @@ void DigitalInputCard::preloadInputBuffer()
     refreshInputBankB();
     previousInputBufferA = inputBufferA;
     previousInputBufferB = inputBufferB;
+}
+
+/**
+ * @brief Get the status of the card
+ *
+ * @return True if the card is initialized, false otherwise
+ */
+bool DigitalInputCard::getStatus()
+{
+    return this->initOk;
 }
\ No newline at end of file
diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.hpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.hpp
index f5587ba..d73f639 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.hpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputCard.hpp
@@ -43,9 +43,12 @@ class DigitalInputCard : public ExpansionCard {
         void loadPinMap(uint8_t pinMap[16]);
         // Preload previousInputBuffer and inputBuffer
         void preloadInputBuffer();
+        // Status of card
+        bool getStatus();
         // Get type of card
         uint8_t getType();
     private:
+        bool initOk = false;
         PCF8574 inputBankA;
         PCF8574 inputBankB;
         uint8_t address_a;
diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputIoT.cpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputIoT.cpp
index f138e52..ac1ba0c 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputIoT.cpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/DigitalInputIoT.cpp
@@ -17,6 +17,9 @@
  */
 bool DigitalInputIoT::begin(uint8_t card_id, ExpansionCard *card, PubSubClient *mqtt, char *base_topic) {
     this->card = (DigitalInputCard *)card;
+    if(!this->card->getStatus()) {
+        return false;
+    }
     this->card_id = card_id;
     this->mqtt = mqtt;
     this->base_topic = base_topic;
diff --git a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp
index 4107ba0..d0837f8 100644
--- a/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp
+++ b/ESPMegaPRO-OS-SDK/lib/ESPMegaPRO/ESPMegaIoT.cpp
@@ -144,6 +144,12 @@ void ESPMegaIoT::registerCard(uint8_t card_id)
     {
         return;
     }
+    // Check if the physical card is installed
+    if (cards[card_id] == NULL)
+    {
+        ESP_LOGE("ESPMegaIoT", "Registering card %d failed: Card not installed", card_id);
+        return;
+    }
     // Get the card type
     uint8_t card_type = cards[card_id]->getType();
     // Create the respective IoT component
diff --git a/ESPMegaPRO-OS-SDK/src/main.cpp b/ESPMegaPRO-OS-SDK/src/main.cpp
index 7385028..62e7079 100644
--- a/ESPMegaPRO-OS-SDK/src/main.cpp
+++ b/ESPMegaPRO-OS-SDK/src/main.cpp
@@ -42,7 +42,7 @@ void handleExternalDigitalInput(uint8_t pin, uint8_t state)
     Serial.printf("Digital Input External %d: %d\n", pin, state);
 }
 
-DigitalInputCard externalDigitalInputCard = DigitalInputCard(1, 0, 1, 1, 1, 0);
+DigitalInputCard externalDigitalInputCard = DigitalInputCard(0, 0, 1, 0, 1, 1);
 #endif
 
 // Remote Variable
@@ -231,8 +231,8 @@ void setup()
     espmega.iot->registerCard(6);
 #endif
 #ifdef EXTERNAL_DIGITAL_INPUT_CARD_ENABLE
-    // ESP_LOGI("Initializer", "Registering cards 7");
-    // espmega.iot->registerCard(7);
+    ESP_LOGI("Initializer", "Registering cards 7");
+    espmega.iot->registerCard(7);
 #endif
 #endif
     ESP_LOGI("Initializer", "Registering Input change callback");