diff --git a/README.md b/README.md
index 0b286b7..9d7e6ef 100644
--- a/README.md
+++ b/README.md
@@ -15,7 +15,7 @@
 
 1. Enable interrupt support only if input GPIO's are used.
 2. All the INT GPIO's on the extenders must be connected to the one GPIO on ESP.
-3. The input GPIO's are always pullup to the power supply. They must be connected to ground to trigger an interrupt.
+3. The input GPIO's are always pullup to the power supply.
 
 ## Dependencies
 
@@ -133,6 +133,6 @@ void app_main(void)
 void zh_pcf8574_event_handler(void *arg, esp_event_base_t event_base, int32_t event_id, void *event_data) // Required only if used input GPIO interrupts.
 {
     zh_pcf8574_event_on_isr_t *event = event_data;
-    printf("Interrupt happened on device address 0x%02X on GPIO number %d.\n", event->i2c_address, event->gpio_number);
+    printf("Interrupt happened on device address 0x%02X on GPIO number %d at level %d.\n", event->i2c_address, event->gpio_number, event->gpio_level);
 }
 ```
diff --git a/include/zh_pcf8574.h b/include/zh_pcf8574.h
index 30e31f8..577b78d 100644
--- a/include/zh_pcf8574.h
+++ b/include/zh_pcf8574.h
@@ -73,6 +73,7 @@ extern "C"
     {
         uint8_t i2c_address; // The i2c address of PCF8574 expander that caused the interrupt.
         uint8_t gpio_number; // The GPIO that caused the interrupt.
+        bool gpio_level;     // The GPIO level that caused the interrupt.
     } zh_pcf8574_event_on_isr_t;
 
     /**
diff --git a/version.txt b/version.txt
index 867e524..589268e 100644
--- a/version.txt
+++ b/version.txt
@@ -1 +1 @@
-1.2.0
\ No newline at end of file
+1.3.0
\ No newline at end of file
diff --git a/zh_pcf8574.c b/zh_pcf8574.c
index 69254cf..3c01974 100644
--- a/zh_pcf8574.c
+++ b/zh_pcf8574.c
@@ -223,8 +223,9 @@ static void IRAM_ATTR _zh_pcf8574_isr_processing_task(void *pvParameter)
             zh_pcf8574_event_on_isr_t event = {0};
             event.i2c_address = handle->i2c_address;
             event.gpio_number = 0xFF;
-            uint8_t reg_temp = 0;
-            esp_err_t err = _zh_pcf8574_read_register(handle, &reg_temp);
+            uint8_t old_reg = handle->gpio_status;
+            uint8_t new_reg = 0;
+            esp_err_t err = _zh_pcf8574_read_register(handle, &new_reg);
             if (err != ESP_OK)
             {
                 ZH_PCF8574_LOGE_ERR("PCF8574 isr processing failed. Failed to read expander register.", err);
@@ -232,9 +233,13 @@ static void IRAM_ATTR _zh_pcf8574_isr_processing_task(void *pvParameter)
             }
             for (uint8_t j = 0; j <= 7; ++j)
             {
-                if (((handle->gpio_work_mode & _gpio_matrix[j]) != 0) && ((reg_temp & _gpio_matrix[j]) == 0))
+                if ((handle->gpio_work_mode & _gpio_matrix[j]) != 0)
                 {
-                    event.gpio_number = j;
+                    if ((old_reg & _gpio_matrix[j]) != (new_reg & _gpio_matrix[j]))
+                    {
+                        event.gpio_number = j;
+                        event.gpio_level = new_reg & _gpio_matrix[j];
+                    }
                     break;
                 }
             }