diff --git a/main/main.c b/main/main.c
index c50ef50..36f10f7 100644
--- a/main/main.c
+++ b/main/main.c
@@ -23,6 +23,7 @@
 #include "main.h"
 
 #define MASTER_MODE_PIN GPIO_NUM_23 // Jumper-Erkennungspin
+#define MASTER_UART UART_NUM_2
 #define BROADCAST_INTERVAL_MS 500
 
 #define BUF_SIZE (1024)
@@ -372,11 +373,11 @@ void uart_read_task(void *param) {
   while (1) {
     len = 0;
     len =
-        uart_read_bytes(UART_NUM_2, data, BUF_SIZE, (20 / portTICK_PERIOD_MS));
+        uart_read_bytes(MASTER_UART, data, BUF_SIZE, (20 / portTICK_PERIOD_MS));
     if (len > 0) {
       data[len] = '\0';
       ESP_LOGI(TAG, "GOT UART DATA %s", data);
-      uart_write_bytes(UART_NUM_2, data, len);
+      uart_write_bytes(MASTER_UART, data, len);
     }
   }
 }
@@ -388,9 +389,9 @@ void init_uart() {
                                .stop_bits = UART_STOP_BITS_1,
                                .flow_ctrl = UART_HW_FLOWCTRL_DISABLE};
 
-  uart_driver_install(UART_NUM_2, BUF_SIZE * 2, 0, 0, NULL, 0);
-  uart_param_config(UART_NUM_2, &uart_config);
-  uart_set_pin(UART_NUM_2, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE,
+  uart_driver_install(MASTER_UART, BUF_SIZE * 2, 0, 0, NULL, 0);
+  uart_param_config(MASTER_UART, &uart_config);
+  uart_set_pin(MASTER_UART, TXD_PIN, RXD_PIN, UART_PIN_NO_CHANGE,
                UART_PIN_NO_CHANGE);
   xTaskCreate(uart_read_task, "Read Uart", 4096, NULL, 1, NULL);
 }
@@ -405,7 +406,7 @@ void app_main(void) {
   ESP_ERROR_CHECK(ret);
 
   // GPIO-Pin für Moduserkennung
-  gpio_reset_pin(Master_SlavePin);
+  gpio_reset_pin(MASTER_MODE_PIN);
   gpio_set_direction(MASTER_MODE_PIN, GPIO_MODE_INPUT);
   bool isMaster = (gpio_get_level(MASTER_MODE_PIN) == 0);
 
diff --git a/main/main.h b/main/main.h
index 4ce7670..ebfa484 100644
--- a/main/main.h
+++ b/main/main.h
@@ -1,6 +1,4 @@
 #ifndef MAIN_H
 #define MAIN_H
 
-#define Master_SlavePin 23
-
 #endif