diff --git a/platformio.ini b/platformio.ini
index 58915b68..69d42cb9 100644
--- a/platformio.ini
+++ b/platformio.ini
@@ -6,7 +6,7 @@
 
 ; ---> SELECT TARGET PLATFORM HERE! <---
 [platformio]
-env_default = generic
+;env_default = generic
 ;env_default = ebox
 ;env_default = eboxtube
 ;env_default = heltec
@@ -15,7 +15,7 @@ env_default = generic
 ;env_default = ttgov2
 ;env_default = ttgov21old
 ;env_default = ttgov21new
-;env_default = ttgobeam
+env_default = ttgobeam
 ;env_default = lopy
 ;env_default = lopy4
 ;env_default = fipy
diff --git a/src/hal/generic.h b/src/hal/generic.h
index ba328c3e..ad88536f 100644
--- a/src/hal/generic.h
+++ b/src/hal/generic.h
@@ -17,6 +17,7 @@
 
 // enable only if device has these sensors, otherwise comment these lines
 // BME680 sensor on I2C bus
+// don't forget to connect SDIO of BME680 to GND for selecting i2c addr 0x76
 #define HAS_BME GPIO_NUM_21, GPIO_NUM_22 // SDA, SCL
 
 // user defined sensors
diff --git a/src/hal/octopus32.h b/src/hal/octopus32.h
index 8e67d643..6d8ffdc0 100644
--- a/src/hal/octopus32.h
+++ b/src/hal/octopus32.h
@@ -14,6 +14,7 @@
 
 // enable only if device has these sensors, otherwise comment these lines
 // BME680 sensor on I2C bus
+// don't forget to connect SDIO of BME680 to GND for selecting i2c addr 0x76
 #define HAS_BME GPIO_NUM_21, GPIO_NUM_22 // SDA, SCL
 
 // user defined sensors
diff --git a/src/hal/ttgobeam.h b/src/hal/ttgobeam.h
index 93c024ce..8691c79f 100644
--- a/src/hal/ttgobeam.h
+++ b/src/hal/ttgobeam.h
@@ -9,7 +9,10 @@
 
 // enable only if device has these sensors, otherwise comment these lines
 // BME680 sensor on I2C bus
+// attention: Pin21 is also LED! set HAS_LED to NOT_A_PIN if using BME280
+// don't forget to connect SDIO of BME680 to GND for selecting i2c addr 0x76
 #define HAS_BME GPIO_NUM_21, GPIO_NUM_22 // SDA, SCL
+#define HAS_LED NOT_A_PIN // on board green LED
 
 // user defined sensors
 //#define HAS_SENSORS 1 // comment out if device has user defined sensors
@@ -18,7 +21,7 @@
 #define CFG_sx1276_radio 1 // HPD13A LoRa SoC
 
 #define BOARD_HAS_PSRAM // use extra 4MB external RAM
-#define HAS_LED GPIO_NUM_21 // on board green LED
+//#define HAS_LED GPIO_NUM_21 // on board green LED
 
 #define HAS_BUTTON GPIO_NUM_39 // on board button "BOOT" (next to reset button)
 
diff --git a/src/led.cpp b/src/led.cpp
index f8fb596a..8a90f9ec 100644
--- a/src/led.cpp
+++ b/src/led.cpp
@@ -107,15 +107,17 @@ void switch_LED(uint8_t state) {
 #endif
 }
 
-#if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
-
 void blink_LED(uint16_t set_color, uint16_t set_blinkduration) {
+#if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
   LEDColor = set_color;                 // set color for RGB LED
   LEDBlinkDuration = set_blinkduration; // duration
   LEDBlinkStarted = millis();           // Time Start here
   LEDState = LED_ON;                    // Let main set LED on
+#endif
 }
 
+#if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)
+
 void ledLoop(void *parameter) {
   while (1) {
     // Custom blink running always have priority other LoRaWAN led
@@ -189,8 +191,8 @@ void ledLoop(void *parameter) {
     }
     // give yield to CPU
     vTaskDelay(2 / portTICK_PERIOD_MS);
-  }                  // while(1)
+  }                         // while(1)
   vTaskDelete(ledLoopTask); // shoud never be reached
-};                   // ledloop()
+};                          // ledloop()
 
 #endif // #if (HAS_LED != NOT_A_PIN) || defined(HAS_RGB_LED)