diff --git a/.gitignore b/.gitignore
index a535321a..030b6f3d 100644
--- a/.gitignore
+++ b/.gitignore
@@ -5,8 +5,8 @@
 .vscode/c_cpp_properties.json
 .vscode/settings.json
 .vscode/launch.json
-src/loraconf.h
 .vscode/*.db
 .vscode/.browse.c_cpp.db*
 .clang_complete
 .gcc-flags.json
+src/loraconf.h
diff --git a/src/hal/heltec.h b/src/hal/heltec.h
index a860df50..2671fac8 100644
--- a/src/hal/heltec.h
+++ b/src/hal/heltec.h
@@ -5,7 +5,6 @@
 #define CFG_sx1276_radio 1
 
 #define HAS_DISPLAY U8X8_SSD1306_128X64_NONAME_HW_I2C // OLED-Display on board
-//#define DISPLAY_FLIP  1 // uncomment this for rotated display
 #define HAS_LED GPIO_NUM_25 // white LED on board
 #define HAS_BUTTON GPIO_NUM_0 // button "PROG" on board
 
diff --git a/src/hal/ttgov21.h b/src/hal/ttgov21.h
index 06cda59f..f5c4b760 100644
--- a/src/hal/ttgov21.h
+++ b/src/hal/ttgov21.h
@@ -1,18 +1,49 @@
 /*  Hardware related definitions for TTGO V2.1 Board
 / ATTENTION: check your board version!
 / Different versions are on the market which need different settings in this file:
-/ - without label        -> "old"
-/ - labelled v1.5 on pcb -> "old"
-/ - labelled v1.6 on pcb -> "new"
+/ - without label       -> use settings (2)
+/ - labeled V1.5 on pcb -> use settings (2) 
+/ - labeled V1.6 on pcb -> use settings (1)
+/ Choose the right configuration below
 */
 
+// (1) settings for board labeled "T3_V1.6" on pcb
+
+#define HAS_LORA 1       // comment out if device shall not send data via LoRa
+#define HAS_SPI 1        // comment out if device shall not send data via SPI
+#define CFG_sx1276_radio 1 // HPD13A LoRa SoC
+
+#define HAS_DISPLAY U8X8_SSD1306_128X64_NONAME_HW_I2C
+#define HAS_LED GPIO_NUM_25 // green on board LED
+#define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL // uses GPIO7
+#define BATT_FACTOR 2 // voltage divider 100k/100k on board
+
+// re-define pin definitions of pins_arduino.h
+#define PIN_SPI_SS    GPIO_NUM_18 // ESP32 GPIO18 (Pin18) -- HPD13A NSS/SEL (Pin4) SPI Chip Select Input
+#define PIN_SPI_MOSI  GPIO_NUM_27 // ESP32 GPIO27 (Pin27) -- HPD13A MOSI/DSI (Pin6) SPI Data Input
+#define PIN_SPI_MISO  GPIO_NUM_19 // ESP32 GPIO19 (Pin19) -- HPD13A MISO/DSO (Pin7) SPI Data Output
+#define PIN_SPI_SCK   GPIO_NUM_5  // ESP32 GPIO5 (Pin5)   -- HPD13A SCK (Pin5) SPI Clock Input
+
+// non arduino pin definitions
+#define RST   GPIO_NUM_23 // ESP32 GPIO23 <-> HPD13A RESET
+#define DIO0  GPIO_NUM_26 // ESP32 GPIO26 <-> HPD13A IO0
+#define DIO1  GPIO_NUM_33 // ESP32 GPIO33 <-> HPDIO1 <-> HPD13A IO1
+#define DIO2  GPIO_NUM_32 // ESP32 GPIO32 <-> HPDIO2 <-> HPD13A IO2
+
+// Hardware pin definitions for TTGO V2 Board with OLED SSD1306 0,96" I2C Display
+#define OLED_RST U8X8_PIN_NONE // connected to CPU RST/EN
+#define OLED_SDA GPIO_NUM_21 // ESP32 GPIO21 -- SD1306 D1+D2
+#define OLED_SCL GPIO_NUM_22 // ESP32 GPIO22 -- SD1306 D0
+
+/*
+// (2) settings for boards without label on pcb, or labeled v1.5 on pcb
+
 #define HAS_LORA 1       // comment out if device shall not send data via LoRa
 #define HAS_SPI 1        // comment out if device shall not send data via SPI
 #define CFG_sx1276_radio 1 // HPD13A LoRa SoC
 
 #define HAS_DISPLAY U8X8_SSD1306_128X64_NONAME_HW_I2C
 #define DISPLAY_FLIP  1 // rotated display
-#define HAS_LED GPIO_NUM_23 // green on board LED (new board ONLY)
 #define HAS_BATTERY_PROBE ADC1_GPIO35_CHANNEL // uses GPIO7
 #define BATT_FACTOR 2 // voltage divider 100k/100k on board
 
@@ -24,8 +55,7 @@
 
 // non arduino pin definitions
 #define RST   LMIC_UNUSED_PIN   // connected to ESP32 RST/EN (old board)
-//#define RST   GPIO_NUM_12     // (old board v1.5)
-//#define RST   GPIO_NUM_19     //(new board)
+//#define RST   GPIO_NUM_12     // (boards labeled v1.5)
 #define DIO0  GPIO_NUM_26 // ESP32 GPIO26 <-> HPD13A IO0
 #define DIO1  GPIO_NUM_33 // ESP32 GPIO33 <-> HPDIO1 <-> HPD13A IO1
 #define DIO2  GPIO_NUM_32 // ESP32 GPIO32 <-> HPDIO2 <-> HPD13A IO2
@@ -33,4 +63,5 @@
 // Hardware pin definitions for TTGO V2 Board with OLED SSD1306 0,96" I2C Display
 #define OLED_RST U8X8_PIN_NONE // connected to CPU RST/EN
 #define OLED_SDA GPIO_NUM_21 // ESP32 GPIO21 -- SD1306 D1+D2
-#define OLED_SCL GPIO_NUM_22 // ESP32 GPIO22 -- SD1306 D0
\ No newline at end of file
+#define OLED_SCL GPIO_NUM_22 // ESP32 GPIO22 -- SD1306 D0
+*/
\ No newline at end of file