Correct pins for actual hardware (#1768)

The original pins_arduino.h did not correspond to the actual hardware.

Author: stickbreaker

Diff for: variants/heltec_wifi_lora_32/pins_arduino.h

@@ -19,8 +19,8 @@ static const uint8_t KEY_BUILTIN = 0;
 static const uint8_t TX = 1;
 static const uint8_t RX = 3;
 
-static const uint8_t SDA = 21;
-static const uint8_t SCL = 22;
+static const uint8_t SDA = 4;
+static const uint8_t SCL = 15;
 
 static const uint8_t SS    = 18;
 static const uint8_t MOSI  = 27;
@@ -61,4 +61,17 @@ static const uint8_t T9 = 33;
 static const uint8_t DAC1 = 26;
 static const uint8_t DAC2 = 25;
 
+// OLed
+static const uint8_t OLED_SCL = 15;
+static const uint8_t OLED_SDA = 4;
+static const uint8_t OLED_RST = 16;
+
+// LoRA
+static const uint8_t LORA_SCK = 5;
+static const uint8_t LORA_MOSI = 27;
+static const uint8_t LORA_MISO = 19;
+static const uint8_t LORA_CS = 18;
+static const uint8_t LORA_RST = 14;
+static const uint8_t LORA_IRQ = 26;
+
 #endif /* Pins_Arduino_h */