Created variant for LilyGo TTGO LoRa32-OLED V2 (#3479)

Hi,

I have added a variant for the LilyGo TTGO LoRa32-OLED V2, which is similar to the LilyGo TTGO LoRa32-OLED V1 but with a different pinout. This will be useful for PlatformIO users, specially because I am also adding the board there as well.

Cheers.

variants/ttgo-lora32-v2/pins_arduino.h

@@ -0,0 +1,82 @@
+#ifndef Pins_Arduino_h
+#define Pins_Arduino_h
+
+#include <stdint.h>
+
+#define EXTERNAL_NUM_INTERRUPTS 16
+#define NUM_DIGITAL_PINS        40
+#define NUM_ANALOG_INPUTS       16
+
+#define analogInputToDigitalPin(p)  (((p)<20)?(esp32_adc2gpio[(p)]):-1)
+#define digitalPinToInterrupt(p)    (((p)<40)?(p):-1)
+#define digitalPinHasPWM(p)         (p < 34)
+
+// I2C OLED Display works with SSD1306 driver
+#define OLED_SDA    21
+#define OLED_SCL    22
+#define OLED_RST    16
+
+// SPI LoRa Radio
+#define LORA_SCK    5   // GPIO5 - SX1276 SCK
+#define LORA_MISO   19  // GPIO19 - SX1276 MISO
+#define LORA_MOSI   27  // GPIO27 - SX1276 MOSI
+#define LORA_CS     18  // GPIO18 - SX1276 CS
+#define LORA_RST    12  // GPIO14 - SX1276 RST
+#define LORA_IRQ    26  // GPIO26 - SX1276 IRQ (interrupt request)
+
+// SD card
+#define SD_SCK  14
+#define SD_MISO 2
+#define SD_MOSI 15
+#define SD_CS   13
+
+static const uint8_t LED_BUILTIN =  22;
+#define BUILTIN_LED  LED_BUILTIN    // backward compatibility
+
+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 SS =   18;
+static const uint8_t MOSI = 27;
+static const uint8_t MISO = 19;
+static const uint8_t SCK =  5;
+
+static const uint8_t A0 =   36;
+static const uint8_t A1 =   37;
+static const uint8_t A2 =   38;
+static const uint8_t A3 =   39;
+static const uint8_t A4 =   32;
+static const uint8_t A5 =   33;
+static const uint8_t A6 =   34;
+static const uint8_t A7 =   35;
+static const uint8_t A10 =  4;
+static const uint8_t A11 =  0;
+static const uint8_t A12 =  2;
+static const uint8_t A13 =  15;
+static const uint8_t A14 =  13;
+static const uint8_t A15 =  12;
+static const uint8_t A16 =  14;
+static const uint8_t A17 =  27;
+static const uint8_t A18 =  25;
+static const uint8_t A19 =  26;
+
+static const uint8_t T0 =   4;
+static const uint8_t T1 =   0;
+static const uint8_t T2 =   2;
+static const uint8_t T3 =   15;
+static const uint8_t T4 =   13;
+static const uint8_t T5 =   12;
+static const uint8_t T6 =   14;
+static const uint8_t T7 =   27;
+static const uint8_t T8 =   33;
+static const uint8_t T9 =   32;
+
+static const uint8_t DAC1 = 25;
+static const uint8_t DAC2 = 26;
+
+#endif /* Pins_Arduino_h */