text: #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)
  
  static const uint8_t LED_BUILTIN = 2;
  #define BUILTIN_LED  LED_BUILTIN // backward compatibility
  #define LED_BUILTIN LED_BUILTIN
  
  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    = 5;
  static const uint8_t MOSI  = 23;
  static const uint8_t MISO  = 19;
  static const uint8_t SCK   = 18;
  
  static const uint8_t A0 = 36;
  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 */
  