KeyboardReprogram.ino

/*
  Arduino Programs Blink

  This sketch demonstrates the Keyboard library.

  For Leonardo and Due boards only.

  When you connect pin 2 to ground, it creates a new window with a key
  combination (CTRL-N), then types in the Blink sketch, then auto-formats the
  text using another key combination (CTRL-T), then uploads the sketch to the
  currently selected Arduino using a final key combination (CTRL-U).

  Circuit:
  - Arduino Leonardo, Micro, Due, LilyPad USB, or Yún
  - wire to connect D2 to ground

  created 5 Mar 2012
  modified 29 Mar 2012
  by Tom Igoe
  modified 3 May 2014
  by Scott Fitzgerald

  This example is in the public domain.

  http://www.arduino.cc/en/Tutorial/KeyboardReprogram
*/
#ifndef ARDUINO_USB_MODE
#error This ESP32 SoC has no Native USB interface
#elif ARDUINO_USB_MODE == 1
#warning This sketch should be used when USB is in OTG mode
void setup() {}
void loop() {}
#else

#include "USB.h"
#include "USBHIDKeyboard.h"
USBHIDKeyboard Keyboard;

const int buttonPin = 0;  // input pin for pushbutton

// use this option for OSX.
// Comment it out if using Windows or Linux:
char ctrlKey = KEY_LEFT_GUI;
// use this option for Windows and Linux.
// leave commented out if using OSX:
//  char ctrlKey = KEY_LEFT_CTRL;

void setup() {
  // make pin 0 an input and turn on the pull-up resistor so it goes high unless
  // connected to ground:
  pinMode(buttonPin, INPUT_PULLUP);
  // initialize control over the keyboard:
  Keyboard.begin();
  USB.begin();
}

void loop() {
  while (digitalRead(buttonPin) == HIGH) {
    // do nothing until pin 0 goes low
    delay(500);
  }
  delay(1000);
  // new document:
  Keyboard.press(ctrlKey);
  Keyboard.press('n');
  delay(100);
  Keyboard.releaseAll();
  // wait for new window to open:
  delay(1000);

  // versions of the Arduino IDE after 1.5 pre-populate new sketches with
  // setup() and loop() functions let's clear the window before typing anything new
  // select all
  Keyboard.press(ctrlKey);
  Keyboard.press('a');
  delay(500);
  Keyboard.releaseAll();
  // delete the selected text
  Keyboard.write(KEY_BACKSPACE);
  delay(500);

  // Type out "blink":
  Keyboard.println("void setup() {");
  Keyboard.println("pinMode(13, OUTPUT);");
  Keyboard.println("}");
  Keyboard.println();
  Keyboard.println("void loop() {");
  Keyboard.println("digitalWrite(13, HIGH);");
  Keyboard.print("delay(3000);");
  // 3000 ms is too long. Delete it:
  for (int keystrokes = 0; keystrokes < 6; keystrokes++) {
    delay(500);
    Keyboard.write(KEY_BACKSPACE);
  }
  // make it 1000 instead:
  Keyboard.println("1000);");
  Keyboard.println("digitalWrite(13, LOW);");
  Keyboard.println("delay(1000);");
  Keyboard.println("}");
  // tidy up:
  Keyboard.press(ctrlKey);
  Keyboard.press('t');
  delay(100);
  Keyboard.releaseAll();
  delay(3000);
  // upload code:
  Keyboard.press(ctrlKey);
  Keyboard.press('u');
  delay(100);
  Keyboard.releaseAll();

  // wait for the sweet oblivion of reprogramming:
  while (true) {
    delay(1000);
  }
}
#endif /* ARDUINO_USB_MODE */