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#### Keyboard Modifiers

The Keyboard.write() and Keyboard.press() and Keyboard.release() commands don’t work with every possible ASCII character, only those that correspond to a key on the keyboard. For example, backspace works, but many of the other non-printable characters produce unpredictable results. For capital letters (and other keys), what’s sent is shift plus the character (i.e. the equivalent of pressing both of those keys on the keyboard).

A modifier key is a special key on a computer keyboard that modifies the normal action of another key when the two are pressed in combination.

For more on ASCII values and the characters or functions they represent, see asciitable.com

For multiple key presses use Keyboard.press()

The Leonardo's definitions for modifier keys are listed below:

Key | Hexadecimal value | Decimal value
KEY_LEFT_CTRL | 0x80 | 128
KEY_LEFT_SHIFT | 0x81 | 129
KEY_LEFT_ALT | 0x82 | 130
KEY_LEFT_GUI | 0x83 | 131
KEY_RIGHT_CTRL | 0x84 | 132
KEY_RIGHT_SHIFT | 0x85 | 133
KEY_RIGHT_ALT | 0x86 | 134
KEY_RIGHT_GUI | 0x87 | 135
KEY_UP_ARROW | 0xDA | 218
KEY_DOWN_ARROW | 0xD9 | 217
KEY_LEFT_ARROW | 0xD8 | 216
KEY_RIGHT_ARROW | 0xD7 | 215
KEY_BACKSPACE | 0xB2 | 178
KEY_TAB | 0xB3 | 179
KEY_RETURN | 0xB0 | 176
KEY_ESC | 0xB1 | 177
KEY_INSERT | 0xD1 | 209
KEY_DELETE | 0xD4 | 212
KEY_PAGE_UP | 0xD3 | 211
KEY_PAGE_DOWN | 0xD6 | 214
KEY_HOME | 0xD2 | 210
KEY_END | 0xD5 | 213
KEY_CAPS_LOCK | 0xC1 | 193
KEY_F1 | 0xC2 | 194
KEY_F2 | 0xC3 | 195
KEY_F3 | 0xC4 | 196
KEY_F4 | 0xC5 | 197
KEY_F5 | 0xC6 | 198
KEY_F6 | 0xC7 | 199
KEY_F7 | 0xC8 | 200
KEY_F8 | 0xC9 | 201
KEY_F9 | 0xCA | 202
KEY_F10 | 0xCB | 203
KEY_F11 | 0xCC | 204
KEY_F12 | 0xCD | 205

#### See Also

- Keyboard.begin()
- Keyboard.end()
- Keyboard.press()
- Keyboard.release()
- Keyboard.releaseAll()

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