Workshop

QT keyboard

ref. How to Make a Fruit Piano on Seeeduino XIAO’s Q-Touch Function

Xiao

BOM

Item	Qty
Xiao	1
Jumper wires	1 - 7
Bread Board	(1)

Setup

ref How to Add Seeed boards to Arduino IDE

Arduino IDE

Download

Additional Boards Manager URLs

File > Preferences
Copy below url to Additional Boards Manager URLs

https://files.seeedstudio.com/arduino/package_seeeduino_boards_index.json

Board Manager

Tools > Board > Board Manager
Search “xiao”
Install “Seeed SAMD(32 bit ....)Boards”

Board: “Seeduino XIAO”
Port: “/dev/....(Seeduino XIAO)” or COMx (Seeduino XIAO)

Board and Port

Tools > Board
find “Seeeduino XIAO M0”

Library

TinyUSB_Mouse_and_Keyboard
adafruit/Adafruit_FreeTouch

Sketch > Include Library > Add . ZIP Library

Program

Xiao_QT_keyboard.ino

Download -> Double click to open

#include <Adafruit_FreeTouch.h>

Adafruit_FreeTouch qt_0  = Adafruit_FreeTouch(A0, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
Adafruit_FreeTouch qt_1  = Adafruit_FreeTouch(A1, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
Adafruit_FreeTouch qt_6  = Adafruit_FreeTouch(A6, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
Adafruit_FreeTouch qt_7  = Adafruit_FreeTouch(A7, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
Adafruit_FreeTouch qt_8  = Adafruit_FreeTouch(A8, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
Adafruit_FreeTouch qt_9  = Adafruit_FreeTouch(A9, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);
Adafruit_FreeTouch qt_10 = Adafruit_FreeTouch(A10, OVERSAMPLE_4, RESISTOR_50K, FREQ_MODE_NONE);

#include <TinyUSB_Mouse_and_Keyboard.h>

uint8_t Key2;//pin2 bike sensor in


void setup() {
  Keyboard.begin();
  Serial.begin(115200);

  // initialize digital pin LED_BUILTIN as an output.
  pinMode(LED_BUILTIN, OUTPUT);
  pinMode(2, INPUT_PULLUP);//pin2 bike sensor in

  qt_0.begin();
  qt_1.begin();
  qt_6.begin();
  qt_7.begin();
  qt_8.begin();
  qt_9.begin();
  qt_10.begin();
}

int qt_Threshold = 850;

void loop() {

  Key2 = digitalRead(2);//pin2 bike sensor_in

  int qt0  = 0;
  int qt1  = 0;
  int qt6  = 0;
  int qt7  = 0;
  int qt8  = 0;
  int qt9  = 0;
  int qt10 = 0;

  qt0  = qt_0.measure();
  qt1  = qt_1.measure();
  qt6  = qt_6.measure();
  qt7  = qt_7.measure();
  qt8  = qt_8.measure();
  qt9  = qt_9.measure();
  qt10 = qt_10.measure();


  /* Xiao
          |USB-C|
     |A0_qt0|    |5V|
     |A1_qt1|    |GND|
     |A2_bike|   |3V3|
     |A3|        |A10_qt10|
     |A4|        |A9_qt9|
     |A5|        |A8_qt8|
     |A6_qt6|    |A7_qt7|
  */


  if (Key2 == LOW ) { //pin2 bike sensor_in // XIAO: LOW means On = key pressed
    Key3_act();
  }
  if (qt0 >= qt_Threshold) {
    Serial.print("qt0: "); Serial.println(qt0);
    Key2_act();
  }
  if (qt1 >= qt_Threshold) {
    Serial.print("qt1: "); Serial.println(qt1);
    Key1_act();
  }
  if (qt6 >= qt_Threshold) {
    Serial.print("qt6: "); Serial.println(qt6);
    Key3_act();
  }
  if (qt7 >= qt_Threshold) {
    Serial.print("qt7: "); Serial.println(qt7);
    Key0_act();
  }
  if (qt8 >= qt_Threshold) {
    Serial.print("qt8: "); Serial.println(qt8);
    Key1_act();
  }
  if (qt9 >= qt_Threshold) {
    Serial.print("qt9: "); Serial.println(qt9);
    Key4_act();
  }
  if (qt10 >= qt_Threshold) {
    Serial.print("qt10: "); Serial.println(qt10);
    Key3_act();
  }

  //delay(100);
}

void Key0_act() {
  // <-
  Keyboard.press(KEY_RIGHT_ARROW);
  delay(400);
  Keyboard.releaseAll();

  digitalWrite(LED_BUILTIN, LOW);// XIAO LOW = On
  KeyRelease();
}

void Key1_act() {
  // ->
  Keyboard.press(KEY_LEFT_ARROW);
  delay(400);
  Keyboard.releaseAll();

  digitalWrite(LED_BUILTIN, LOW);
  KeyRelease();
}

void Key2_act() {
  // down arrow
  Keyboard.press(KEY_DOWN_ARROW);
  delay(400);
  Keyboard.releaseAll();

  digitalWrite(LED_BUILTIN, LOW);
  KeyRelease();
}

void Key3_act() {
  // up arrow
  Keyboard.press(KEY_UP_ARROW);
  delay(200);
  Keyboard.releaseAll();

  digitalWrite(LED_BUILTIN, LOW);
  KeyRelease();
}

void Key4_act() {
  // feedback
  Keyboard.press(KEY_LEFT_CTRL);
  Keyboard.press(KEY_LEFT_SHIFT);
  Keyboard.write('f');
  Keyboard.releaseAll();

  digitalWrite(LED_BUILTIN, LOW);
  KeyRelease();
}


void KeyRelease() {
  Keyboard.releaseAll();
  delay(500);
  digitalWrite(LED_BUILTIN, HIGH);// XIAO HIGH = Off
}

Keyboard Functions & Parameters

ref .TinyUSB_Mouse_and_Keyboard/examples/TinyUSB_Keyboard_Test/TinyUSB_Keyboard_Test.ino

Keyboard Functions



/*Example

  Keyboard.write('a');            //press and release 'a' key

  uint8_t Multiple[3]= {'1','2','3'};
  Keyboard.write(Multiple,3);     //multiple keys sequentially from a buffer

  Keyboard.print("456");          //print a string
  Keyboard.println("789");        //print another string with a line

  Keyboard.press(KEY_LEFT_SHIFT); //hold down the shift
  Keyboard.println("a uppercase sentence"); //this will be all caps
  Keyboard.release(KEY_LEFT_SHIFT);//release the shift
  Keyboard.println ("back to lowercase");

  Keyboard.press(KEY_LEFT_SHIFT); //press shift
  Keyboard.println("1234");       //some text
  Keyboard.releaseAll();          //release all

  Keyboard.println("1234");       //not shifted
  Keyboard.print("A mistake");  //will attempt to erase this
  delay(1000);

  Keyboard.press(KEY_LEFT_CTRL);  //will attempt control-z
  Keyboard.write('z');
  Keyboard.releaseAll();         //release the control key
 */

Key code

ref. TinyUSB_Mouse_and_Keyboard/TinyUSB_Mouse_and_Keyboard.h

Key code


/******************************
 *    KEYBOARD SECTION
 ******************************/
  //  Keyboard codes
  //  Note these are different in some respects to the TinyUSB codes but
  //  are compatible with Arduino Keyboard.h API

  #define KEY_LEFT_CTRL   0x80
  #define KEY_LEFT_SHIFT    0x81
  #define KEY_LEFT_ALT    0x82
  #define KEY_LEFT_GUI    0x83
  #define KEY_RIGHT_CTRL    0x84
  #define KEY_RIGHT_SHIFT   0x85
  #define KEY_RIGHT_ALT   0x86
  #define KEY_RIGHT_GUI   0x87

  #define KEY_UP_ARROW    0xDA
  #define KEY_DOWN_ARROW    0xD9
  #define KEY_LEFT_ARROW    0xD8
  #define KEY_RIGHT_ARROW   0xD7
  #define KEY_BACKSPACE   0xB2
  #define KEY_TAB       0xB3
  #define KEY_RETURN      0xB0
  #define KEY_ESC       0xB1
  #define KEY_INSERT      0xD1
  #define KEY_DELETE      0xD4
  #define KEY_PAGE_UP     0xD3
  #define KEY_PAGE_DOWN   0xD6
  #define KEY_HOME      0xD2
  #define KEY_END       0xD5
  #define KEY_CAPS_LOCK   0xC1
  #define KEY_F1        0xC2
  #define KEY_F2        0xC3
  #define KEY_F3        0xC4
  #define KEY_F4        0xC5
  #define KEY_F5        0xC6
  #define KEY_F6        0xC7
  #define KEY_F7        0xC8
  #define KEY_F8        0xC9
  #define KEY_F9        0xCA
  #define KEY_F10       0xCB
  #define KEY_F11       0xCC
  #define KEY_F12       0xCD
  #define KEY_F13       0xF0
  #define KEY_F14       0xF1
  #define KEY_F15       0xF2
  #define KEY_F16       0xF3
  #define KEY_F17       0xF4
  #define KEY_F18       0xF5
  #define KEY_F19       0xF6
  #define KEY_F20       0xF7
  #define KEY_F21       0xF8
  #define KEY_F22       0xF9
  #define KEY_F23       0xFA
  #define KEY_F24       0xFB

OS

ref Keyboard.press()

Windows and Linux

Windows key: KEY_LEFT_GUI
Control key: KEY_LEFT_CTRL

mac

command key: KEY_LEFT_GUI
control key: KEY_LEFT_CTRL

// use this option for OSX:
char ctrlKey = KEY_LEFT_GUI;
// use this option for Windows and Linux:
//  char ctrlKey = KEY_LEFT_CTRL;

Keyboard.press(ctrlKey);

Examples

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Workshop

QT keyboard

Xiao

BOM

Setup

Arduino IDE

Additional Boards Manager URLs

Board Manager

Board and Port

Library

Program

Xiao_QT_keyboard.ino

Keyboard Functions & Parameters

Key code

OS

Windows and Linux

mac

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