Simple footboard implementation

footboard.ino

@@ -0,0 +1,61 @@
+char n_buttons = 7;
+char button_pins[] = {0, 1, 2, 3, 4, 5, 6};
+char pin_state[] = {HIGH, HIGH, HIGH, HIGH, HIGH, HIGH, HIGH};
+
+char modKey = KEY_LEFT_CTRL;
+
+int buttons[7][6] = {
+  {'1'},
+  {'2'},
+  {'3'},
+  {'4'},
+  {'5'},
+  {'6'},
+  {'7'}
+};
+char sequence_length[] = {1, 1, 1, 1, 1, 1, 1};
+
+
+void setup() {
+  // put your setup code here, to run once:
+  for (int i = 0; i < n_buttons; ++i) {
+    pinMode(button_pins[i], INPUT_PULLUP);
+  }
+  Keyboard.begin()
+}
+
+
+void loop() {
+  char state = 0;
+  for (int i = 0; i < n_buttons; ++i) {
+    state = digitalRead(button_pins[i]);
+    if (state != pin_state[i]) {
+      pin_state[i] = state;
+      set_button_state(i, state);
+    }
+  }
+  delay(10);
+}
+
+
+void set_button_state(int button_i, char state) {
+  int *sequence = buttons[button_i];
+  char len = sequence_length[button_i];
+
+  if (sequence_length[button_i] == 1) {
+    if (state == LOW) {
+      Keyboard.press(modKey);
+      Keyboard.press(sequence[0]);
+    } else {
+      Keyboard.releaseAll();
+    }
+  } else if(state == LOW) {
+    Keyboard.press(modKey);
+    for (int i = 0; i < len; ++i) {
+      Keyboard.press(sequence[i]);
+      Keyboard.release(sequence[i]);
+      delay(12);
+    }
+    Keyboard.releaseAll();
+  }
+}