feat: Add Programmed External Keys.

examples/Programmable Buttons/Programmed External Keys.ino

@@ -0,0 +1,68 @@
+/*
+  Programmed External Keys (Keyboard)
+
+  For the Arduino Leonardo/any other arduino board with usb interface
+
+  Reads a key from push button & acts as a CTRL+C (Copy).
+  Reads another key from push button & acts as a CTRL+V (Paste).
+
+
+  The circuit:
+
+  The push button has 2 connectors. 
+  We must connect gnd and the second will be connected to any I/O pin. 
+
+connect register between (button & gnd)& then set pinMode() as INPUT.
+
+  created 18 March 2020
+
+  by Prathamesh Sahasrabhojane (TheShubham99)
+
+*/
+
+#include "Keyboard.h"
+
+const int btnPin[] = {2, 3, 4, 5};
+int pincount = 4;
+int btnState[] = {0, 0, 0, 0};
+int prevbtnState[] = {HIGH, HIGH, HIGH, HIGH};
+
+long lastDebounceTime[] = {0, 0, 0, 0};
+long debounceDelay = 50;
+void setup() {
+  for (int thisPin = pincount - 1; thisPin >= 0; thisPin--) {
+    pinMode(btnPin[thisPin], INPUT);
+    digitalWrite(btnPin[thisPin], HIGH);
+  }
+  Keyboard.begin();
+}
+
+// Place the actions needed after pin press here
+int outputAction(int currentButton) {
+    if (currentButton == 1) {
+      Keyboard.press(ctrlKey);
+      Keyboard.press('c');
+      delay(100);
+      Keyboard.releaseAll();
+    }
+    if (currentButton + 1 == 2) {
+      Keyboard.press(ctrlKey);
+      Keyboard.press('v');
+      delay(100);
+      Keyboard.releaseAll();
+    }
+}
+void loop() {
+  for (int thisPin = pincount - 1; thisPin >= 0; thisPin--) {
+    btnState[thisPin] = digitalRead(btnPin[thisPin]);
+
+    if ((btnState[thisPin] != prevbtnState[thisPin]) && (btnState[thisPin] == HIGH)) {
+      if ((millis() - lastDebounceTime[thisPin]) > debounceDelay) {
+        outputAction(thisPin);
+        lastDebounceTime[thisPin] = millis();
+      }
+    }
+
+    prevbtnState[thisPin] = btnState[thisPin];
+  }
+}