Init commit with many years of arduino sketches and projects. I dont know if the esp8266 includes much, but there are also libraries. I hope they dont have crazy automatic versioning through the Arduino IDE.

Projects/libraries/Installed_libs/Keypad/examples/loopCounter/loopCounter.ino

@@ -0,0 +1,46 @@
+#include <Keypad.h>
+
+
+const byte ROWS = 4; //four rows
+const byte COLS = 3; //three columns
+char keys[ROWS][COLS] = {
+	{'1','2','3'},
+	{'4','5','6'},
+	{'7','8','9'},
+	{'*','0','#'}
+};
+byte rowPins[ROWS] = {5, 4, 3, 2}; //connect to the row pinouts of the keypad
+byte colPins[COLS] = {8, 7, 6}; //connect to the column pinouts of the keypad
+
+Keypad kpd = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
+
+unsigned long loopCount = 0;
+unsigned long timer_t = 0;
+
+void setup(){
+	Serial.begin(9600);
+	
+	// Try playing with different debounceTime settings to see how it affects
+	// the number of times per second your loop will run. The library prevents
+	// setting it to anything below 1 millisecond.
+	kpd.setDebounceTime(10);	// setDebounceTime(mS)
+}
+
+void loop(){
+	char key = kpd.getKey();
+	
+	// Report the number of times through the loop in 1 second. This will give
+	// you a relative idea of just how much the debounceTime has changed the
+	// speed of your code. If you set a high debounceTime your loopCount will
+	// look good but your keypresses will start to feel sluggish.
+	if ((millis() - timer_t) > 1000) {
+		Serial.print("Your loop code ran ");
+		Serial.print(loopCount);
+		Serial.println(" times over the last second");
+		loopCount = 0;
+		timer_t = millis();
+	}
+	loopCount++;
+	if(key)
+		Serial.println(key);
+}