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/Lock/Lock.ino

@@ -0,0 +1,104 @@
+// Keypad_Lock.ino
+#include <Servo.h>
+#include <Keypad.h>
+
+// Output
+int led = 2;
+
+// Input
+char passphrase[] = {'1', '2', '3', '4'};
+int pass_length = sizeof(passphrase);
+bool locked = true;
+int i = 0;
+int angle = 0;
+
+const byte rows = 4;
+const byte cols = 3;
+char keys[rows][cols] = {
+	{'1', '2', '3'},
+	{'4', '5', '6'},
+	{'7', '8', '9'},
+	{'*', '0', '#'}
+};
+
+byte rowPins[rows] = {9, 8, 7, 6};
+byte colPins[cols] = {5, 4, 3};
+
+Servo myservo;
+Keypad keypad = Keypad(makeKeymap(keys), rowPins, colPins, rows, cols);
+
+void unlock() {
+	locked = false;
+
+	for(int i=0; i<5; i++) {
+		digitalWrite(led, HIGH);
+		delay(250);
+		digitalWrite(led, LOW);   
+		delay(250);
+	}
+
+	myservo.write(160);
+}
+
+void lock() {
+	locked = true;
+	i = 0;
+
+	myservo.write(40);
+}
+
+void correct_entry() {
+	i++;
+	
+	if (i!=pass_length) {
+		//digitalWrite(led, HIGH);
+		//delay(250);
+		//digitalWrite(led, LOW);
+	}
+	else {
+		unlock();
+	}
+}
+
+void setup() {
+	Serial.begin(9600);
+
+	// Output
+	pinMode(led, OUTPUT);
+	myservo.attach(10, 0, 2000);
+}
+
+void loop() {
+	char key = keypad.getKey();
+
+	if (key) {
+		// Debug
+		Serial.print(key);
+		Serial.println(passphrase[i]);
+
+		// key_pressed();
+
+		if (locked==false) {
+			if (key=='*') {
+				lock();
+			} 
+		}
+		else {
+			if (i==0) {
+				if (key==passphrase[i]) {
+					correct_entry();
+				}
+			}
+			else if (i>0) {
+				if (key==passphrase[i]) {
+					correct_entry();
+				}
+				else {
+					i=0;
+				}
+			}
+		}
+	}
+}
+
+