CloudKey: The IoT Smart Lock

1C#include "thingProperties.h"
2#include <Servo.h>
3
4// Rotary Encoder pins
5#define CLK 4
6#define DT 5
7#define SW 6
8
9// Ultrasonic pins
10#define TRIG 2
11#define ECHO 3
12
13Servo lockServo;
14
15int counter = 0;
16int lastStateCLK;
17String enteredCode = "";
18String correctCode = "1"; // Set your password here
19bool personDetected = false;
20bool lastPersonDetected = false; // to track state change
21
22void setup() {
23  Serial.begin(9600);
24  delay(1500);
25
26  // Initialize Arduino Cloud properties
27  initProperties();
28  ArduinoCloud.begin(ArduinoIoTPreferredConnection);
29
30  pinMode(CLK, INPUT);
31  pinMode(DT, INPUT);
32  pinMode(SW, INPUT_PULLUP);
33
34  pinMode(TRIG, OUTPUT);
35  pinMode(ECHO, INPUT);
36
37  lockServo.attach(9); // Servo pin
38
39  lastStateCLK = digitalRead(CLK);
40
41  lock_control = false; // default locked
42  lockServo.write(0);   // lock position
43}
44
45void loop() {
46  ArduinoCloud.update();
47
48  // Rotary Encoder handling
49  int currentStateCLK = digitalRead(CLK);
50  if (currentStateCLK != lastStateCLK && currentStateCLK == 1) {
51    if (digitalRead(DT) != currentStateCLK) {
52      counter++;
53    } else {
54      counter--;
55    }
56    Serial.print("Code: ");
57    Serial.println(counter);
58  }
59  lastStateCLK = currentStateCLK;
60
61  // Button press to submit code
62  if (digitalRead(SW) == LOW) {
63    enteredCode += String(counter);
64    Serial.print("Entered Code: ");
65    Serial.println(enteredCode);
66    delay(300);
67    counter = 0; // reset for next digit
68
69    if (enteredCode.length() >= correctCode.length()) {
70      if (enteredCode == correctCode) {
71        Serial.println("Correct Code! Unlocking...");
72        lock_control = true;
73        lockServo.write(90);
74      } else {
75        Serial.println("Wrong Code! Locking...");
76        lock_control = false;
77        lockServo.write(0);
78      }
79      enteredCode = ""; // reset
80    }
81  }
82
83  // Ultrasonic person detection
84  long duration, distance;
85  digitalWrite(TRIG, LOW);
86  delayMicroseconds(2);
87  digitalWrite(TRIG, HIGH);
88  delayMicroseconds(10);
89  digitalWrite(TRIG, LOW);
90  duration = pulseIn(ECHO, HIGH);
91  distance = duration * 0.034 / 2;
92
93  personDetected = (distance > 0 && distance < 100);
94
95  // Only print when detection state changes to true
96  if (personDetected && !lastPersonDetected) {
97    Serial.println("Person Detected!");
98  }
99
100  lastPersonDetected = personDetected;
101
102  // Cloud-controlled lock override
103  if (lock_control) {
104    lockServo.write(90);
105  } else {
106    lockServo.write(0);
107  }
108}
109
110// Cloud variable change function
111void onLockControlChange() {
112  if (lock_control) {
113    Serial.println("Cloud: Unlock");
114    lockServo.write(90);
115  } else {
116    Serial.println("Cloud: Lock");
117    lockServo.write(0);
118  }
119}