IOT safe with keypad or RFID lock

In this post we would like to show how to build an IOT safe with keypad or RFID locking. The following video is the instruction. We will provide additional information via the blogpost.

 Here you can find the products used:

• ESP32 D1 Mini (https://www.az-delivery.de/products/e...)
• LM2596S DC-DC Step down Module (https://www.az-delivery.de/products/l...)
• 5V LED Ring WS2812B (https://www.az-delivery.de/products/r...)
• MG995 Servo Motor (https://www.az-delivery.de/products/a...)
• 4x4 Matrix Keypad (https://www.az-delivery.de/products/4...)
• RFID Kit RC522 (including Reader, Chip and Card) (https://www.az-delivery.de/products/r...)

 Wiring Keypad:

Code Keypad:

/*
    ___ _____        ____       ___                      
   /   /__  /       / __ \___  / (_)   _____  _______  __
  / /| | / / ______/ / / / _ \/ / / | / / _ \/ ___/ / / /
 / ___ |/ /_/_____/ /_/ /  __/ / /| |/ /  __/ /  / /_/ / 
/_/  |_/____/    /_____/\___/_/_/ |___/\___/_/   \__, /  
                                                /____/   
 Product, datasheet and pinout under:
  https://www.az-delivery.de/

 Project: Safe with Keypad and Interior Lighting
 Date: 10/2022

 Keypad control from the example sketch of Chris--A's library:
  https://github.com/Chris--A/Keypad/blob/master/examples/CustomKeypad/CustomKeypad.ino

*/
#include <Arduino.h>
#include <ESP32Servo.h>
#include <SPI.h>
// #include <MFRC522.h>
#include <fastLED.h>
#include <Keypad.h>

// motor
const int servoPin = 2;
Servo myservo;

// leds
const int NUM_LEDS = 12;
const int DATA_PIN = 25;
CRGB leds[NUM_LEDS];
int randomRed = 0;
int randomGreen = 0;
int randomBlue = 0;
const int LEDRed = 4;

bool dooropen = false;

// Keypad
const byte ROWS = 4;    // four rows
const byte COLUMNS = 4; // four columns
// define the symbols on the buttons of the keypads
char hexaKeys[ROWS][COLUMNS] = {
    {'1', '2', '3', 'A'},
    {'4', '5', '6', 'B'},
    {'7', '8', '9', 'C'},
    {'*', '0', '#', 'D'}};
byte rowPins[ROWS] = {16, 17, 21, 22};   // connect to the row pinouts of the keypad
byte colPins[COLUMNS] = {26, 18, 19, 23}; // connect to the column pinouts of the keypad


Keypad keypad = Keypad(makeKeymap(hexaKeys), rowPins, colPins, ROWS, COLUMNS);

const String password = "1234"; // change your password here
String input_password;

void setup()
{
  Serial.begin(115200);
  pinMode(LEDRed, OUTPUT);
  myservo.attach(servoPin);
  FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, NUM_LEDS);
  input_password.reserve(32); // maximum input characters is 33, change if needed
}

void loop()
{
  char key = keypad.getKey();

  if (key)
  {
    Serial.println(key);

    if (key == '#')
    {
      if (password == input_password)
      {
        Serial.println(" Password is correct");
        if (dooropen)
        {
          myservo.write(90); // move MG996R's shaft to angle 0°
          for (int i = 0; i < NUM_LEDS; i++)
          {
            leds[i].setRGB(0, 0, 0); // leds off
          }
          FastLED.setBrightness(20);
          FastLED.show();
          dooropen = false;
          delay(1000);
        }

        else if (dooropen == false)
        {
          myservo.write(0); // move MG996R's shaft to angle 90°
          randomRed = random(1, 256);
          randomBlue = random(1, 256);
          randomGreen = random(1, 256);

          for (int i = 0; i < NUM_LEDS; i++)
          {
            leds[i].setRGB(randomRed, randomGreen, randomBlue); // leds on with random colours
          }
          FastLED.setBrightness(20);
          FastLED.show();
          dooropen = true;
          delay(1000);
        }
      }
      else
      {
        digitalWrite(LEDRed, HIGH);
        delay(1000);
        digitalWrite(LEDRed, LOW);
      }
      input_password = ""; // clear input password
    }

    else if (key == '*')
    {
      input_password = ""; // clear input password
    }
    else
    {
      input_password += key; // append new character to input password string
    }
  }
}

Wiring RFID:

Code RFID:

/*
    ___ _____        ____       ___                      
   /   /__  /       / __ \___  / (_)   _____  _______  __
  / /| | / / ______/ / / / _ \/ / / | / / _ \/ ___/ / / /
 / ___ |/ /_/_____/ /_/ /  __/ / /| |/ /  __/ /  / /_/ / 
/_/  |_/____/    /_____/\___/_/_/ |___/\___/_/   \__, /  
                                                /____/   
 Product, datasheet and pinout under:
  https://www.az-delivery.de/

 Project: Vault with RFID and Node-RED connection via MQTT.
 Date: 10/2022

*/
#include <Arduino.h>
#include <ESP32Servo.h>
#include <SPI.h>
#include <MFRC522.h>
#include <fastLED.h>

// for MQTT
#include <PubSubClient.h>
#include <WiFi.h>
//für etwaigen späteren Gebrauch für MQTT etc. 
#include <ArduinoJson.h>
#include <AsyncTCP.h>
#include "credentials.h"

// MQTT
String clientId = "ESP32-";
const char *mqtt_server = "192.168.178.42";
const char *mqtt_user = "azdelivery";
const char *mqtt_password = "myhiddenpassword";
WiFiClient espClient;
PubSubClient client(espClient);
long lastMsg = 0;
char msg[50];
int value = 0;

// RFID
const int SS_PIN = 5;
const int RST_PIN = 27;
MFRC522 rfid(SS_PIN, RST_PIN);

// motor
const int servoPin = 2;
Servo myservo;

// leds
const int NUM_LEDS = 12;
const int DATA_PIN = 25;
CRGB leds[NUM_LEDS];
int randomRed = 0;
int randomGreen = 0;
int randomBlue = 0;
const int LEDRed = 4;

bool dooropen = false;

void reconnect()
{
  // Loop until we're reconnected
  while (!client.connected())
  {
    Serial.print("Attempting MQTT connection...");
    // Attempt to connect
    clientId += String(random(0xffff), HEX);
    if (client.connect(clientId.c_str(), mqtt_user, mqtt_password))
    {
      Serial.println("connected");
      // for this example not necessary
      // client.subscribe("topic");
    }
    else
    {
      Serial.print("failed, rc=");
      Serial.print(client.state());
      Serial.println(" try again in 5 seconds");
      // Wait 5 seconds before retrying
      delay(5000);
    }
  }
}

// only required if we get informations from mqtt

void callback(char *topic, byte *message, unsigned int length)
{
  Serial.print("Message arrived on topic: ");
  Serial.print(topic);
  Serial.print(". Message: ");
  String messageTemp;

  for (int i = 0; i < length; i++)
  {
    Serial.print((char)message[i]);
    messageTemp += (char)message[i];
  }
  Serial.println();

  if (String(topic) == "topic")
  {
    // action
  }
}

void connectAP()
{

  Serial.println("Connecting to WiFi..");
  WiFi.begin(ssid, password);

  int cnt = 0;
  while (WiFi.status() != WL_CONNECTED)
  {
    delay(1000);
    Serial.print(".");
    cnt++;

    if (cnt > 30)
      ESP.restart();
  }
  Serial.println(WiFi.localIP());
}

void setup()
{
  Serial.begin(115200);
  pinMode(LEDRed, OUTPUT);
  SPI.begin();     // start SPI bus
  rfid.PCD_Init(); // start RFID-Modul
  Serial.println("RFID-RC522 ist bereit");

  myservo.attach(servoPin);

  FastLED.addLeds<WS2812, DATA_PIN, GRB>(leds, NUM_LEDS);

  connectAP();
  client.setServer(mqtt_server, 1883);
  client.setCallback(callback);
}

void loop()
{

  if (!client.connected())
  {
    reconnect();
  }
  if (!client.loop())
    client.connect("ESP32Tresor");

  if (!rfid.PICC_IsNewCardPresent())
  {
    return;
  }
  if (!rfid.PICC_ReadCardSerial())
  {
    return;
  }

  Serial.println();
  // read the RFID-tags
  Serial.print(" UID tag  :");
  String content = "";
  for (byte i = 0; i < rfid.uid.size; i++)
  {
    Serial.print(rfid.uid.uidByte[i] < 0x10 ? " 0" : " ");
    Serial.print(rfid.uid.uidByte[i], HEX);
    content.concat(String(rfid.uid.uidByte[i] < 0x10 ? " 0" : " "));
    content.concat(String(rfid.uid.uidByte[i], HEX));
  }
  content.toUpperCase();
  Serial.println();
  Serial.print(" PICC type: ");
  MFRC522::PICC_Type piccType = rfid.PICC_GetType(rfid.uid.sak);
  // the returned hex-value can be used for further actions

  Serial.println(rfid.PICC_GetTypeName(piccType));

  if (content.substring(1) == "AC 32 E6 8C")
  {

    if (dooropen)
    {
      myservo.write(90); // move MG996R's shaft to angle 0°
      for (int i = 0; i < NUM_LEDS; i++)
      {
        leds[i].setRGB(0, 0, 0); // leds off
      }
      FastLED.setBrightness(50);
      FastLED.show();
      dooropen = false;
      delay(1000);
    }

    else if (dooropen == false)
    {
      myservo.write(0); // move MG996R's shaft to angle 90°
      randomRed = random(1, 256);
      randomBlue = random(1, 256);
      randomGreen = random(1, 256);

      for (int i = 0; i < NUM_LEDS; i++)
      {
        leds[i].setRGB(randomRed, randomGreen, randomBlue); // leds on with random colours
      }
      FastLED.setBrightness(50);
      FastLED.show();
      client.publish("safe", "Your safe has been opened"); // E-Mail
      dooropen = true;
      delay(1000);
    }
  }
  else
  {
    digitalWrite(LEDRed, HIGH);
    delay(1000);
    digitalWrite(LEDRed, LOW);
    delay(1000);
  }
}

Credentials for this:

const char* ssid = "myhiddenSSID";
const char* password = "mytopsecreitpassword";