Smart Security Monitoring System with Arduino UNO, RFID and PIR Sensor

1#include <SPI.h>
2#include <mcp_can.h>
3
4#define CAN_CS_PIN 10        
5#define CAN_INT_PIN 2  
6
7MCP_CAN CAN0(CAN_CS_PIN);    
8
9long unsigned int rxId;
10unsigned char len = 0;
11unsigned char rxBuf[8];
12
13bool waitingForUserInput = false;
14String inputCommand = "";
15
16void setup() {
17  Serial.begin(115200);
18  while (!Serial);
19  SPI.begin();
20
21  if (CAN0.begin(MCP_ANY, CAN_125KBPS, MCP_16MHZ) == CAN_OK) {
22    Serial.println("ESP32 MCP2515 Initialized Successfully!");
23  } else {
24    Serial.println("Error Initializing MCP2515 on ESP32...");
25  }
26
27  CAN0.setMode(MCP_NORMAL);  
28  pinMode(CAN_INT_PIN, INPUT);
29}
30
31void loop() {
32  if (!digitalRead(CAN_INT_PIN)) {
33    CAN0.readMsgBuf(&rxId, &len, rxBuf);
34
35    Serial.print("Received UID from Arduino: ");
36    for (byte i = 0; i < len; i++) {
37      if (rxBuf[i] < 0x10) Serial.print("0");
38      Serial.print(rxBuf[i], HEX);
39      if (i < len - 1) Serial.print(":");
40    }
41    Serial.println();
42
43    Serial.println("Enter command (OPEN / CLOSE / NONE):");
44    inputCommand = "";
45    waitingForUserInput = true;
46  }
47
48  if (waitingForUserInput && Serial.available()) {
49    char receivedChar = Serial.read();
50
51    if (receivedChar == '\n' || receivedChar == '\r') {
52      inputCommand.trim();
53
54      if (inputCommand.equalsIgnoreCase("OPEN") || 
55        inputCommand.equalsIgnoreCase("CLOSE") || 
56        inputCommand.equalsIgnoreCase("NONE")) {
57
58        byte response[8] = { 0 };
59        byte responseLen;
60        byte responseCanId = 0x101;
61
62        if (inputCommand.equalsIgnoreCase("OPEN")) {
63        byte msg[] = { 'O', 'P', 'E', 'N' };
64        memcpy(response, msg, sizeof(msg));
65        responseLen = sizeof(msg);
66        }
67        else if (inputCommand.equalsIgnoreCase("CLOSE")) {
68        byte msg[] = { 'C', 'L', 'O', 'S', 'E' };
69        memcpy(response, msg, sizeof(msg));
70        responseLen = sizeof(msg);
71        }
72        else if (inputCommand.equalsIgnoreCase("NONE")) {
73        byte msg[] = { 'N', 'O', 'N', 'E' };
74        memcpy(response, msg, sizeof(msg));
75        responseLen = sizeof(msg);
76        }
77
78        if (CAN0.sendMsgBuf(responseCanId, 0, responseLen, response) == CAN_OK) {
79        Serial.print("Command '");
80        Serial.print(inputCommand);
81        Serial.println("' sent to Arduino.");
82        } else {
83        Serial.println("Error sending CAN message.");
84        }
85
86        waitingForUserInput = false;
87        inputCommand = "";
88
89      } else {
90        Serial.println("Invalid command. Enter OPEN / CLOSE / NONE:");
91        inputCommand = "";
92      }
93    } else {
94      inputCommand += receivedChar;
95    }
96  }
97}