Ardunio Switch control

[Sebastian Kurpiel]

Hey guys, I'm wondering how to program a switch into my code. My idea is adding it to the loop as if (inswitch= high), open lock.  Would this work?

code:

#include <SPI.h>
#include <MFRC522.h>
#include <Servo.h> 

#define RST_PIN         9           
#define SS_PIN          10         

MFRC522 mfrc522(SS_PIN, RST_PIN);   // Create MFRC522 instance.

String read_rfid;
String ok_rfid_1="3d265ac2";
String ok_rfid_2="35a5715";
//String ok_rfid_2="ffffffff"; //add as many as you need.
int lock=3; //Which pin the lock will be on if using a relay or solenoid or similar 
int LED = 6;
int inswitch = 1;

//Use the lines below if you plan on using a servo as a locking mechanism.

Servo myservo;  // create servo object to control a servo 
int posClosed = 360;    // variable to store the servo position for locked
int posOpen = 0;    //same for open...
 
/*
 * Initialize.
 */
void setup() {
    Serial.begin(9600);         // Initialize serial communications with the PC
    while (!Serial);            // Do nothing if no serial port is opened (added for Arduinos based on ATMEGA32U4)
    SPI.begin();                // Init SPI bus
    mfrc522.PCD_Init();         // Init MFRC522 card
    pinMode(LED,OUTPUT);
    //Choose which lock below:
    pinMode(lock, OUTPUT);
    myservo.attach(3);  // attaches the servo on pin 2 to the servo object 
    digitalWrite(LED,HIGH);
}

/*
 * Helper routine to dump a byte array as hex values to Serial.
 */
void dump_byte_array(byte *buffer, byte bufferSize) {
    read_rfid="";
    for (byte i = 0; i < bufferSize; i++) {
        read_rfid=read_rfid + String(buffer[i], HEX);
    }
}

void open_lock() {
  
  //Use this routine when working with Servos.
  myservo.write(0); 
  digitalWrite(LED,LOW);
  delay(4000);
  myservo.write(160);
  digitalWrite(LED,HIGH);
}

void loop() {

      // Look for new cards
    if ( ! mfrc522.PICC_IsNewCardPresent())
        return;

    // Select one of the cards
    if ( ! mfrc522.PICC_ReadCardSerial())
        return;

    dump_byte_array(mfrc522.uid.uidByte, mfrc522.uid.size);
    Serial.println(read_rfid);
    if (read_rfid==ok_rfid_1) {
      Serial.println("Welcome");
      open_lock();
    }

    if (read_rfid==ok_rfid_2) {
         Serial.println("Welcome");
         open_lock();
   }

   if (
    // else not needed. Anything else is not ok, and will not open the door...
}

 

[Pieterv24]

Are you talking about a switch in programming terms or in physical terms like a light switch?

[Coldreactor]

Yes, though if you might want to add a pullup or pulldown resistor on that line and you may have problems with debouncing so adding a capacitor to the line might help.