Arduino Leonardo - Electronic Lock

Placed on 2020-06-22

Getting the code from user input

So like I described in part 1, we have to get all the required input from the user and check the code with the saved one.

And also check if the display doesn't overflow. That is handled by this code.

GetCode function

const unsigned char MaxPasscodeLength = 19;
unsigned char PasscodeLength;
char Data[MaxPasscodeLength];
char Master[MaxPasscodeLength];

unsigned char data_count = 0;
char Key;

void GetCode() {							// This piece of code handles getting the code from the user
   if (data_count < MaxPasscodeLength) {
    Data[data_count] = Key; 
    lcd.setCursor(data_count,1); 
    lcd.print("*");
    if (EnableDebug) {
      Serial.println();
      Serial.print("Data_count: ");
      Serial.println(data_count);
      Serial.print("Data: ");
      Serial.println(Data[data_count]);
    }
    data_count++;
   }
   else {
      lcd.setCursor(data_count,1);
      lcd.print("*");
      lcd.setCursor(0, 3);
      lcd.print("Passcode Overflow");
      if (EnableDebug) {
        Serial.println();
        Serial.println("Passcode Overflow Error");
      }
      _delay_ms(1000);
      lcd.clear();
      clearData();
   }
}

Checking the code

We also have to check if the code matches the saved code, so we know when we are able to open the lock and when we don't.

CheckCode Function

void CodeCorrect() {
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Correct");
  LockState = true;
  _delay_ms(1000);
  if (EnableDebug) {
    Serial.println();
    Serial.println("Opened");
  }
}

void CodeIncorrect() {
  lcd.clear();
  lcd.setCursor(0,0);
  lcd.print("Incorrect");
  if (EnableDebug) {
    Serial.println();
    Serial.println("Incorrect PSWD");
  }
  LockState = false;
  _delay_ms(1000);
}

void OpenLock() {
  if (EnableServo) {
    Lock.write(90);
  }
  lcd.setCursor(0,0);
  lcd.print("Lock Opened");
  lcd.setCursor(0,2);
  lcd.print("Press -* to lock");
  if (EnablePasscodeChange) {
    lcd.setCursor(3,3);
    lcd.print("-# to change code");
  }
  TimeLastActivity = millis();
}

void CloseLock() {
  if (EnableServo) {
    Lock.write(180);
  }
  LockState = false;
  lcd.clear();
  if (EnableDebug) {
    Serial.println();
    Serial.println("Closing");
  }
  TimeLastActivity = millis();
}

void CheckCode() {
  if(data_count == PasscodeLength){
      Data[PasscodeLength] = 0;
      _delay_ms(500);
      lcd.clear();
      if (EnableDebug) {
        Serial.println();
        Serial.print("Data:   ");
        Serial.println(Data);
        Serial.print("Master: ");
        Serial.println(Master);
      }
      if(!strcmp(Data, Master)){
          CodeCorrect();
        }

      else{
          if (EnableDebug) {
            Serial.println();
            Serial.print("PasscodeLength: ");
            Serial.println(PasscodeLength);
            Serial.print("DataCount: ");
            Serial.println(data_count);
          }
          CodeIncorrect();
        }
  }
  else {
      if (EnableDebug) {
        Serial.println();
        Serial.print("Data:   ");
        Serial.println(Data);
        Serial.print("Master: ");
        Serial.println(Master);
        Serial.println();
        Serial.print("PasscodeLength: ");
        Serial.println(PasscodeLength);
        Serial.print("DataCount: ");
        Serial.println(data_count);
      }
      CodeIncorrect();
    }
  lcd.clear();
  clearData();
}

Previous page 7. The code - part 2 - The LCD Current Page 8. The code - part 3 - The code Next page 9. The code - part 4 - More codes 1. Introduction 2. The Schematic 3. The Keypad 4. The LCD module 5. The Servo 6. The code - part 1 - The Keypad 7. The code - part 2 - The LCD 8. The code - part 3 - The code 9. The code - part 4 - More codes 10. The code - part 5 - Setup and Loop 11. The full code Posted by Sander Speetjens

Arduino Leonardo - Electronic Lock

Getting the code from user input

GetCode function

Checking the code

CheckCode Function

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