How do I check if the value on the display matches the password?

Question

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C++

#include <DHT11.h>
#include <Display.h>
#include <TM1637Display.h>

const int BUZZER = 3;
const int RED_LED = 4;
const int GREEN_LED = 5;
const int BLUE_LED = 6;
const int YELLOW_LED = 7;
const int KEY1 = 8;
const int KEY2 = 9;
const int LDR = 16;

int lastkstate = 1;
int mode = 0; // Mode 0 - Start, Mode 1 - Safe, Mode 2 - Unlocking the safe, Mode 3 - Change password
int dispPosition = 0;
int inputNumber = 1;
int password = 1234;

void setup() {
  // put your setup code here, to run once:
  pinMode(RED_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
  pinMode(YELLOW_LED, OUTPUT);
  pinMode(KEY1, INPUT_PULLUP);
  pinMode(KEY2, INPUT_PULLUP);
  pinMode(LDR, INPUT);
  Display.show("----");
}

void loop() {
  // put your main code here, to run repeatedly:
  int k1state = digitalRead(KEY1);
  int k2state = digitalRead(KEY2);
  if (mode == 0) {
    Display.show("----");
    digitalWrite(RED_LED, HIGH);
    delay(100);
    digitalWrite(GREEN_LED, HIGH);
    delay(100);
    digitalWrite(BLUE_LED, HIGH);
    delay(100);
    digitalWrite(YELLOW_LED, HIGH);
    delay(100);
    digitalWrite(RED_LED, LOW);
    delay(100);
    digitalWrite(GREEN_LED, LOW);
    delay(100);
    digitalWrite(BLUE_LED, LOW);
    delay(100);
    digitalWrite(YELLOW_LED, LOW);
    delay(100);
    mode++;
  }
  if (mode == 1) {
    if (k1state != lastkstate) {
      if (k1state == 0) {
        delay(50);
        dispPosition++;
        inputNumber = 1;
      }
    }
    if (k2state != lastkstate) {
      if (k2state == 0) {
        delay(50);
        inputNumber++;
      }
    }
    delay(50);
    lastkstate = k2state;
    if (inputNumber > 4) {
      inputNumber = 1;
    }
    if (inputNumber == 1)Display.showCharAt(dispPosition, '1');
    if (inputNumber == 2)Display.showCharAt(dispPosition, '2');
    if (inputNumber == 3)Display.showCharAt(dispPosition, '3');
    if (inputNumber == 4)Display.showCharAt(dispPosition, '4');
    delay(50);
    lastkstate = k1state;
    if (dispPosition > 3) {
      mode++;
    }
  }
  if (mode == 2) {
    if
  }
}

What I have tried:

Hi, Arduino newbie here...I have an assignment to make a safe with the Arduino Rich Shield.. In mode 2 I need to check whether the value on the display matches the pre-set password but I can't seem to find a way to compare the two numbers...I would really appreciate it if someone helped me with this. Thank you in advance

Posted 3-Oct-20 10:48am

TheJoKr Channel

Updated 3-Oct-20 22:19pm

KarstenK

v2

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Richard MacCutchan 4-Oct-20 3:39am

What is wrong with an if statement?

1 solution

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KarstenK · Answer 1 · 2020-10-03T22:19:00

Solution 1

should be really easy to compare two numbers

C++

if( input == passcode ) {
// check sucessful
} else {
// handle passcode error
}

You may also look for a do while loop like

C++

do {
 // some code to enter passcode
 input = getPasscode();
} while( input != passcode )

but here is the correct passcode the exit condition for the loop ;-)

Posted 3-Oct-20 22:19pm

KarstenK

Comments

TheJoKr Channel 4-Oct-20 13:13pm

I tried if (mode == 2) {
if ( input == passcode ) {
digitalWrite(GREEN_LED, HIGH);
} else {
digitalWrite(RED_LED, HIGH);
}
}

but for some reason only the red led was turning on no matter whether the code was wrong or right..