Return to Revisions

I'm designing a safe lock of 4 digits, but the password is in terms of colors, I have 3 colors. we are obliged to use a grayscale sensor (SKU: SEN0147).:

the assignment is as follows...

Write a program on Arduino that will be used as a safe lock. Consider having 3 colors black white and grey. Black =0, Red =1 and White=2.

• When the microcontroller is turned on, the safe is locked. The Serial Monitor should
display: "System is online."

• The combination lock should be saved in an array of integers called arr_code.

• The user has 3 trials to open the safe

• The system will wait for the user to enter 4 colors. To enter a color, the grayscale sensor
should be place on top of the desired color. Once ready the push button is pressed. Once released, the color is saved in another array called arr_user_code.

• Once 4 colors are entered, the system should test automatically if the code entered by
the user is equal to the code saved in arr_code.

• If the wrong code is entered, the serial monitor displays: "Wrong Code. Try Again."

• If the user enters the wrong code 3 times in a row the system is locked and a message is
displayed: "System Locked."

• If the correct code is inserted, the Led on pin 13 is turned on.

• The combinations entered by the user should be displayed on the Serial Monitor. The Arduino program should be clear, separated into functions and documented.

the program i wrote is the following:

char led_pin = 13;
char pb_pin = 2;
int gs_pin = A0;
//the brightness of the flash light im using is giving 894 value so im using it for testing purpose
int arr_code[4] = { 894, 894, 894, 894 };
int arr_user_code[4];
int counter;
int Lock_Interval = 2500;
char trigger = false;
bool equal = true;
char led_state = false;
int Array_Compare(int *a, int *b) {
 for (int i = 0; i < 4; i++) {
 if (a[i] != b[i]) return 0;
 else return 1;
 }
}
void Button_Wait(int buttonPin) {//function to sense if button is pressed
 int curr_state;
 int prev_state;
 while (1) {
 prev_state = curr_state;
 curr_state = digitalRead(buttonPin);
 if (curr_state != prev_state) {
 if (curr_state == false) {
 delay(10);
 return;
 }
 }
 }
}
int GS_Value(int gsPin) {
 int gs_value = analogRead(gs_pin);
 return gs_value;
}
void setup() {
 // put your setup code here, to run once:
 pinMode(led_pin, OUTPUT);
 pinMode(pb_pin, INPUT);
 Serial.begin(9600);
 digitalWrite(led_pin, false);
}
void loop() {
 // put your main code here, to run repeatedly:
 Serial.println("System Online");
 Serial.println("Please Enter Passcode:");
 for (counter = 0; counter < 3; counter++) {
 for (int i = 0; i < 4; i++) {//uploading user array with gs values
 Button_Wait(pb_pin);
 arr_user_code[i] = analogRead(gs_pin);
 Serial.print(analogRead(gs_pin));//printing values on monitor
 Serial.print(" ");
 }
 Serial.println(" ");
 for (int i = 0; i < 4 && equal; i++) {//testing if passcode is true
 if (arr_user_code[i] != arr_code[i]) {
 equal = false;
 }
 else equal = true;
 }
 if (equal == true) {
 Serial.println("System Unlocked");
 digitalWrite(led_pin, true);
 }
 else if (equal == false) {
 Serial.println("Wrong Passcode. Try Again");
 }
 }
 /*Array_Compare( arr_user_code, arr_code);
 if (Array_Compare) Serial.println("System UNLOCKED");
 else Serial.println("Wrong Passcode. Try Again");
 */
 if (trigger == false) {//for locking the system
 Serial.println("System LOCKED!");
 while (1) {
 Lock_Interval = Lock_Interval * 2;//CHANGE TO MINUTES LATER ON!!
 delay(Lock_Interval);
 return;
 }
 }
 delay(100);
}

im sorry for having a lot of functions not used and a lot of canceled algorythms by remarks but its my scratch. the issue is that my program is always giving me a wrong passcode even if its correct. can you help me find the problem please? thank you in advance...