Revision 0:754caf209809, committed 2018-02-12

Comitter:

ShaniceLim

Date:

Mon Feb 12 02:43:57 2018 +0000

Commit message:

Embedded System Design Assignment

Changed in this revision

diff -r 000000000000 -r 754caf209809 Keypad.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Keypad.lib	Mon Feb 12 02:43:57 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/grantphillips/code/Keypad/#4bbd88022a6f

diff -r 000000000000 -r 754caf209809 Servo.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Servo.lib	Mon Feb 12 02:43:57 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/simon/code/Servo/#36b69a7ced07

diff -r 000000000000 -r 754caf209809 TextLCD.lib
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/TextLCD.lib	Mon Feb 12 02:43:57 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/simon/code/TextLCD/#308d188a2d3a

diff -r 000000000000 -r 754caf209809 main.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/main.cpp	Mon Feb 12 02:43:57 2018 +0000
@@ -0,0 +1,82 @@
+#include "mbed.h"       // Library for mbed
+#include "Servo.h"      // Library for servo motor
+#include "Keypad.h"     // Library for 4x4 matrix keypad
+#include "TextLCD.h"    // Library for 16x2 LCD
+#include <string>       // Library for string class
+
+Servo myservo(PTB3);            // Signal pin of servo motor attach to pin PTB3 
+DigitalIn IR_sensor(PTA12);     // IR obstacle sensor connect to digital pin PTA12
+DigitalOut LED(PTD4);           // Green LED connect to digital pin PTD4
+DigitalOut LCD(PTC12);          // Cathode pin of LCD connect to PTC12
+
+// Keypad connection (col 0, col1, col2, col3, row0, row1, row2, row3)
+Keypad keypad(PTC9,PTC8,PTA5,PTA4,PTD2,PTD0,PTD5,PTA13);
+// LCD connection ( RS, E, D4, D5, D6, D7)
+TextLCD lcd(PTE20, PTE21, PTE22, PTE23, PTE29, PTE30, TextLCD::LCD16x2); 
+
+char pass_set[4] = {'1','2','3','4'};   // Predefined password
+char password[4] ;                      // String used to store password input
+
+int main() {                    // Main function
+    char key, old_key;          // Declare char variables key and old_key
+    int i=0,j=0;                // Declare integer variables i and j and initialize to 0
+    int released = 1;           // Declare integer variable ‘released’ used to indicate whether the key is pressed
+    int ret = 2;                // Declare integer variable ‘ret’ used for comparison of predefined password and input password
+    myservo = 0.0;              // Initialize the position of servo motor to 0 (locked) 
+    lcd.cls();                  // Clear the LCD
+    
+    while(IR_sensor == 1){      // No obstacle detected, IR_sensor returns 1
+        LED = 0;                // Green LED turns off
+        LCD = 1;                // Backlight of LCD turns off
+    }
+    // While loop is break once the IR_sensor returns 0 which means obstacle is detected 
+    LED = 1;                        // Green LED turns on
+    LCD = 0;                        // Backlight of LCD turns on
+    lcd.printf("Welcome Home!");    // Print welcome message
+    lcd.locate(0,1);                // Print message on second line
+    lcd.printf("Enter Password.");  // Ask user to enter password
+    wait(2);                        // Wait for 2 seconds
+    lcd.cls();
+    lcd.printf("Password Entered");
+    
+    while(1) {                      // Infinite loop
+       key = keypad.ReadKey();      // Read the current key pressed from the keypad
+       
+        if (key == '\0'){           // If no key is pressed or all the keys are released
+            released = 1;}          // Set the released
+        
+        if ((key != '\0') && (released == 1)){  //If a key is pressed and previous key is released
+           if (key != old_key){                 // If the key pressed is different as the previous key
+                password[i++] = key;            // Store the input key in password string
+                lcd.locate(j++,1);              // Print the key pressed on LCD
+                lcd.printf("%c",key);
+                old_key = key;                  // Store the latest key pressed on old_key
+                released = 0;}                  // Clear the flag indicate the key is still pressed
+        }
+        
+       if (i == 4){                  // If the number of keys pressed is equal to 4
+            // Compare the input password with predefined password
+            // 4 is the number of character to be compared
+            ret = strncmp(password, pass_set, 4); 
+            wait(0.5);               // Wait for 0.5 seconds
+        }
+        
+       if (ret ==0){                        // The input password matches the predefined password
+           lcd.cls();                       // Print message on LCD
+           lcd.printf("Password Correct");
+           lcd.locate(0,1);
+           lcd.printf("Access Allowed.");
+           myservo = 1.0;                   // Rotate the servo motor to unlock the door
+           wait(2);                         // Wait for 2 seconds
+           main();                          // Jump back to main function to start everything again
+        }
+        else if (ret ==1){                  // The input password does not matches the predefined password
+           lcd.cls();                        // Print message on LCD
+           lcd.printf("Wrong Password.");
+           lcd.locate(0,1);
+           lcd.printf("Access Denied.");
+           wait(2);                         // Wait for 2 seconds
+           main();                          // Jump back to main function to start everything again
+        } 
+    }
+}
\ No newline at end of file

diff -r 000000000000 -r 754caf209809 mbed.bld
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/mbed.bld	Mon Feb 12 02:43:57 2018 +0000
@@ -0,0 +1,1 @@
+https://os.mbed.com/users/mbed_official/code/mbed/builds/7130f322cb7e
\ No newline at end of file