PO Box Combination Lock w/servo

Uses potentiometer and joystick for input of combination. Three 1 or two characters are each step in the combo with 8000 permutations.

Feb 12, 2022

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Components and supplies

Rotary potentiometer (generic)

Analog joystick (Generic)

Arduino Mega 2560

Servo Module (Generic)

Alphanumeric LCD, 20 x 4

Tools and machines

3D Printer (generic)

Apps and platforms

Arduino IDE

TinkerCAD

Project description

Code

Running framework for your code and functional sub for combo lock

arduino

This is the minimum required code to implement a three character PO Box combination lock - add to your own code

1//
2// Code excerpt from larger working sketch
3// Copyright 2022   - Mark M. Lambert - Free Use with attribution
4//
5// Simulate a PO box lock.
6//   Turn pot to dial setting
7// Click Joystick to enter #
8//
9// Presumes 20x4   LCD
10//
11const int LCD_COLS = 20;
12const int LCD_ROWS = 4;
13//
14// Define   strings for PO Box Combo Lock simulator
15// 20 lock postitions
16//
17// Combination   dial is pot on A15
18//
19const int Wiper   = A15;    //Wiper from 5k pot
20//
21//   Servo needs a PWM output. Powered by Aux +5
22//
23const int PWM1      =  9;   //   Big servo
24//
25// Servo angles for locking mechanism - see CAD drawing
26//
27const   int LockAngle = 15;
28const int UnLockAngle = LockAngle + 79;   //Desired rotation   angle to open door from CAD
29const int MidAngle = (LockAngle + UnLockAngle) /2;
30//
31//   Joystick switch
32//
33const int Zaxis     = 44;       // Joystick Z (push sw)
34//
35//   Key codes
36//
37char *LockTable[] = {
38      "A", 
39      "A-B", 
40       "B", 
41      "B-C", 
42      "C", 
43      "C-D", 
44      "D",   
45      "D-E", 
46      "E", 
47      "E-F", 
48      "F", 
49      "F-G",   
50      "G", 
51      "G-H", 
52      "H", 
53      "H-I", 
54      "I",   
55      "I-J", 
56      "J", 
57      "J-A"
58    };
59//
60const String   LockCombo = "ECB";   // Min combo is three chars
61String LockEntryA;      //   These could be combined but are separated for
62String LockEntryB;      // easy   test
63String LockEntryC;
64String LockEntry;       // Combined string
65//    
66//   Code snippet begins with minimum needed includes
67//
68#include <Wire.h>               //I2C   Driver
69#include <LiquidCrystal_I2C.h>  //I2C LCD display driver for all LCD's
70#include   <Servo.h>              //PWM Servo motorServo DoorServo;  // create servo object   to control large servo
71//
72// 0x27 is default address for I2C 20x4 LCD displays   - adjust accordingly
73//
74LiquidCrystal_I2C lcd(0x27, LCD_COLS, LCD_ROWS);  //   set the LCD object address to 0x27 and for a 20 chars and 4 line display
75//
76Servo   DoorServo;  // create servo object to control large servo
77//
78void setup()
79   {
80  Serial.begin(9600);       //Warm up comm port
81  //
82  pinMode(Zaxis,   INPUT_PULLUP);   // Push sw on joystick
83  lcd.init();  //initialize the lcd
84   }
85//
86// you will have your own code here to call this routine
87// 
88void   loop()
89  {
90    // Your code goes here
91  }
92// =======================
93//
94//   Door lock sub
95//
96void comboLock()
97  {
98  lcd.clear();
99  lcd.backlight();
100   //
101  lcd.print("PO Box Sim");
102  lcd.setCursor(0, 1);
103  lcd.print("First   Code &");
104  lcd.setCursor(0, 2);
105  lcd.print("Press Joystick Btn:");
106   lcd.setCursor(0, 3);
107  lcd.print("Code: ");
108  //
109  while (digitalRead(Zaxis)   != 0)
110    {
111      //
112      // show live reading - 3 chars
113      //
114       lcd.setCursor(6, 3);
115      lcd.print("   ");
116      lcd.setCursor(6,   3);
117      //
118      // We wanna map 0-1023 to 0-19 & display
119      // letters
120       //              
121      lcd.print(LockTable[ map( analogRead(Wiper), 0,   1023, 0, 19) ] );
122      //
123      delay(20);  //Reduce display flicker
124     }
125  loop;
126  // 
127  // Wait fast for button release
128  //
129  while   (digitalRead(Zaxis) == 0)
130    {
131    }
132  loop;
133  //
134  // Button released,   use last reading
135  //
136  LockEntryA = LockTable[map( analogRead(Wiper), 0,   1023, 0, 19)];
137  //
138  lcd.clear();
139  lcd.print("PO Box Sim");
140  lcd.setCursor(0,   1);
141  lcd.print("Second Code &");
142  lcd.setCursor(0, 2);
143  lcd.print("Press   Joystick Btn:");
144  lcd.setCursor(0, 3);
145  lcd.print("Code: ");
146  //
147   while (digitalRead(Zaxis) != 0)
148    {
149      //
150      // show live reading   - 3 chars
151      //
152      lcd.setCursor(6, 3);
153      lcd.print("   ");
154       lcd.setCursor(6, 3);
155      //
156      // We wanna map 0-1023 to 0-19 &   display
157      // letters
158      //              
159      lcd.print(LockTable[   map( analogRead(Wiper), 0, 1023, 0, 19) ] );
160      //
161      delay(20);  //Reduce   display flicker
162    }
163  loop;
164  // 
165  // Wait fast for button release
166   //
167  while (digitalRead(Zaxis) == 0)
168    {
169    }
170  loop;
171  //
172   // Button released, use last reading
173  //
174  LockEntryB = LockTable[ map(   analogRead(Wiper), 0, 1023, 0, 19)] ;
175  //
176  lcd.clear();
177  lcd.print("PO   Box Sim");
178  lcd.setCursor(0, 1);
179  lcd.print("Final Code &");
180  lcd.setCursor(0,   2);
181  lcd.print("Press Joystick Btn:");
182  lcd.setCursor(0, 3);
183  lcd.print("Code:   ");
184  //
185  while (digitalRead(Zaxis) != 0)
186    {
187      //
188      //   show live reading - 3 chars
189      //
190      lcd.setCursor(6, 3);
191      lcd.print("    ");
192      lcd.setCursor(6, 3);
193      //
194      // We wanna map 0-1023   to 0-19 & display
195      // letters
196      //              
197      lcd.print(LockTable[   map( analogRead(Wiper), 0, 1023, 0, 19) ] );
198      //
199      delay(20);  //Reduce   display flicker
200    }
201  loop;
202  // 
203  // Wait fast for button release
204   //
205  while (digitalRead(Zaxis) == 0)
206    {
207    }
208  loop;
209  //
210   // Button released, use last reading
211  //
212  LockEntryC = LockTable[map(   analogRead(Wiper), 0, 1023, 0, 19) ];
213  //
214  lcd.clear();
215  lcd.print("PO   Box Sim");
216  lcd.setCursor(0, 1);
217  lcd.print("Code: ");
218  lcd.print(LockEntryA);
219   lcd.print(" ");
220  lcd.print(LockEntryB);
221  lcd.print(" ");
222  lcd.print(LockEntryC);
223   lcd.setCursor(1, 2);
224  // 
225  LockEntry = LockEntryA;
226  LockEntry += LockEntryB;
227   LockEntry += LockEntryC;
228  Serial.print(" Entered: ");
229  Serial.println(LockEntry);
230   Serial.print("Required: ");
231  Serial.println(LockCombo);
232  //
233  if   (LockEntry == LockCombo)
234    {
235    lcd.print("Access GRANTED.");
236    DoorServo.write(UnLockAngle);
237     delay(3000);
238    DoorServo.write(LockAngle);
239    }
240  else
241    {
242     lcd.print("ACCESS DENIED!");              
243    delay(3000);
244    }
245   //
246  lcd.clear();
247  //
248  }
249// ========================
250// FIN
251//   ========================
252

//
// Code excerpt from larger working sketch
// Copyright 2022   - Mark M. Lambert - Free Use with attribution
//
// Simulate a PO box lock.
//   Turn pot to dial setting
// Click Joystick to enter #
//
// Presumes 20x4   LCD
//
const int LCD_COLS = 20;
const int LCD_ROWS = 4;
//
// Define   strings for PO Box Combo Lock simulator
// 20 lock postitions
//
// Combination   dial is pot on A15
//
const int Wiper   = A15;    //Wiper from 5k pot
//
//   Servo needs a PWM output. Powered by Aux +5
//
const int PWM1      =  9;   //   Big servo
//
// Servo angles for locking mechanism - see CAD drawing
//
const   int LockAngle = 15;
const int UnLockAngle = LockAngle + 79;   //Desired rotation   angle to open door from CAD
const int MidAngle = (LockAngle + UnLockAngle) /2;
//
//   Joystick switch
//
const int Zaxis     = 44;       // Joystick Z (push sw)
//
//   Key codes
//
char *LockTable[] = {
      "A", 
      "A-B", 
       "B", 
      "B-C", 
      "C", 
      "C-D", 
      "D",   
      "D-E", 
      "E", 
      "E-F", 
      "F", 
      "F-G",   
      "G", 
      "G-H", 
      "H", 
      "H-I", 
      "I",   
      "I-J", 
      "J", 
      "J-A"
    };
//
const String   LockCombo = "ECB";   // Min combo is three chars
String LockEntryA;      //   These could be combined but are separated for
String LockEntryB;      // easy   test
String LockEntryC;
String LockEntry;       // Combined string
//    
//   Code snippet begins with minimum needed includes
//
#include <Wire.h>               //I2C   Driver
#include <LiquidCrystal_I2C.h>  //I2C LCD display driver for all LCD's
#include   <Servo.h>              //PWM Servo motorServo DoorServo;  // create servo object   to control large servo
//
// 0x27 is default address for I2C 20x4 LCD displays   - adjust accordingly
//
LiquidCrystal_I2C lcd(0x27, LCD_COLS, LCD_ROWS);  //   set the LCD object address to 0x27 and for a 20 chars and 4 line display
//
Servo   DoorServo;  // create servo object to control large servo
//
void setup()
   {
  Serial.begin(9600);       //Warm up comm port
  //
  pinMode(Zaxis,   INPUT_PULLUP);   // Push sw on joystick
  lcd.init();  //initialize the lcd
   }
//
// you will have your own code here to call this routine
// 
void   loop()
  {
    // Your code goes here
  }
// =======================
//
//   Door lock sub
//
void comboLock()
  {
  lcd.clear();
  lcd.backlight();
   //
  lcd.print("PO Box Sim");
  lcd.setCursor(0, 1);
  lcd.print("First   Code &");
  lcd.setCursor(0, 2);
  lcd.print("Press Joystick Btn:");
   lcd.setCursor(0, 3);
  lcd.print("Code: ");
  //
  while (digitalRead(Zaxis)   != 0)
    {
      //
      // show live reading - 3 chars
      //
       lcd.setCursor(6, 3);
      lcd.print("   ");
      lcd.setCursor(6,   3);
      //
      // We wanna map 0-1023 to 0-19 & display
      // letters
       //              
      lcd.print(LockTable[ map( analogRead(Wiper), 0,   1023, 0, 19) ] );
      //
      delay(20);  //Reduce display flicker
     }
  loop;
  // 
  // Wait fast for button release
  //
  while   (digitalRead(Zaxis) == 0)
    {
    }
  loop;
  //
  // Button released,   use last reading
  //
  LockEntryA = LockTable[map( analogRead(Wiper), 0,   1023, 0, 19)];
  //
  lcd.clear();
  lcd.print("PO Box Sim");
  lcd.setCursor(0,   1);
  lcd.print("Second Code &");
  lcd.setCursor(0, 2);
  lcd.print("Press   Joystick Btn:");
  lcd.setCursor(0, 3);
  lcd.print("Code: ");
  //
   while (digitalRead(Zaxis) != 0)
    {
      //
      // show live reading   - 3 chars
      //
      lcd.setCursor(6, 3);
      lcd.print("   ");
       lcd.setCursor(6, 3);
      //
      // We wanna map 0-1023 to 0-19 &   display
      // letters
      //              
      lcd.print(LockTable[   map( analogRead(Wiper), 0, 1023, 0, 19) ] );
      //
      delay(20);  //Reduce   display flicker
    }
  loop;
  // 
  // Wait fast for button release
   //
  while (digitalRead(Zaxis) == 0)
    {
    }
  loop;
  //
   // Button released, use last reading
  //
  LockEntryB = LockTable[ map(   analogRead(Wiper), 0, 1023, 0, 19)] ;
  //
  lcd.clear();
  lcd.print("PO   Box Sim");
  lcd.setCursor(0, 1);
  lcd.print("Final Code &");
  lcd.setCursor(0,   2);
  lcd.print("Press Joystick Btn:");
  lcd.setCursor(0, 3);
  lcd.print("Code:   ");
  //
  while (digitalRead(Zaxis) != 0)
    {
      //
      //   show live reading - 3 chars
      //
      lcd.setCursor(6, 3);
      lcd.print("    ");
      lcd.setCursor(6, 3);
      //
      // We wanna map 0-1023   to 0-19 & display
      // letters
      //              
      lcd.print(LockTable[   map( analogRead(Wiper), 0, 1023, 0, 19) ] );
      //
      delay(20);  //Reduce   display flicker
    }
  loop;
  // 
  // Wait fast for button release
   //
  while (digitalRead(Zaxis) == 0)
    {
    }
  loop;
  //
   // Button released, use last reading
  //
  LockEntryC = LockTable[map(   analogRead(Wiper), 0, 1023, 0, 19) ];
  //
  lcd.clear();
  lcd.print("PO   Box Sim");
  lcd.setCursor(0, 1);
  lcd.print("Code: ");
  lcd.print(LockEntryA);
   lcd.print(" ");
  lcd.print(LockEntryB);
  lcd.print(" ");
  lcd.print(LockEntryC);
   lcd.setCursor(1, 2);
  // 
  LockEntry = LockEntryA;
  LockEntry += LockEntryB;
   LockEntry += LockEntryC;
  Serial.print(" Entered: ");
  Serial.println(LockEntry);
   Serial.print("Required: ");
  Serial.println(LockCombo);
  //
  if   (LockEntry == LockCombo)
    {
    lcd.print("Access GRANTED.");
    DoorServo.write(UnLockAngle);
     delay(3000);
    DoorServo.write(LockAngle);
    }
  else
    {
     lcd.print("ACCESS DENIED!");              
    delay(3000);
    }
   //
  lcd.clear();
  //
  }
// ========================
// FIN
//   ========================

Running framework for your code and functional sub for combo lock

arduino

This is the minimum required code to implement a three character PO Box combination lock - add to your own code

1//
2// Code excerpt from larger working sketch
3// Copyright 2022  - Mark M. Lambert - Free Use with attribution
4//
5// Simulate a PO box lock.
6//  Turn pot to dial setting
7// Click Joystick to enter #
8//
9// Presumes 20x4  LCD
10//
11const int LCD_COLS = 20;
12const int LCD_ROWS = 4;
13//
14// Define  strings for PO Box Combo Lock simulator
15// 20 lock postitions
16//
17// Combination  dial is pot on A15
18//
19const int Wiper   = A15;    //Wiper from 5k pot
20//
21//  Servo needs a PWM output. Powered by Aux +5
22//
23const int PWM1      =  9;   //  Big servo
24//
25// Servo angles for locking mechanism - see CAD drawing
26//
27const  int LockAngle = 15;
28const int UnLockAngle = LockAngle + 79;   //Desired rotation  angle to open door from CAD
29const int MidAngle = (LockAngle + UnLockAngle) /2;
30//
31//  Joystick switch
32//
33const int Zaxis     = 44;       // Joystick Z (push sw)
34//
35//  Key codes
36//
37char *LockTable[] = {
38      "A", 
39      "A-B", 
40      "B", 
41      "B-C", 
42      "C", 
43      "C-D", 
44      "D",  
45      "D-E", 
46      "E", 
47      "E-F", 
48      "F", 
49      "F-G",  
50      "G", 
51      "G-H", 
52      "H", 
53      "H-I", 
54      "I",  
55      "I-J", 
56      "J", 
57      "J-A"
58    };
59//
60const String  LockCombo = "ECB";   // Min combo is three chars
61String LockEntryA;      //  These could be combined but are separated for
62String LockEntryB;      // easy  test
63String LockEntryC;
64String LockEntry;       // Combined string
65//    
66//  Code snippet begins with minimum needed includes
67//
68#include <Wire.h>               //I2C  Driver
69#include <LiquidCrystal_I2C.h>  //I2C LCD display driver for all LCD's
70#include  <Servo.h>              //PWM Servo motorServo DoorServo;  // create servo object  to control large servo
71//
72// 0x27 is default address for I2C 20x4 LCD displays  - adjust accordingly
73//
74LiquidCrystal_I2C lcd(0x27, LCD_COLS, LCD_ROWS);  //  set the LCD object address to 0x27 and for a 20 chars and 4 line display
75//
76Servo  DoorServo;  // create servo object to control large servo
77//
78void setup()
79  {
80  Serial.begin(9600);       //Warm up comm port
81  //
82  pinMode(Zaxis,  INPUT_PULLUP);   // Push sw on joystick
83  lcd.init();  //initialize the lcd
84  }
85//
86// you will have your own code here to call this routine
87// 
88void  loop()
89  {
90    // Your code goes here
91  }
92// =======================
93//
94//  Door lock sub
95//
96void comboLock()
97  {
98  lcd.clear();
99  lcd.backlight();
100  //
101  lcd.print("PO Box Sim");
102  lcd.setCursor(0, 1);
103  lcd.print("First  Code &");
104  lcd.setCursor(0, 2);
105  lcd.print("Press Joystick Btn:");
106  lcd.setCursor(0, 3);
107  lcd.print("Code: ");
108  //
109  while (digitalRead(Zaxis)  != 0)
110    {
111      //
112      // show live reading - 3 chars
113      //
114      lcd.setCursor(6, 3);
115      lcd.print("   ");
116      lcd.setCursor(6,  3);
117      //
118      // We wanna map 0-1023 to 0-19 & display
119      // letters
120      //              
121      lcd.print(LockTable[ map( analogRead(Wiper), 0,  1023, 0, 19) ] );
122      //
123      delay(20);  //Reduce display flicker
124    }
125  loop;
126  // 
127  // Wait fast for button release
128  //
129  while  (digitalRead(Zaxis) == 0)
130    {
131    }
132  loop;
133  //
134  // Button released,  use last reading
135  //
136  LockEntryA = LockTable[map( analogRead(Wiper), 0,  1023, 0, 19)];
137  //
138  lcd.clear();
139  lcd.print("PO Box Sim");
140  lcd.setCursor(0,  1);
141  lcd.print("Second Code &");
142  lcd.setCursor(0, 2);
143  lcd.print("Press  Joystick Btn:");
144  lcd.setCursor(0, 3);
145  lcd.print("Code: ");
146  //
147  while (digitalRead(Zaxis) != 0)
148    {
149      //
150      // show live reading  - 3 chars
151      //
152      lcd.setCursor(6, 3);
153      lcd.print("   ");
154      lcd.setCursor(6, 3);
155      //
156      // We wanna map 0-1023 to 0-19 &  display
157      // letters
158      //              
159      lcd.print(LockTable[  map( analogRead(Wiper), 0, 1023, 0, 19) ] );
160      //
161      delay(20);  //Reduce  display flicker
162    }
163  loop;
164  // 
165  // Wait fast for button release
166  //
167  while (digitalRead(Zaxis) == 0)
168    {
169    }
170  loop;
171  //
172  // Button released, use last reading
173  //
174  LockEntryB = LockTable[ map(  analogRead(Wiper), 0, 1023, 0, 19)] ;
175  //
176  lcd.clear();
177  lcd.print("PO  Box Sim");
178  lcd.setCursor(0, 1);
179  lcd.print("Final Code &");
180  lcd.setCursor(0,  2);
181  lcd.print("Press Joystick Btn:");
182  lcd.setCursor(0, 3);
183  lcd.print("Code:  ");
184  //
185  while (digitalRead(Zaxis) != 0)
186    {
187      //
188      //  show live reading - 3 chars
189      //
190      lcd.setCursor(6, 3);
191      lcd.print("   ");
192      lcd.setCursor(6, 3);
193      //
194      // We wanna map 0-1023  to 0-19 & display
195      // letters
196      //              
197      lcd.print(LockTable[  map( analogRead(Wiper), 0, 1023, 0, 19) ] );
198      //
199      delay(20);  //Reduce  display flicker
200    }
201  loop;
202  // 
203  // Wait fast for button release
204  //
205  while (digitalRead(Zaxis) == 0)
206    {
207    }
208  loop;
209  //
210  // Button released, use last reading
211  //
212  LockEntryC = LockTable[map(  analogRead(Wiper), 0, 1023, 0, 19) ];
213  //
214  lcd.clear();
215  lcd.print("PO  Box Sim");
216  lcd.setCursor(0, 1);
217  lcd.print("Code: ");
218  lcd.print(LockEntryA);
219  lcd.print(" ");
220  lcd.print(LockEntryB);
221  lcd.print(" ");
222  lcd.print(LockEntryC);
223  lcd.setCursor(1, 2);
224  // 
225  LockEntry = LockEntryA;
226  LockEntry += LockEntryB;
227  LockEntry += LockEntryC;
228  Serial.print(" Entered: ");
229  Serial.println(LockEntry);
230  Serial.print("Required: ");
231  Serial.println(LockCombo);
232  //
233  if  (LockEntry == LockCombo)
234    {
235    lcd.print("Access GRANTED.");
236    DoorServo.write(UnLockAngle);
237    delay(3000);
238    DoorServo.write(LockAngle);
239    }
240  else
241    {
242    lcd.print("ACCESS DENIED!");              
243    delay(3000);
244    }
245  //
246  lcd.clear();
247  //
248  }
249// ========================
250// FIN
251//  ========================
252

//
// Code excerpt from larger working sketch
// Copyright 2022  - Mark M. Lambert - Free Use with attribution
//
// Simulate a PO box lock.
//  Turn pot to dial setting
// Click Joystick to enter #
//
// Presumes 20x4  LCD
//
const int LCD_COLS = 20;
const int LCD_ROWS = 4;
//
// Define  strings for PO Box Combo Lock simulator
// 20 lock postitions
//
// Combination  dial is pot on A15
//
const int Wiper   = A15;    //Wiper from 5k pot
//
//  Servo needs a PWM output. Powered by Aux +5
//
const int PWM1      =  9;   //  Big servo
//
// Servo angles for locking mechanism - see CAD drawing
//
const  int LockAngle = 15;
const int UnLockAngle = LockAngle + 79;   //Desired rotation  angle to open door from CAD
const int MidAngle = (LockAngle + UnLockAngle) /2;
//
//  Joystick switch
//
const int Zaxis     = 44;       // Joystick Z (push sw)
//
//  Key codes
//
char *LockTable[] = {
      "A", 
      "A-B", 
      "B", 
      "B-C", 
      "C", 
      "C-D", 
      "D",  
      "D-E", 
      "E", 
      "E-F", 
      "F", 
      "F-G",  
      "G", 
      "G-H", 
      "H", 
      "H-I", 
      "I",  
      "I-J", 
      "J", 
      "J-A"
    };
//
const String  LockCombo = "ECB";   // Min combo is three chars
String LockEntryA;      //  These could be combined but are separated for
String LockEntryB;      // easy  test
String LockEntryC;
String LockEntry;       // Combined string
//    
//  Code snippet begins with minimum needed includes
//
#include <Wire.h>               //I2C  Driver
#include <LiquidCrystal_I2C.h>  //I2C LCD display driver for all LCD's
#include  <Servo.h>              //PWM Servo motorServo DoorServo;  // create servo object  to control large servo
//
// 0x27 is default address for I2C 20x4 LCD displays  - adjust accordingly
//
LiquidCrystal_I2C lcd(0x27, LCD_COLS, LCD_ROWS);  //  set the LCD object address to 0x27 and for a 20 chars and 4 line display
//
Servo  DoorServo;  // create servo object to control large servo
//
void setup()
  {
  Serial.begin(9600);       //Warm up comm port
  //
  pinMode(Zaxis,  INPUT_PULLUP);   // Push sw on joystick
  lcd.init();  //initialize the lcd
  }
//
// you will have your own code here to call this routine
// 
void  loop()
  {
    // Your code goes here
  }
// =======================
//
//  Door lock sub
//
void comboLock()
  {
  lcd.clear();
  lcd.backlight();
  //
  lcd.print("PO Box Sim");
  lcd.setCursor(0, 1);
  lcd.print("First  Code &");
  lcd.setCursor(0, 2);
  lcd.print("Press Joystick Btn:");
  lcd.setCursor(0, 3);
  lcd.print("Code: ");
  //
  while (digitalRead(Zaxis)  != 0)
    {
      //
      // show live reading - 3 chars
      //
      lcd.setCursor(6, 3);
      lcd.print("   ");
      lcd.setCursor(6,  3);
      //
      // We wanna map 0-1023 to 0-19 & display
      // letters
      //              
      lcd.print(LockTable[ map( analogRead(Wiper), 0,  1023, 0, 19) ] );
      //
      delay(20);  //Reduce display flicker
    }
  loop;
  // 
  // Wait fast for button release
  //
  while  (digitalRead(Zaxis) == 0)
    {
    }
  loop;
  //
  // Button released,  use last reading
  //
  LockEntryA = LockTable[map( analogRead(Wiper), 0,  1023, 0, 19)];
  //
  lcd.clear();
  lcd.print("PO Box Sim");
  lcd.setCursor(0,  1);
  lcd.print("Second Code &");
  lcd.setCursor(0, 2);
  lcd.print("Press  Joystick Btn:");
  lcd.setCursor(0, 3);
  lcd.print("Code: ");
  //
  while (digitalRead(Zaxis) != 0)
    {
      //
      // show live reading  - 3 chars
      //
      lcd.setCursor(6, 3);
      lcd.print("   ");
      lcd.setCursor(6, 3);
      //
      // We wanna map 0-1023 to 0-19 &  display
      // letters
      //              
      lcd.print(LockTable[  map( analogRead(Wiper), 0, 1023, 0, 19) ] );
      //
      delay(20);  //Reduce  display flicker
    }
  loop;
  // 
  // Wait fast for button release
  //
  while (digitalRead(Zaxis) == 0)
    {
    }
  loop;
  //
  // Button released, use last reading
  //
  LockEntryB = LockTable[ map(  analogRead(Wiper), 0, 1023, 0, 19)] ;
  //
  lcd.clear();
  lcd.print("PO  Box Sim");
  lcd.setCursor(0, 1);
  lcd.print("Final Code &");
  lcd.setCursor(0,  2);
  lcd.print("Press Joystick Btn:");
  lcd.setCursor(0, 3);
  lcd.print("Code:  ");
  //
  while (digitalRead(Zaxis) != 0)
    {
      //
      //  show live reading - 3 chars
      //
      lcd.setCursor(6, 3);
      lcd.print("   ");
      lcd.setCursor(6, 3);
      //
      // We wanna map 0-1023  to 0-19 & display
      // letters
      //              
      lcd.print(LockTable[  map( analogRead(Wiper), 0, 1023, 0, 19) ] );
      //
      delay(20);  //Reduce  display flicker
    }
  loop;
  // 
  // Wait fast for button release
  //
  while (digitalRead(Zaxis) == 0)
    {
    }
  loop;
  //
  // Button released, use last reading
  //
  LockEntryC = LockTable[map(  analogRead(Wiper), 0, 1023, 0, 19) ];
  //
  lcd.clear();
  lcd.print("PO  Box Sim");
  lcd.setCursor(0, 1);
  lcd.print("Code: ");
  lcd.print(LockEntryA);
  lcd.print(" ");
  lcd.print(LockEntryB);
  lcd.print(" ");
  lcd.print(LockEntryC);
  lcd.setCursor(1, 2);
  // 
  LockEntry = LockEntryA;
  LockEntry += LockEntryB;
  LockEntry += LockEntryC;
  Serial.print(" Entered: ");
  Serial.println(LockEntry);
  Serial.print("Required: ");
  Serial.println(LockCombo);
  //
  if  (LockEntry == LockCombo)
    {
    lcd.print("Access GRANTED.");
    DoorServo.write(UnLockAngle);
    delay(3000);
    DoorServo.write(LockAngle);
    }
  else
    {
    lcd.print("ACCESS DENIED!");              
    delay(3000);
    }
  //
  lcd.clear();
  //
  }
// ========================
// FIN
//  ========================

Downloadable files

Gadget block diagram - DOESN'T MATCH PINS IN CODE

Basic schematic with available components on TinkerCad. Match Z-axis DI wired to value in code.

Gadget block diagram - DOESN'T MATCH PINS IN CODE

KY-023 Joystick

LCD2004 I2C Address Jumpers

I2C addressing jumpering

LCD2004 I2C Address Jumpers

Door Linkage

How servo rotation angles were determined

Door Linkage

KY-023 Joystick

LCD2004 I2C Address Jumpers

I2C addressing jumpering

LCD2004 I2C Address Jumpers

Door Linkage

How servo rotation angles were determined

Door Linkage

Gadget block diagram - DOESN'T MATCH PINS IN CODE

Basic schematic with available components on TinkerCad. Match Z-axis DI wired to value in code.

Gadget block diagram - DOESN'T MATCH PINS IN CODE

Documentation

Large Servo Mount 3D .STL print file

This mounts a large (3/4" x 1-9/16") servo. It has cable exit holes on both sides so the servo can be mounted in either direction. the base had f #6 thru holes for mounting. The servo attaches with four 6-32 x 1/2 screws. You should tap the four holes 6-32 before use.

Large Servo Mount 3D .STL print file

5/16" shaft mini potentiometer 8-way mount - 3D .STL print file

Mounts any standard 5/16" shaft mini potentiometer commonly found in Arduino starter kits. Has four anti-rotation holes sized to fit the tab on the pot. Allows mounting in any of four positions from either side for universal 8-way mounting.

5/16" shaft mini potentiometer 8-way mount - 3D .STL print file

20 x 4 LCD front side panel mount - 3D .STL print file

Use this to mount 2004A type LCD displays

20 x 4 LCD front side panel mount - 3D .STL print file

DuPont 5 station slip on connector shroud 3D .STL print file

Slips over cable to change five loose DuPont connections into a single, unified, connector.

DuPont 5 station slip on connector shroud 3D .STL print file

Door pivot for far end of servo 3D .STL print file

Servo arm has 1/16" dia holes for connecting rod. This little piece has a matching 1/16" hole and two #6 thru holes for mounting on the door.

Door pivot for far end of servo 3D .STL print file

Arduino Uno/Mega 2560 wide mount for screw shield clearance - 3D .STL print file

Mounts Uno/Mega

Arduino Uno/Mega 2560 wide mount for screw shield clearance - 3D .STL print file

20 x 4 LCD front side panel mount - 3D .STL print file

Use this to mount 2004A type LCD displays

20 x 4 LCD front side panel mount - 3D .STL print file

Arduino Uno/Mega 2560 wide mount for screw shield clearance - 3D .STL print file

Mounts Uno/Mega

Arduino Uno/Mega 2560 wide mount for screw shield clearance - 3D .STL print file

DuPont 5 station slip on connector shroud 3D .STL print file

Slips over cable to change five loose DuPont connections into a single, unified, connector.

DuPont 5 station slip on connector shroud 3D .STL print file

Large Servo Mount 3D .STL print file

5/16" shaft mini potentiometer 8-way mount - 3D .STL print file

Door pivot for far end of servo 3D .STL print file

Servo arm has 1/16" dia holes for connecting rod. This little piece has a matching 1/16" hole and two #6 thru holes for mounting on the door.

Door pivot for far end of servo 3D .STL print file

KY-023 Joystick Case 3D .STL print file

This mounts a standard Arduino starter kit KY-023 joystick. Four holes are to be tapped 4-40 for mounting the joystick. The top cover mounts with four 6-32 screws and ca be used without tapping, do not over torque! A cable outlet is provided large enough to a five wire DUPONT5 connector shroud.

KY-023 Joystick Case 3D .STL print file

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