This instructable will show you how to make a pass-code lock system using the Arduino Mega board.
What you will need:
--->one Arduino Mega (the arduino uno or duemilianove does not have enough digital pins for this project)
--->one LCD module
--->one Keypad
--->one Battery pack (or you can use the USB cable and PC power)
--->one 10K Ohm potentiometer
--->four 10K Ohm resistors
---> Breadboard
---> hookup wire
What you will need:
--->one Arduino Mega (the arduino uno or duemilianove does not have enough digital pins for this project)
--->one LCD module
--->one Keypad
--->one Battery pack (or you can use the USB cable and PC power)
--->one 10K Ohm potentiometer
--->four 10K Ohm resistors
---> Breadboard
---> hookup wire
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Signing UpStep 1: Wire the LCD to the Arduino
The LCD module has 16 pins.
First of all, connect pins 1 and 16 of the LCD to the ground rail on the Breadboard
Then connect pins 2 and 15 of the LCD to the +5v rail on the breadboard
Now connect the ground rail(should be blue) of the breadboard to a ground pin on the Arduino;
Connect the +5v rail of the breadboard(this one is red) to one of the +5v pins on the Arduino board.
Now comes the contrast potentiometer which has to be connected to pin 3 of the LCD.
The potentiometer will have 3 pins. Take the middle pin and connect it to pin 3 of the arduino with hookup wire. Connect the othere two pins one to +5v and the other to GND(ground). The order does not matter.
Now let's do a test: power up the arduino. The LCD should light up. If it does then Great! If the LCD does not light up then turn off the power and check the wires.
Never change, move, or take out wires from the circuit board when the Arduino is powered up. You may permanently damage the Arduino.
If the light works rotate the potentiometer all the way to the right and all the way to the left until you see 2 rows of black squares. That's the contrast.
Now take out the power and let's hook up the LCD to the Arduino with the signal wires so we can display something on it.
Ready? Let's go!
Connect the pins as follows:
LCD Pin 4 --> Arduino Pin 2
LCD Pin 5 --> Arduino Pin 3
LCD Pin 6 --> Arduino Pin 4
LCD Pin 11 --> Arduino Pin 9
LCD Pin 12 --> Arduino Pin 10
LCD Pin 13 --> Arduino Pin 11
LCD Pin 14 --> Arduino Pin 12
And that should do it for the LCD circuit.
A test code for the the LCD: temporary.
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(2,3,4,9,10,11,12);
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("hello, world!");
}
void loop() {
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 1);
// print the number of seconds since reset:
lcd.print(millis()/1000);
}
Copy and paste it in an arduino environment window, make sure you have the board and serial port set correct and click UPLOAD after you plug in the usb with the arduino.
You will see the TX and RX led's blinking, that means the code is going to the arduino.
push the reset botton once on the arduino, tune the contrast, and you should see Hello World displayed.
Congratulations! You've got the LCD working! :)
First of all, connect pins 1 and 16 of the LCD to the ground rail on the Breadboard
Then connect pins 2 and 15 of the LCD to the +5v rail on the breadboard
Now connect the ground rail(should be blue) of the breadboard to a ground pin on the Arduino;
Connect the +5v rail of the breadboard(this one is red) to one of the +5v pins on the Arduino board.
Now comes the contrast potentiometer which has to be connected to pin 3 of the LCD.
The potentiometer will have 3 pins. Take the middle pin and connect it to pin 3 of the arduino with hookup wire. Connect the othere two pins one to +5v and the other to GND(ground). The order does not matter.
Now let's do a test: power up the arduino. The LCD should light up. If it does then Great! If the LCD does not light up then turn off the power and check the wires.
Never change, move, or take out wires from the circuit board when the Arduino is powered up. You may permanently damage the Arduino.
If the light works rotate the potentiometer all the way to the right and all the way to the left until you see 2 rows of black squares. That's the contrast.
Now take out the power and let's hook up the LCD to the Arduino with the signal wires so we can display something on it.
Ready? Let's go!
Connect the pins as follows:
LCD Pin 4 --> Arduino Pin 2
LCD Pin 5 --> Arduino Pin 3
LCD Pin 6 --> Arduino Pin 4
LCD Pin 11 --> Arduino Pin 9
LCD Pin 12 --> Arduino Pin 10
LCD Pin 13 --> Arduino Pin 11
LCD Pin 14 --> Arduino Pin 12
And that should do it for the LCD circuit.
A test code for the the LCD: temporary.
#include <LiquidCrystal.h>
// initialize the library with the numbers of the interface pins
LiquidCrystal lcd(2,3,4,9,10,11,12);
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(16, 2);
// Print a message to the LCD.
lcd.print("hello, world!");
}
void loop() {
// set the cursor to column 0, line 1
// (note: line 1 is the second row, since counting begins with 0):
lcd.setCursor(0, 1);
// print the number of seconds since reset:
lcd.print(millis()/1000);
}
Copy and paste it in an arduino environment window, make sure you have the board and serial port set correct and click UPLOAD after you plug in the usb with the arduino.
You will see the TX and RX led's blinking, that means the code is going to the arduino.
push the reset botton once on the arduino, tune the contrast, and you should see Hello World displayed.
Congratulations! You've got the LCD working! :)
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try it sometime
i have my uno driving 644 pins (leds)
2X 20x4 lcd's
2 keypads
and about 10 buttons all over the house
Thanks in advance
I hope you can help me!
Mark
I only extracted the password.h & keypad.h to Arduino/libraries.
Can you help me?
sketch_mar13a:1: error: variable or field 'keypadEvent' declared void
sketch_mar13a:1: error: 'KeypadEvent' was not declared in this scope
sketch_mar13a:4: error: 'Password' does not name a type
sketch_mar13a:21: error: 'Keypad' does not name a type
sketch_mar13a.cpp: In function 'void setup()':
sketch_mar13a:30: error: 'keypad' was not declared in this scope
sketch_mar13a:30: error: 'keypadEvent' was not declared in this scope
sketch_mar13a.cpp: In function 'void loop()':
sketch_mar13a:35: error: 'keypad' was not declared in this scope
sketch_mar13a.cpp: At global scope:
sketch_mar13a:43: error: variable or field 'keypadEvent' declared void
sketch_mar13a:43: error: 'KeypadEvent' was not declared in this scope
It looks like your libraries (Keypad and Password) are not in the right place or some of their components are missing. In the case of the Keypad library, you should have a folder called Keypad in your /Arduino/libraries. This folder should have Keypad.h and Keypad.c inside it. It may also have a folder called Examples inside it, but that's not relevant to your case. The same applies to Password. Just make sure you have that. If you don't know where the files went, just delete the Keypad and Password folders and download them again.
What the Arduino is telling you in that error message is: "What keypad?! There's a keypad on me?! I don't know how to do that.".
Let me know if that works for you.
Cheers!
So im a bit confused >.<
#include
#include
LiquidCrystal lcd(2,3,4,9,10,11,12);
Password password = Password( "4321" );
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3',},
{'4','5','6',},
{'7','8','9',},
{'*','0',' ',}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = {25, 24, 23, 22}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {28, 27, 26}; //connect to the column pinouts of the keypad
const int buttonPin = 7;
int buttonState = 0;
// Create the Keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
#define ledPin 13
void setup(){
pinMode(buttonPin, INPUT);
lcd.begin(16, 2);
digitalWrite(ledPin, LOW); // sets the LED on
Serial.begin(9600);
keypad.addEventListener(keypadEvent); //add an event listener for this keypad
keypad.setDebounceTime(250);
}
void loop(){
keypad.getKey();
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
lcd.clear();
}
}
//take care of some special events
void keypadEvent(KeypadEvent eKey){
switch (keypad.getState()){
case PRESSED:
lcd.print(eKey);
switch (eKey){
case ' ': guessPassword(); break;
default:
password.append(eKey);
}
}}
void guessPassword(){
if (password.evaluate()){
digitalWrite(ledPin,HIGH); //activates garaged door relay
delay(500);
digitalWrite(ledPin,LOW); //turns off door relay after .5 sec
lcd.print("VALID PASSWORD "); //
password.reset(); //resets password after correct entry
delay(600);
lcd.print("Welcome, Razvan");
delay(2000);
lcd.clear();
}
else{
digitalWrite(ledPin,LOW);
lcd.print("INVALID PASSWORD ");
password.reset(); //resets password after INCORRECT entry
delay(600);
lcd.clear();
}
}
Thank you very much :D
Thank's for checking it out.
Cheers!
If you want to buy one from Sparkfun, I would recommend something like this:
https://www.sparkfun.com/products/10862
FYI, I'm using the matrix keypad made for Arduino by Adafruit, http://adafru.it/419 so I'm not sure if it needs the 5V that yours needed.
In file included from arduino.cpp:6:
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Password/Password.h:33:22: error: WProgram.h: No such file or directory
In file included from arduino.cpp:6:
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Password/Password.h:61: error: 'byte' does not name a type
In file included from arduino.cpp:7:
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:50: error: 'byte' does not name a type
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:51: error: 'byte' does not name a type
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:78: error: ISO C++ forbids declaration of 'byte' with no type
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:78: error: expected ';' before '*' token
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:79: error: ISO C++ forbids declaration of 'byte' with no type
C:\Users\Kids\Documents\arduino-1.0-windows\arduino-1.0\libraries\Keypad/Keypad.h:79: error: expected ';' before '*' token
Does anyone know how to fix this? It looks like a problem within the library. Thank you.
Thanks for trying my tutorial.
From what you said, it looks like your files are not in the same place as they should be... Thy reinstalling the Arduino IDE and then put all the libraries in the correct folder and try again.
Let me know how it goes.
Good luck!
#include
#include
Password password = Password( "4321" );
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3',},
{'4','5','6',},
{'7','8','9',},
{'*','0',' ',}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = {2,3,4,9}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {10,11,12}; //connect to the column pinouts of the keypad
const int buttonPin = 7;
int buttonState = 0;
// Create the Keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
#define ledPin 13
void setup(){
pinMode(buttonPin, INPUT);
digitalWrite(ledPin, LOW); // sets the LED on
Serial.begin(9600);
//keypad.addEventListener(keypadEvent); //add an event listener for this keypad
keypad.setDebounceTime(250);
}
void loop(){
keypad.getKey();
buttonState = digitalRead(buttonPin);
}
//take care of some special events
//void keypadEvent(KeypadEvent eKey){
//switch (keypad.getState()){
//case PRESSED:
//lcd.print(eKey);
//switch (eKey){
//case ' ': guessPassword(); break;
//default:
//password.append(eKey);
//}
//}}
void guessPassword(){
if (password.evaluate()){
digitalWrite(ledPin,HIGH); //activates garaged door relay
delay(500);
digitalWrite(ledPin,LOW); //turns off door relay after .5 sec
//lcd.print("VALID PASSWORD "); //
password.reset(); //resets password after correct entry
delay(600);
//lcd.print("Welcome");
//delay(2000);
//lcd.clear();
}
else{
digitalWrite(ledPin,LOW);
//lcd.print("INVALID PASSWORD ");
password.reset(); //resets password after INCORRECT entry
delay(600);
//lcd.clear();
}
}
#include
#include
Password password = Password( "4321" );
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3',},
{'4','5','6',},
{'7','8','9',},
{'*','0',' ',}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = {25, 24, 23, 22}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {28, 27, 26}; //connect to the column pinouts of the keypad
const int buttonPin = 7;
int buttonState = 0;
// Create the Keypad
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
#define ledPin 13
void setup(){
pinMode(buttonPin, INPUT);
digitalWrite(ledPin, LOW); // sets the LED on
Serial.begin(9600);
keypad.addEventListener(keypadEvent); //add an event listener for this keypad
keypad.setDebounceTime(250);
}
void loop(){
keypad.getKey();
buttonState = digitalRead(buttonPin);
}
//take care of some special events
void keypadEvent(KeypadEvent eKey){
switch (keypad.getState()){
case PRESSED:
lcd.print(eKey);
switch (eKey){
case ' ': guessPassword(); break;
default:
password.append(eKey);
}
}}
void guessPassword(){
if (password.evaluate()){
digitalWrite(ledPin,HIGH); //activates garaged door relay
delay(500);
digitalWrite(ledPin,LOW); //turns off door relay after .5 sec
password.reset(); //resets password after correct entry
delay(600);
}
else{
digitalWrite(ledPin,LOW);
password.reset(); //resets password after INCORRECT entry
delay(600);
}
}
only import Password.h and Keypad.h
I used LiquidCrystal_SR.h Library which can be found here:
https://bitbucket.org/fmalpartida/new-liquidcrystal/overview
Also check out this post for more info on the shift register Library:
http://arduino.cc/forum/index.php/topic,90526.0.html
#include <Keypad.h>
#include <LiquidCrystal_SR.h>
Password password = Password( "4321" );
const byte ROWS = 4; // Four rows
const byte COLS = 3; // Three columns
// Define the Keymap
char keys[ROWS][COLS] = {
{'1','2','3',},
{'4','5','6',},
{'7','8','9',},
{'*','0',' ',}
};
// Connect keypad ROW0, ROW1, ROW2 and ROW3 to these Arduino pins.
byte rowPins[ROWS] = {5, 6, 7, 8}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {9, 10, 11}; //connect to the column pinouts of the keypad
const int buttonPin = 12;
int buttonState = 0;
#define DATAPIN 2
#define CLOCKPIN 4
#define STROBEPIN 3
#define MAXCOLUMNS 16
#define MAXLINES 2
#define ledPin 13
Keypad keypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS );
LiquidCrystal_SR lcd(DATAPIN, CLOCKPIN, STROBEPIN);
void setup() {
pinMode(ledPin, OUTPUT);
pinMode(buttonPin, INPUT);
// set up the LCD's number of rows and columns:
lcd.begin(MAXCOLUMNS, MAXLINES);
digitalWrite(ledPin, LOW);
Serial.begin(9600);
keypad.addEventListener(keypadEvent); //add an event listener for this keypad
keypad.setDebounceTime(250);
}
void loop(){
keypad.getKey();
buttonState = digitalRead(buttonPin);
if (buttonState == HIGH) {
lcd.clear();
}
}
void keypadEvent(KeypadEvent eKey){
switch (keypad.getState()){
case PRESSED:
lcd.print(eKey);
switch (eKey){
case ' ': guessPassword(); break;
default:
password.append(eKey);
}
}}
void guessPassword(){
if (password.evaluate()){
digitalWrite(ledPin,HIGH); //activates garaged door relay
delay(500);
digitalWrite(ledPin,LOW); //turns off door relay after .5 sec
lcd.print("VALID PASSWORD "); //
password.reset(); //resets password after correct entry
delay(600);
lcd.print("Welcome");
delay(2000);
lcd.clear();
}
else{
digitalWrite(ledPin,LOW);
lcd.print("INVALID PASSWORD ");
password.reset(); //resets password after INCORRECT entry
delay(600);
lcd.clear();
}
}
add a momentary ( regular button) to the circuit. hook it up to a free digital pin.
in the code add the following:
if (digitalRead(buttonPin) == HIGH){
// open your door
delay( x ) // replace x with how much u want the lock to stay open
// lock the door
}