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This instructable will show you how to make a pass-code lock system using the Arduino Mega board.
Whenyou type the right code, an LED lights up an the servo moves to open a lock.
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
--->one servo
This instructable will show you how to make a pass-code lock system using the Arduino Mega board.
Whenyou type the right code, an LED lights up an the servo moves to open a lock.
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
--->one servo
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Signing UpStep 1Wire 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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In file included from sketch_dec28a.cpp:1:
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Password/Password.h:33:22: error: WProgram.h: No such file or directory
In file included from sketch_dec28a.cpp:1:
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Password/Password.h:61: error: 'byte' does not name a type
In file included from sketch_dec28a.cpp:3:
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:50: error: 'byte' does not name a type
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:51: error: 'byte' does not name a type
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:63: error: 'byte' has not been declared
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:78: error: ISO C++ forbids declaration of 'byte' with no type
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:78: error: expected ';' before '*' token
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:79: error: ISO C++ forbids declaration of 'byte' with no type
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:79: error: expected ';' before '*' token
sketch_dec28a:24: error: no matching function for call to 'Keypad::Keypad(char*, byte [4], byte [3], const byte&, const byte&)'
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:63: note: candidates are: Keypad::Keypad(char*, int*, int*, int, int)
C:\Documents and Settings\Michael\My Documents\Arduino\arduino-1.0-windows[1]\arduino-1.0\libraries\Keypad/Keypad.h:57: note: Keypad::Keypad(const Keypad&)
If you're using one of these libraries, you need to install it first. To do so, download the library and unzip it. It should be in a folder of its own, and will typically contain at least two files, one with a .h suffix and one with a .cpp suffix. Open your Arduino sketchbook folder. If there is already a folder there called libraries, place the library folder in there. If not, create a folder called libraries in the sketchbook folder, and drop the library folder in there. Then re-start the Arduino programming environment, and you should see your new library in the Sketch > Import Library menu.
http://www.arduino.cc/en/Reference/Libraries
That's most likely a problem with your contrast potentiometer. If the potentiometer does not work, you may have not wired it right or maybe it is not 10KOhm. Try using a 10kohm resistor and lcd.print() something to see if it works.
Good luck!
-a small one for the keypad
-a medium one for the LCD, potentiometer, and also as a bus
-a large one for experimenting
-the servo is an RC plane servo. The same one I used on the hovercraft.
Of course if you follow the connection layout you can use solderable PCB's and make a more durable and permanent circuit. But make your first try and tests on the solderless breadboards. You can also get theese from radioshack (except for the servo). Go to the orange hyperlinks and check those out. And, good luck on your future projects! :)
I put the links in the comment (the orange words are hyperlinks ) :) go there and you'll find everything you need for your robotics/electronix projects.
The main webpage is www.robotshop.com ... It's a great website.
I hope you'll find what you need and if you need any further help don't hesitate to ask. I'll be happy to help you.