Intro
Intro: Password Lock with Arduino
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...
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Step 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 ...
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Step 2: Wire the Keypad to the Arduino
OK. Now that we're done with the LCD and we got it working, it's time to connect the keypad to the arduino. This can be a little tricky depending on w...
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Step 3: Preparations for the code
Before we put in the final code we have to make some modifications. https://docs.google.com/leaf?id=0B8GceIlOmvRoNWZmNWExYTMtYjVmNS00MzE5LWFlMWQtNDM3M...
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Step 4: Code
Now it's time for the code. Make sure you have all the wires in place and connect the USB cable. Upload the following code to the arduino. Copy and pa...
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
Remove these ads by 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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