This a door lock built as fun project. It is quite easy to build and a fun way to learn and improve your knowledge of Arduino. I tried to add a 16*2 display but there weren’t enough GPIO pins on Arduino Uno. If You are interested in adding a display you would need an Arduino Mega.
Items Needed
Arduino UNO
Jumper wires
Servo(or any other component to open a door lock like a linear actuator)
Keypad(I used a 4*3 keypad)
Pushbutton
Resistor(1k or 2k)
Breadboard
Get your Code
Get your code from- https://github.com/Vulcan-Dynamyte/ArdLock
Tip-You can use a 4*4 keypad too just by not using the last column.
Installing the library
Copy the keypad folder to Library folder under Arduino folder(under>program files>Arduino) .
Step 1: Connecting the Keypad to Arduino
At first you would like to connect a keypad and test if it is working flawlessly and to check your connections.
Connect your keypad through keypad pins to Arduino pins 3 to 9(row pins to 3-6)(column pins to 7-9).You can verify your connections by seeing the color code of wires used.
Seeing the output
Use the Hello_keypad.ino code from the library to test for proper connections.(file>examples>Keypad(scrolldown)>hello_keypad)This code gives the button pressed on the serial monitor.
First you open the code in Arduino IDE and then upload it onto your Arduino, then open the serial Monitor(button on the upper right corner).Then test by pressing a button and then observing the input on the serial monitor.
Tips for the main code
In the main code the previous character is deleted by pressing the * key.
Step 2: Building the Button
Do not remove the connections to the keypad while testing the button.
Our doorlock has a button to open or close a door from the inside. I built it using a pushbutton. As Arduino reads voltages form a closed circuit we create a Circuit with a resistor.
The code to test if the button works is given in this segment.
Test the code before going forward.
Read more: ArdLock – Build An Arduino Door Lock
