How to use a Keypad - Arduino Tutorial

We are known very well about Keypad which is the combinations of buttons arranged in manner like a block or pad. A keypad usually had digits, symbols and the set of alphabetical letters. If we using mostly numbers then this keypad is called Numeric keypad. Keypads can be found in many alphanumeric keyboards and other devices such as calculators, push-button telephones, combination locks, and digital door locks, which require mainly numeric input.

Step 1: What you will need

You will need:

• Arduino uno
• Numpad – Keypad

Step 2: The Circuit

We are using 7 pins keypad with 3 columns and 4 rows.

Note:

If your system does not work properly you can change the connections in the next step and pin no in the commands Search the web for additional help or find the datasheet for your keypad.

Byte row Pins[ROWS] = {7, 2, 3, 5}; //connect to the row pinouts of the keypad

Byte column Pins[COLS] = {6, 8, 4}; //connect to the column pinouts of the keypad

Step 3: Code

Here's the code, embedded using codebender!

The keypad that we are using has 4 rows and 3 columns:

const byte rows = 4; //four rows

const byte cols = 3; //three columns

char keys[rows][cols] =

{ {'1','2','3'},

{'4','5','6'},

{'7','8','9'},

{'#','0','*'} };

Tip: If you have another set of keypad you can change those values with yours ;)

Step 4: Good Work

In this system we can learn about Arduino and how to use a keypad with arduino.