In this project you can see how to make keypad .
you need :
.In this project you can see how to make keypad and to control with arduino (to make password, control servo with password etc) using simple button
3. some wire Its simple project juct you need to connect button. to see how to connect button see the photo . 1.connect pin 1 of button 1 to pin1 of buton 3 . (one pin on keypad). 2.connect pin 1 of button 2 to pin 1 of button 4. (two pin on keypad). 3.connect pin 2 of button 1 to pin 1 of button 3. (three pin on keypad).
4.connect pin 2 of button 2 to pin 2 of button 4. (two pin on keypad).
for all project go to http://best-circuit.blogspot.com/