help with code in triggering a relay using a numpad

hi good day
I am a college student and is looking to get some assistance in building a code to my project I need to trigger a relay using a numpad. Hope you can help me with this thanks in advance :slight_smile:

What hardware do you have?
What have you done?

actually i haven't started anything yet iam new in using arduino uno. one of my professor advise me to ask question here:)

i wanted to know what kind of numpad is compatible to adruino uno and how to program it so i can trigger a relay to work so the relay can start the transmitter to send signals

Try the keypad.h library.
http://playground.arduino.cc/Code/Keypad