LOL Shield with keypad interface

Projects General Guidance
1

I am new to arduino and have ordered a LOL Shield. I was wondering if I can use a key pad to display two diget numbers on a lol shield.

2

Hi

All things are possible :slight_smile:

The LOL shield does use a lot of pins, but you still have your 6 analog ones available. So long as the keypad you choose can interface via pins that are still available you will be fine. Some matrix style keypads use only one analog pin and a resistor array to define the key depressed, so it is feasible.

Cheers! Geoff

3

Thank you I will have to make sure I buy the matrix keypad.

4

Bradywang:
Thank you I will have to make sure I buy the matrix keypad.

the important thing to look for is that the keypad uses pins that are left unused by the LOL. If you can do what you want by making your own with a few buttons, then search for examples of "resistor ladder" for how to get more switches read by an arduino without using up a pin for each.

5

Thanks for your help I did find this article http://www.instructables.com/id/Arduino-3-wire-Matrix-Keypad/?ALLSTEPS for a three pin keypad interface.