Using a 4x4 Matrix Keypad

Hey there! I've been Googling on how to use a 4x4 matrix keypad, but I can't find anything! Only for those with digits.

I have this one: |423x500

Any code examples and how to connect it to the arduino?



The matrix keypad provides no information to the Arduino on what each key should be, so what you've found for the numeric ones online is exactly what you need. There's an Arduino tutorial here for them and you'll see what is returned by each key is defined in the code in the keys[] array. You could just as easy call those a,b,c,d etc if you weren't looking for numbers, or indeed far more complex meanings can be coded to each one rather than a single character.

Cheers! Geoff