because: -it is available (both keypad and domesheet! 100 pieces) -it is affordable (<10$ for keypad and domesheet) -it has an easy contruction
Sure there are! Find me one that fulfills all three. But given that I have searched for two months, I highly doubt you will find one. Or design your own one!
Thanks for the compliment.. NOT! Anyway, it is all sold out!
Try to design and build your own, my files are online. I think you will very quickly run into a brick wall when you want to purchase your perfect keypad.