Buttons for arduino

Question

Arduino

There was a need to connect 10 buttons from 1 to 0 to Arudina with the possibility of receiving a response, pressed 1, displayed 1, 2 - 2 and the like, as in a regular calculator, for this you will need to buy simple buttons, add numbers from 1 to 0 on top and beyond program? Or are there ready-made solutions?

Answer 1

There are ready-made solutions. I immediately found it by "numeric keypad".

Answer 2

There is such an ' Arduino LCD Keypad Shield ' for Arduino, only lazy people don't make it.
A witty solution was applied there - the keyboard is served by only one input. analog.
A composite resistor is built from the keys, and the input measures its value. The solution is ingenious, though it allows you to press only one button at a time.
For the rest, either a scanned matrix or an expander with a bunch of GPIO pins.