Accelerometer-based calculator with RPN (reverse Polish notation). Move the cursor by tilting your hand.

IMPORTANT: Because it uses RPN, to calculate 1+1 you need to first input "1", confirm, input an another "1" and then press "+". The same with the other operations.

Buttons:
- Lower :: click
- Middle :: push number to the stack (accept/confirm number)
- Middle hold :: empty the stack
- Upper :: backspace / pop a number from the stack
- Upper hold :: clear the current number

Fractions are supported up to two decimal places.