ROBOTIC
TUTORIALS.COM

PRODUCTS	QUANTITY
Keypad	1
SPduino	1  Buy Now
Starter Shield	1  Buy Now
Connecting wires	8  Buy Now
USB Cable	1  Buy Now

SPduino:

Starter Shield:

Keypad:
A 4*4 matrix keypads consists of 4 rows and 4 columns

1. Interface Starter Shield and SPDuino board.
2. Connect the keypad pins to starter shield pins as mentioned in the diagram.
3. Connect the SPDuino board and laptop using USB cable and upload the program.

1. 0 to 9 : Numbers
2. A : Plus Operator (+)
3. B : Minus Operator (-)
4. C : Multiplication Operator (*)
5. D : Division Operator (/)
6. * : Clear (Clears the screen)
7. # : Equals (=)

This calculator is designed based on Shunting Yard Algorithm.
It is a method for parsing mathematical expressions specified in infix notation. It can be used to produce either a post fix notation string, also known as Reverse Polish notation (RPN), or an abstract syntax tree (AST). The algorithm was invented by Edsger Dijkstra and named the "Shunting yard" algorithm because its operation resembles that of a railroad shunting yard. Please read the attached PPT for the better understanding of the algorithm.