calculator by dislis

Calculator

• Part List

• Arduino Duemilanove

• 4X3 matrix keypad

• LCD from DFROBOT

• A sip array resistors (or 4 resistors) is pull up resistors connected to row pins of keypad with the common terminal connected to +5V

Connections

• LCD DFROBOT

• LCD RS pin to digital pin 9

• LCD Enable pin to digital pin 8
• LCD D4 pin to digital pin 7
• LCD D5 pin to digital pin 6
• LCD D6 pin to digital pin 5
• LCD D7 pin to digital pin 4

• LCD R/W pin to ground

• 4x3 matrix key pad

• rows pin out of key pad to digital pins 3, 2, 1, 0

• colums pin out of key pad to digital pins 13, 12, 11

• sip array resistors

• 4 resistors as pull up resistors connected to rows pins (3,2,1,0)

Project ready

is a arduino calculator with Arduino Duemilanove , a LCD from DFrobot and A 4x3 keypad matrix the calculator precision is two decimal points the * key select the operation you want = ,+,-,*,/,decimal point,clear memory the # key is the enter key