calculator by dislis

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**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