Diagram of arduino uno software#

If it is pressed, then it will calculate the result and displays it on LCD. In the answer function, it will first check that if the ‘=’ button is pressed or not. In the operator function, it looks for which operator button is pressed and it will display that pressed operator on LCD. If it already has received the key, then it will look for the second number and will store it in the ‘second_number’ variable. While finding the key, it will store this in the ‘first_number’ variable and will print it on the LCD. In the getnumber function, it looks for the key which is pressed. Then the Arduino Unoo will execute the other functions and will calculate the result. Whenever a key will be pressed, then that pressed key information will be stored in the ‘button_pressed’ variable. Set the cursor point and then print ‘Arduino Based Calculator’ on the LCD. The resolution of the Nokia 5110 LCD is 84 X 48. In the setup function, first initialize a Nokia 5110 LCD and begin a communication between Arduino and Nokia 5110 LCD. This variable will help us in displaying the data on Nokia 5110 LCD. After that, we declared a variable for Nokia 5110 LCD named ‘Nokia_lcd’ of type PCD8544. The EEPROM library will store the information of pressed button. If (Button_pressed != NO_KEY & Button_pressed = 'C')įirst of all, we have added the libraries for keypad, EEPROM and Nokia 5110 LCD. Result = first_number.toInt() / second_number.toInt() Result = first_number.toInt() * second_number.toInt() Result = first_number.toInt() - second_number.toInt() Result = first_number.toInt() + second_number.toInt() If (final = true & Button_pressed != NO_KEY & Button_pressed = '=') If (presentValue = false & Button_pressed != NO_KEY & (Button_pressed = '/' || Button_pressed = '*' || Button_pressed = '-' || Button_pressed = '+')) Second_number = second_number + Button_pressed If (Button_pressed != NO_KEY & (Button_pressed='1'||Button_pressed='2'||Button_pressed='3'||Button_pressed='4'||Button_pressed='5'||Button_pressed='6'||Button_pressed='7'||Button_pressed='8'||Button_pressed='9'||Button_pressed='0'))įirst_number = first_number + Button_pressed Keypad myKeypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS )

Diagram of arduino uno software#

Software Arduino Uno Program #include īyte rowPins = //connect to the column pinouts of the keypad To make the connections of the 4X4 Keypad with the Arduino, connect the first six pins of 4X4 keypad with the A0 to A5 of Arduino Uno and connect the pin 7 and 8 of 4X4 keypad to the pin 9 and 8 of Arduino Uno respectively.

Connect the RST Pin of Nokia 5110 LCD to the pin 6 of Arduino Uno via 10KΩ resistor.

Connect the SCE Pin of Nokia 5110 LCD to the pin 7 of Arduino Uno via 1KΩ resistor.

Connect the D/C Pin of Nokia 5110 LCD to the pin 5 of Arduino Uno via 10KΩ resistor.

Connect the DIN Pin of Nokia 5110 LCD to the pin 4 of Arduino Uno via 10KΩ resistor.

Connect the CLK Pin of Nokia 5110 LCD to the pin 3 of Arduino Uno via 10KΩ resistor.

Connect the VCC Pin of Nokia 5110 LCD to the 3.3V pin of Arduino Uno.

Connect the LED Pin of Nokia 5110 LCD to the middle pin of 1k potentiometer through 330Ω resistor and connect the other two pins of the potentiometer to the VCC and GND.Connect the GND Pin of Nokia 5110 LCD to GND pin of Arduino Uno.

The connections of the Nokia 5110 LCD with the Arduino are as follows Hardware Circuit Diagram Calculator using Arduino Uno – Circuit Diagram Circuit Explanation This Arduino Uno based calculator can perform four operations which are addition, subtraction, multiplication and division. After calculating the result, it will print those calculated values on Nokia 5110 LCD. Arduino Uno has always helped to build projects easily and make them look more attractive. In this project, we are going to make an Arduino Uno calculator which will take the values from user by using the 4X4 keypad and then will perform the calculations to get the result.