Hey there!
My last project on an arduino was a calculator which was controlled by a keypad,and i was only able to do this using a code i found online and modified it a bit just to suit my hardware, and in an effort to enhance my arduino skills, i'm trying to make a calculator that can be controlled by the keypad and an IR remote simultaneously.But I seriously don't know where to begin.
I know I should use switch() and all,but how do i get two numbers to become one piece of data(5 and 9 become 59), and how do i perform actions on them?
Please DO NOT post/share the full code for achieving this,I only want guidelines.
Any help would be appreciated
This is my code so far(I only added the definitions and the receiver part(end of the code) onto the previous keypad -only calculator).
/*
|| @version 1.0
|| @author Andrew Mascolo
|| @date May 15, 2013
||
|| @description
|| Simple use of keypad and LCD
*/
#include <Keypad.h>
#include <Wire.h>
#include <LiquidCrystal_I2C.h>
#include <IRRemote.h>
#define FF6897 0
#define FF30CF 1
#define FF18E7 2
#define FF7A85 3
#define FF10EF 4
#define FF38C7 5
#define FF5AA5 6
#define FF42BD 7
#define FF4AB5 8
#define FF52AD 9
int RECV_PIN = 11;
IRrecv irrecv(RECV_PIN);
decode_results results;
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE);
long first = 0;
long second = 0;
double total = 0;
char customKey;
const byte ROWS = 4;
const byte COLS = 4;
char keys[ROWS][COLS] = {
{'1','2','3','+'},
{'4','5','6','-'},
{'7','8','9','*'},
{'C','0','=','/'}
};
byte rowPins[ROWS] = {9, 8, 7, 6}; //connect to the row pinouts of the keypad
byte colPins[COLS] = {5, 4, 3, 2}; //connect to the column pinouts of the keypad
//initialize an instance of class NewKeypad
Keypad customKeypad = Keypad( makeKeymap(keys), rowPins, colPins, ROWS, COLS);
void setup()
{
lcd.begin(16,2); // initialize the lcd
lcd.backlight();
Serial.begin(9600);
irrecv.enableIRIn();
}
void loop()
{
customKey = customKeypad.getKey();
switch(customKey)
{
case '0' ... '9': // This keeps collecting the first value until a operator is pressed "+-*/"
lcd.setCursor(0,0);
first = first * 10 + (customKey - '0');
lcd.print(first);
break;
case '+':
first = (total != 0 ? total : first);
lcd.setCursor(0,1);
lcd.print("+");
second = SecondNumber(); // get the collected the second number
total = first + second;
lcd.setCursor(0,3);
lcd.print(total);
first = 0, second = 0; // reset values back to zero for next use
break;
case '-':
first = (total != 0 ? total : first);
lcd.setCursor(0,1);
lcd.print("-");
second = SecondNumber();
total = first - second;
lcd.setCursor(0,3);
lcd.print(total);
first = 0, second = 0;
break;
case '*':
first = (total != 0 ? total : first);
lcd.setCursor(0,1);
lcd.print("*");
second = SecondNumber();
total = first * second;
lcd.setCursor(0,3);
lcd.print(total);
first = 0, second = 0;
break;
case '/':
first = (total != 0 ? total : first);
lcd.setCursor(0,1);
lcd.print("/");
second = SecondNumber();
lcd.setCursor(0,3);
second == 0 ? lcd.print("Invalid") : total = (float)first / (float)second;
lcd.print(total);
first = 0, second = 0;
break;
case 'C':
total = 0;
lcd.clear();
break;
}
}
long SecondNumber()
{
while( 1 )
{
customKey = customKeypad.getKey();
if(customKey >= '0' && customKey <= '9')
{
second = second * 10 + (customKey - '0');
lcd.setCursor(0,2);
lcd.print(second);
}
if(customKey == '=') break; //return second;
}
return second;
if (irrecv.decode(&results)) {
Serial.println(results.value, HEX);
irrecv.resume(); // Receive the next value
}
delay(100);
}
Note that I changed the library name from 'IRremote' to 'IRRemote' because a library with that name already exists.
Happy New Year 