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// SIZER "0123456789012345678901234567890123456789"
char mess[16] = "I2C LCD "; // Hello style it's working message
char mess1[16] ="Button: "; // Part of the "a button is being pressed" message
char NUMB[4] = "000";
//*******************************************************************************************************************
// MAIN LOOP
//*******************************************************************************************************************
void loop()
{
for (i=0;i<8;i++)
{
LCDwr(mess[i]); // Print-out Hello style message to display one letter at a time
}
dispnumb(count); // Print-out counter value to display
count = count +1;
I2C_RX(MCP23017,GPIOB); // Check if Option buttons 1 to 5 are pressed
if (int(button)>0)
{
for (i=0;i<8;i++)
{
LCDwr(mess1[i]); // Print out button pressed message with number
}
dispnumb(int(button));
}
delay(2000); // Delay and do it again
LCDcmd(ClrLCD);
delay(200);
checkbutton();
}
//*******************************************************************************************************************
// SEND DECIMAL NUMBER TO DISPLAY
//*******************************************************************************************************************
void dispnumb(int numbvar)
{
//int THUS= abs(numbvar/1000);
int HUNDS= abs(numbvar/100);
int TENS = abs((numbvar - (HUNDS*100))/10);
int ONES = abs(numbvar-(HUNDS*100)-(TENS*10));
NUMB[0] = HUNDS+48; // +48 for ASCII conversion
NUMB[1] = TENS+48;
NUMB[2] = ONES+48;
for(i=0;i<3;i++)
{
LCDwr(NUMB[i]); // Print-Out 3 digit number at cursor
}
}
//*******************************************************************************************************************
// READ IF BUTTONS ARE BEING PRESSED
//*******************************************************************************************************************
void checkbutton() // Use serial monitor at 9600bps to see buttons that are pressed
{
I2C_RX(MCP23017,GPIOB);
buttonPress = int(button);
switch (buttonPress)
{
case 1:
Serial.println("Button-One");
break;
case 2:
Serial.println("Button-Two");
break;
case 4:
Serial.println("Button-Three");
break;
case 8:
Serial.println("Button-Four");
break;
case 16:
Serial.println("Button-Five");
break;
}
}
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