#include <LiquidCrystal.h>
LiquidCrystal lcd(8,9,4,5,6,7);
int keypad_pin = A0;
int keypad_value = 0;
int keypad_value_old = 0;
char btn_push;
byte mainMenuPage = 1;
byte mainMenuPageOld = 1;
byte mainMenuTotal = 4;
void setup()
{
lcd.begin(16,2); //Initialize a 2x16 type LCD
MainMenuDisplay();
delay(1000);
}
void loop()
{
btn_push = ReadKeypad();
MainMenuBtn();
if(btn_push == 'S')//enter selected menu
{
WaitBtnRelease();
switch (mainMenuPage)
{
case 1:
MenuA();
break;
case 2:
MenuB();
break;
case 3:
MenuC();
break;
case 4:
MenuD();
break;
}
MainMenuDisplay();
WaitBtnRelease();
}
delay(10);
}//--------------- End of loop() loop ---------------------
void MenuA()
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("hello");
while(ReadKeypad()!= 'L')
{
digitalWrite(11, HIGH);
delay(100);//Insert Task for Menu A here
}
}
void MenuB()
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Inside Menu B");
while(ReadKeypad()!= 'L')
{
//Insert Task for Menu A here
}
}
void MenuC()
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Inside Menu C");
while(ReadKeypad()!= 'L')
{
//Insert Task for Menu A here
}
}
void MenuD()
{
lcd.clear();
lcd.setCursor(0,0);
lcd.print("Inside Menu D");
while(ReadKeypad()!= 'L')
{
//Insert Task for Menu A here
}
}
void MainMenuDisplay()
{
lcd.clear();
lcd.setCursor(0,0);
switch (mainMenuPage)
{
case 1:
lcd.print("1. Menu A");
break;
case 2:
lcd.print("2. Menu B");
break;
case 3:
lcd.print("3. Menu C");
break;
case 4:
lcd.print("4. Menu D");
break;
}
}
void MainMenuBtn()
{
WaitBtnRelease();
if(btn_push == 'U')
{
mainMenuPage++;
if(mainMenuPage > mainMenuTotal)
mainMenuPage = 1;
}
else if(btn_push == 'D')
{
mainMenuPage--;
if(mainMenuPage == 0)
mainMenuPage = mainMenuTotal;
}
if(mainMenuPage != mainMenuPageOld) //only update display when page change
{
MainMenuDisplay();
mainMenuPageOld = mainMenuPage;
}
}
char ReadKeypad()
{
/* Keypad button analog Value
no button pressed 1023
select 741
left 503
down 326
up 142
right 0
*/
keypad_value = analogRead(keypad_pin);
if(keypad_value < 100)
return 'R';
else if(keypad_value < 200)
return 'U';
else if(keypad_value < 400)
return 'D';
else if(keypad_value < 600)
return 'L';
else if(keypad_value < 800)
return 'S';
else
return 'N';
}
void WaitBtnRelease()
{
while( analogRead(keypad_pin) < 800){}
}
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