// ==================================================== // ArduExams Copyright(C) 2018 Furkan Türkal // This program comes with ABSOLUTELY NO WARRANTY; This is free software, // and you are welcome to redistribute it under certain conditions; See // file LICENSE, which is part of this source code package, for details. // ==================================================== #include <LiquidCrystal.h> #define BTN_LCD_RIGHT 0 #define BTN_LCD_UP 1 #define BTN_LCD_DOWN 2 #define BTN_LCD_LEFT 3 #define BTN_LCD_SELECT 4 #define BTN_LCD_NONE 5 LiquidCrystal lcd(0, 1, 4, 5, 6, 7); int LCD_KeyValue = 0; int LCD_KeyIn = 0; int LCD_CurrentX = 0; int LCD_CurrentY = 0; void setup() { lcd.begin(16, 2); lcd.clear(); lcd.setCursor(1,1); lcd.print("A"); Serial.begin(9600); } void loop() { LCD_CurrentX = constrain(LCD_CurrentX, 0, 16); LCD_CurrentY = constrain(LCD_CurrentY, 0, 2); lcd.clear(); lcd.setCursor(LCD_CurrentX, LCD_CurrentY); lcd.print("A"); LCD_KeyValue = readLCDButtons(); switch(LCD_KeyValue){ case BTN_LCD_UP: LCD_CurrentY++; break; case BTN_LCD_DOWN: LCD_CurrentY--; break; case BTN_LCD_LEFT: LCD_CurrentX--; break; case BTN_LCD_RIGHT: LCD_CurrentX++; break; } delay(10); } int readLCDButtons(){ LCD_KeyIn = analogRead(0); if (LCD_KeyIn > 1000) return BTN_LCD_NONE; if (LCD_KeyIn < 50) return BTN_LCD_RIGHT; if (LCD_KeyIn < 195) return BTN_LCD_UP; if (LCD_KeyIn < 380) return BTN_LCD_DOWN; if (LCD_KeyIn < 555) return BTN_LCD_LEFT; if (LCD_KeyIn < 790) return BTN_LCD_SELECT; return BTN_LCD_NONE; }