Arduino - LCD Keypad Shield - Move character

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Source Code

	#include <LiquidCrystal.h>
	LiquidCrystal lcd(8, 9, 4, 5, 6, 7); // for lcd keypad shield
	#define btnRIGHT 0
	#define btnUP 1
	#define btnDOWN 2
	#define btnLEFT 3
	#define btnSELECT 4
	#define btnNONE 5
	byte heart[8] = {
	0b00000,
	0b01010,
	0b11111,
	0b11111,
	0b11111,
	0b01110,
	0b00100,
	0b00000
	};
	byte smiley[8] = {
	0b00000,
	0b00000,
	0b01010,
	0b00000,
	0b00000,
	0b10001,
	0b01110,
	0b00000
	};
	byte armsDown[8] = {
	0b00100,
	0b01010,
	0b00100,
	0b00100,
	0b01110,
	0b10101,
	0b00100,
	0b01010
	};
	byte armsUp[8] = {
	0b00100,
	0b01010,
	0b00100,
	0b10101,
	0b01110,
	0b00100,
	0b00100,
	0b01010
	};
	int x = 0;
	int y = 0;
	int pre_key = -1;
	// read the buttons
	int read_LCD_buttons() {
	int adc_key_in = analogRead(0); // read the value from the sensor
	if (adc_key_in > 1000) return btnNONE; // about 1023
	if (adc_key_in < 50) return btnRIGHT; // about 0
	if (adc_key_in < 195) return btnUP; // about 99
	if (adc_key_in < 380) return btnDOWN; // about 255
	if (adc_key_in < 555) return btnLEFT; // about 409
	if (adc_key_in < 790) return btnSELECT; // about 640
	return btnNONE; // when all others fail, return this...
	}
	void setup() {
	// initialize LCD and set up the number of columns and rows:
	lcd.begin(16, 2);
	lcd.createChar(0, heart);
	lcd.createChar(1, smiley);
	lcd.createChar(3, armsDown);
	lcd.createChar(4, armsUp);
	// set the cursor to the top left
	lcd.setCursor(0, 0);
	// Print a message to the lcd.
	lcd.print("I ");
	lcd.write(byte(0)); // when calling lcd.write() '0' must be cast as a byte
	lcd.print(" Arduino! ");
	lcd.write((byte)1);
	delay(2000);
	}
	void loop() {
	int lcd_key = read_LCD_buttons(); // read the buttons
	if (lcd_key != pre_key) {
	pre_key = lcd_key;
	switch (lcd_key) { // depending on which button was pushed, we perform an action
	case btnRIGHT:
	x++;
	break;
	case btnLEFT:
	x--;
	break;
	case btnUP:
	y--;
	break;
	case btnDOWN:
	y++;
	break;
	}
	if (x < 0) x = 0;
	if (x > 15) x = 15;
	if (y < 0) y = 0;
	if (y > 1) y = 1;
	}
	lcd.clear();
	lcd.setCursor(x, y);
	if ((millis() / 1000) % 2 == 0) {
	lcd.write(3);
	} else {
	lcd.write(4);
	}
	delay(100);
	}

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