// This example shows various featues of the library for LCD with 16 chars and 2 lines.

#include <Arduino.h>

#include <Wire.h>

#include <LiquidCrystal_PCF8574.h>

LiquidCrystal_PCF8574 lcd(0x27);  // set the LCD address to 0x27 for a 16 chars and 2 line display

int show = -1;

// 2 custom characters

byte dotOff[] = { 0b00000, 0b01110, 0b10001, 0b10001,

                  0b10001, 0b01110, 0b00000, 0b00000 };

byte dotOn[] = { 0b00000, 0b01110, 0b11111, 0b11111,

                 0b11111, 0b01110, 0b00000, 0b00000 };

void setup() {

  int error;

  Serial.begin(115200);

  Serial.println("LCD...");

  // wait on Serial to be available on Leonardo

  while (!Serial)

    ;

  Serial.println("Probing for PCF8574 on address 0x27...");

  // See http://playground.arduino.cc/Main/I2cScanner how to test for a I2C device.

  Wire.begin();

  Wire.beginTransmission(0x27);

  error = Wire.endTransmission();

  Serial.print("Error: ");

  Serial.print(error);

  if (error == 0) {

    Serial.println(": LCD found.");

    show = 0;

    lcd.begin(16, 2);  // initialize the lcd

    lcd.createChar(1, dotOff);

    lcd.createChar(2, dotOn);

  } else {

    Serial.println(": LCD not found.");

  }  // if

}  // setup()

void loop() {

  if (show == 0) {

    lcd.setBacklight(255);

    lcd.home();

    lcd.clear();

    lcd.print("Hello LCD");

    delay(1000);

    lcd.setBacklight(0);

    delay(400);

    lcd.setBacklight(255);

  } else if (show == 1) {

    lcd.clear();

    lcd.print("Cursor On");

    lcd.cursor();

  } else if (show == 2) {

    lcd.clear();

    lcd.print("Cursor Blink");

    lcd.blink();

  } else if (show == 3) {

    lcd.clear();

    lcd.print("Cursor OFF");

    lcd.noBlink();

    lcd.noCursor();

  } else if (show == 4) {

    lcd.clear();

    lcd.print("Display Off");

    lcd.noDisplay();

  } else if (show == 5) {

    lcd.clear();

    lcd.print("Display On");

    lcd.display();

  } else if (show == 7) {

    lcd.clear();

    lcd.setCursor(0, 0);

    lcd.print("*** first line.");

    lcd.setCursor(0, 1);

    lcd.print("*** second line.");

  } else if (show == 8) {

    lcd.scrollDisplayLeft();

  } else if (show == 9) {

    lcd.scrollDisplayLeft();

  } else if (show == 10) {

    lcd.scrollDisplayLeft();

  } else if (show == 11) {

    lcd.scrollDisplayRight();

  } else if (show == 12) {

    lcd.clear();

    lcd.print("write-");

  } else if (show == 13) {

    lcd.clear();

    lcd.print("custom 1:<\01>");

    lcd.setCursor(0, 1);

    lcd.print("custom 2:<\02>");

  } else {

    lcd.print(show - 13);

  }  // if

  delay(1400);

  show = (show + 1) % 16;

}  // loop()