Included LCD Library

2024-06-23 15:15:26 +02:00
parent 1d123f3ff2
commit 6d210c0885
5 changed files with 758 additions and 7 deletions
--- a/lib/LiquidCrystal_I2C/LiquidCrystal_I2C.cpp
+++ b/lib/LiquidCrystal_I2C/LiquidCrystal_I2C.cpp
@@ -0,0 +1,295 @@
+// Based on the work by DFRobot upgraded by DVSProductions
+#include "LiquidCrystal_I2C.h"
+#include <inttypes.h>
+/*********** mid level commands, for sending data/cmds */
+#define COMMAND(value) send(value, 0)
+#define printIIC(args) i2c->write(_Addr, args, 1)
+size_t LiquidCrystal_I2C::write(uint8_t value) {
+    send(value, Rs);
+    return 1;
+}
+
+inline void LiquidCrystal_I2C::command(uint8_t value) {
+    send(value, 0);
+}
+
+// When the display powers up, it is configured as follows:
+//
+// 1. Display clear
+// 2. Function set:
+//    DL = 1; 8-bit interface data
+//    N = 0; 1-line display
+//    F = 0; 5x8 dot character font
+// 3. Display on/off control:
+//    D = 0; Display off
+//    C = 0; Cursor off
+//    B = 0; Blinking off
+// 4. Entry mode set:
+//    I/D = 1; Increment by 1
+//    S = 0; No shift
+//
+// Note, however, that resetting the Arduino doesn't reset the LCD, so we
+// can't assume that its in that state when a sketch starts (and the
+// LiquidCrystal constructor is called).
+
+/*!
+Creates a new LCD instance
+!*/
+LiquidCrystal_I2C::LiquidCrystal_I2C(uint8_t lcd_Addr, uint8_t lcd_cols, uint8_t lcd_rows, PinName sda, PinName scl) {
+    _Addr = lcd_Addr << 1;
+    _cols = lcd_cols;
+    _rows = lcd_rows;
+    _backlightval = LCD_NOBACKLIGHT;
+    i2c = new I2C(sda, scl);
+    i2c->frequency(1000000);
+}
+
+ void LiquidCrystal_I2C::init() {
+    init_priv();
+}
+
+ void LiquidCrystal_I2C::init_priv() {
+    _displayfunction = LCD_4BITMODE | LCD_1LINE | LCD_5x8DOTS;
+    begin_priv();
+}
+void LiquidCrystal_I2C::begin_priv(uint8_t dotsize) {
+    if (_rows > 1) {
+        _displayfunction |= LCD_2LINE;
+    }
+    _numlines = _rows;
+    // for some 1 line displays you can select a 10 pixel high font
+    if ((dotsize != 0) && (_rows == 1)) {
+        _displayfunction |= LCD_5x10DOTS;
+    }
+    // SEE PAGE 45/46 FOR INITIALIZATION SPECIFICATION!
+    // according to datasheet, we need at least 40ms after power rises above 2.7V
+    // before sending commands. Nucleo can turn on way befer 4.5V so we'll wait
+    // 50
+    wait_ms(50);
+    // Now we pull both RS and R/W low to begin commands
+    expanderWrite(_backlightval); // reset expanderand turn backlight off (Bit 8 =1)
+    wait_ms(1000);
+    // put the LCD into 4 bit mode
+    // this is according to the hitachi HD44780 datasheet
+    // figure 24, pg 46
+
+    // we start in 8bit mode, try to set 4 bit mode
+    write4bits(0x03 << 4);
+    wait_us(4100); // wait min 4.1ms
+    // second try
+    write4bits(0x03 << 4);
+    wait_us(4100); // wait min 4.1ms
+    // third go!
+    write4bits(0x03 << 4);
+    wait_us(150);
+    // finally, set to 4-bit interface
+    write4bits(0x02 << 4);
+    // set # lines, font size, etc.
+    COMMAND(LCD_FUNCTIONSET | _displayfunction);
+    // turn the display on with no cursor or blinking default
+    _displaycontrol = LCD_DISPLAYON | LCD_CURSOROFF | LCD_BLINKOFF;
+    display();
+    // clear it off
+    clear();
+    // Initialize to default text direction (for roman languages)
+    _displaymode = LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT;
+    // set the entry mode
+    COMMAND(LCD_ENTRYMODESET | LCD_ENTRYLEFT | LCD_ENTRYSHIFTDECREMENT);
+    home();
+}
+void LiquidCrystal_I2C::begin(uint8_t cols, uint8_t lines, uint8_t dotsize) {
+    _cols = cols;
+    _rows = lines;
+    begin_priv();
+}
+
+/********** high level commands, for the user! */
+void LiquidCrystal_I2C::clear() {
+    COMMAND(LCD_CLEARDISPLAY); // clear display, set cursor position to zero
+    wait_us(2000);             // this command takes a long time!
+}
+
+void LiquidCrystal_I2C::home() {
+    COMMAND(LCD_RETURNHOME); // set cursor position to zero
+    wait_us(2000);           // this command takes a long time!
+}
+
+void LiquidCrystal_I2C::setCursor(uint8_t col, uint8_t row) {
+    int row_offsets[] = { 0x00, 0x40, 0x14, 0x54 };
+    if (row > _numlines)
+        row = _numlines - 1; // we count rows starting w/0
+    COMMAND(LCD_SETDDRAMADDR | (col + row_offsets[row]));
+}
+
+// Turn the display on/off (quickly)
+void LiquidCrystal_I2C::noDisplay() {
+    _displaycontrol &= ~LCD_DISPLAYON;
+    COMMAND(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal_I2C::display() {
+    _displaycontrol |= LCD_DISPLAYON;
+    COMMAND(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turns the underline cursor on/off
+void LiquidCrystal_I2C::noCursor() {
+    _displaycontrol &= ~LCD_CURSORON;
+    COMMAND(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal_I2C::cursor() {
+    _displaycontrol |= LCD_CURSORON;
+    COMMAND(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// Turn on and off the blinking cursor
+void LiquidCrystal_I2C::noBlink() {
+    _displaycontrol &= ~LCD_BLINKON;
+    COMMAND(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+void LiquidCrystal_I2C::blink() {
+    _displaycontrol |= LCD_BLINKON;
+    COMMAND(LCD_DISPLAYCONTROL | _displaycontrol);
+}
+
+// These commands scroll the display without changing the RAM
+void LiquidCrystal_I2C::scrollDisplayLeft(void) {
+    COMMAND(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVELEFT);
+}
+void LiquidCrystal_I2C::scrollDisplayRight(void) {
+    COMMAND(LCD_CURSORSHIFT | LCD_DISPLAYMOVE | LCD_MOVERIGHT);
+}
+
+// This is for text that flows Left to Right
+void LiquidCrystal_I2C::leftToRight(void) {
+    _displaymode |= LCD_ENTRYLEFT;
+    COMMAND(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This is for text that flows Right to Left
+void LiquidCrystal_I2C::rightToLeft(void) {
+    _displaymode &= ~LCD_ENTRYLEFT;
+    COMMAND(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'right justify' text from the cursor
+void LiquidCrystal_I2C::autoscroll(void) {
+    _displaymode |= LCD_ENTRYSHIFTINCREMENT;
+    COMMAND(LCD_ENTRYMODESET | _displaymode);
+}
+
+// This will 'left justify' text from the cursor
+void LiquidCrystal_I2C::noAutoscroll(void) {
+    _displaymode &= ~LCD_ENTRYSHIFTINCREMENT;
+    COMMAND(LCD_ENTRYMODESET | _displaymode);
+}
+
+// Allows us to fill the first 8 CGRAM locations
+// with custom characters
+void LiquidCrystal_I2C::createChar(uint8_t location, uint8_t charmap[]) {
+    location &= 0x7; // we only have 8 locations 0-7
+    COMMAND(LCD_SETCGRAMADDR | (location << 3));
+    for (uint8_t i = 0; i != 8; i++)
+        write(charmap[i]);
+}
+
+// Turn the (optional) backlight off/on
+void LiquidCrystal_I2C::noBacklight(void) {
+    _backlightval = LCD_NOBACKLIGHT;
+    expanderWrite(0);
+}
+
+void LiquidCrystal_I2C::backlight(void) {
+    _backlightval = LCD_BACKLIGHT;
+    expanderWrite(0);
+}
+
+/************ low level data pushing commands **********/
+
+// write either command or data
+void LiquidCrystal_I2C::send(uint8_t value, uint8_t mode) {
+    uint8_t highnib = value & 0xf0;
+    uint8_t lownib = (value << 4) & 0xf0;
+    write4bits((highnib) | mode);
+    write4bits((lownib) | mode);
+}
+
+void LiquidCrystal_I2C::write4bits(uint8_t value) {
+    expanderWrite(value);
+    pulseEnable(value);
+}
+char buff;
+inline void LiquidCrystal_I2C::expanderWrite(uint8_t _data) {
+    buff = (_data) | _backlightval;
+    printIIC(&buff);
+}
+
+void LiquidCrystal_I2C::pulseEnable(uint8_t _data) {
+    expanderWrite(_data | En); // En high
+    wait_us(1);                // enable pulse must be >450ns
+
+    expanderWrite(_data & ~En); // En low
+    wait_us(10);                // commands need > 37us to settle
+}
+
+// Alias functions
+
+inline void LiquidCrystal_I2C::cursor_on() {
+    cursor();
+}
+
+inline void LiquidCrystal_I2C::cursor_off() {
+    noCursor();
+}
+
+inline void LiquidCrystal_I2C::blink_on() {
+    blink();
+}
+
+inline void LiquidCrystal_I2C::blink_off() {
+    noBlink();
+}
+
+inline void LiquidCrystal_I2C::load_custom_character(uint8_t char_num, uint8_t *rows) {
+    createChar(char_num, rows);
+}
+
+void LiquidCrystal_I2C::setBacklight(uint8_t new_val) {
+    if (new_val)
+        backlight(); // turn backlight on
+    else
+        noBacklight(); // turn backlight off
+}
+
+void LiquidCrystal_I2C::printstr(const char c[]) {
+    // This function is not identical to the function used for "real" I2C displays
+    // it's here so the use sketch doesn't have to be changed
+    print(c);
+}
+
+// unsupported API functions
+void LiquidCrystal_I2C::off() {
+    noBacklight();
+}
+void LiquidCrystal_I2C::on() {
+    begin_priv();
+    backlight();
+}
+void LiquidCrystal_I2C::setDelay(int cmdDelay, int charDelay) {}
+uint8_t LiquidCrystal_I2C::status() {
+    return 0;
+}
+uint8_t LiquidCrystal_I2C::keypad() {
+    return 0;
+}
+uint8_t LiquidCrystal_I2C::init_bargraph(uint8_t graphtype) {
+    return 0;
+}
+void LiquidCrystal_I2C::draw_horizontal_graph(uint8_t row, uint8_t column,
+    uint8_t len,
+    uint8_t pixel_col_end) {
+}
+void LiquidCrystal_I2C::draw_vertical_graph(uint8_t row, uint8_t column,
+    uint8_t len,
+    uint8_t pixel_row_end) {
+}
+void LiquidCrystal_I2C::setContrast(uint8_t new_val) {}
--- a/lib/LiquidCrystal_I2C/LiquidCrystal_I2C.h
+++ b/lib/LiquidCrystal_I2C/LiquidCrystal_I2C.h
@@ -0,0 +1,127 @@
+// YWROBOT
+#ifndef LiquidCrystal_I2C_h
+#define LiquidCrystal_I2C_h
+#include "Print.h"
+#include "mbed.h"
+#include <inttypes.h>
+
+// commands
+#define LCD_CLEARDISPLAY 0x01
+#define LCD_RETURNHOME 0x02
+#define LCD_ENTRYMODESET 0x04
+#define LCD_DISPLAYCONTROL 0x08
+#define LCD_CURSORSHIFT 0x10
+#define LCD_FUNCTIONSET 0x20
+#define LCD_SETCGRAMADDR 0x40
+#define LCD_SETDDRAMADDR 0x80
+
+// flags for display entry mode
+#define LCD_ENTRYRIGHT 0x00
+#define LCD_ENTRYLEFT 0x02
+#define LCD_ENTRYSHIFTINCREMENT 0x01
+#define LCD_ENTRYSHIFTDECREMENT 0x00
+
+// flags for display on/off control
+#define LCD_DISPLAYON 0x04
+#define LCD_DISPLAYOFF 0x00
+#define LCD_CURSORON 0x02
+#define LCD_CURSOROFF 0x00
+#define LCD_BLINKON 0x01
+#define LCD_BLINKOFF 0x00
+
+// flags for display/cursor shift
+#define LCD_DISPLAYMOVE 0x08
+#define LCD_CURSORMOVE 0x00
+#define LCD_MOVERIGHT 0x04
+#define LCD_MOVELEFT 0x00
+
+// flags for function set
+#define LCD_8BITMODE 0x10
+#define LCD_4BITMODE 0x00
+#define LCD_2LINE 0x08
+#define LCD_1LINE 0x00
+#define LCD_5x10DOTS 0x04
+#define LCD_5x8DOTS 0x00
+
+// flags for backlight control
+#define LCD_BACKLIGHT 0x08
+#define LCD_NOBACKLIGHT 0x00
+
+#define En 0B00000100 // Enable bit
+#define Rw 0B00000010 // Read/Write bit
+#define Rs 0B00000001 // Register select bit
+
+class LiquidCrystal_I2C : public Print {
+public:
+  LiquidCrystal_I2C(uint8_t lcd_Addr, uint8_t lcd_cols, uint8_t lcd_rows,
+                    PinName sda, PinName scl);
+  void begin(uint8_t cols, uint8_t rows, uint8_t charsize = LCD_5x8DOTS);
+  void clear();
+  void home();
+  void noDisplay();
+  void display();
+  void noBlink();
+  void blink();
+  void noCursor();
+  void cursor();
+  void scrollDisplayLeft();
+  void scrollDisplayRight();
+  void printLeft();
+  void printRight();
+  void leftToRight();
+  void rightToLeft();
+  void shiftIncrement();
+  void shiftDecrement();
+  void noBacklight();
+  void backlight();
+  void autoscroll();
+  void noAutoscroll();
+  void createChar(uint8_t, uint8_t[]);
+  void setCursor(uint8_t, uint8_t);
+
+  virtual size_t write(uint8_t);
+  void command(uint8_t);
+  void init();
+
+  ////compatibility API function aliases
+  void blink_on();                    // alias for blink()
+  void blink_off();                   // alias for noBlink()
+  void cursor_on();                   // alias for cursor()
+  void cursor_off();                  // alias for noCursor()
+  void setBacklight(uint8_t new_val); // alias for backlight() and nobacklight()
+  void load_custom_character(uint8_t char_num,
+                             uint8_t *rows); // alias for createChar()
+  void printstr(const char[]);
+
+  ////Unsupported API functions (not implemented in this library)
+  uint8_t status();
+  void setContrast(uint8_t new_val);
+  uint8_t keypad();
+  void setDelay(int, int);
+  void on();
+  void off();
+  uint8_t init_bargraph(uint8_t graphtype);
+  void draw_horizontal_graph(uint8_t row, uint8_t column, uint8_t len,
+                             uint8_t pixel_col_end);
+  void draw_vertical_graph(uint8_t row, uint8_t column, uint8_t len,
+                           uint8_t pixel_col_end);
+
+private:
+  mbed::I2C *i2c;
+  void init_priv();
+  void begin_priv(uint8_t charsize = LCD_5x8DOTS);
+  void send(uint8_t, uint8_t);
+  void write4bits(uint8_t);
+  void expanderWrite(uint8_t);
+  void pulseEnable(uint8_t);
+  uint8_t _Addr;
+  uint8_t _displayfunction;
+  uint8_t _displaycontrol;
+  uint8_t _displaymode;
+  uint8_t _numlines;
+  uint8_t _cols;
+  uint8_t _rows;
+  uint8_t _backlightval;
+};
+
+#endif
--- a/lib/Print/Print.cpp
+++ b/lib/Print/Print.cpp
@@ -0,0 +1,230 @@
+/*
+ Print.cpp - Base class that provides print() and println()
+ Copyright (c) 2008 David A. Mellis.  All right reserved.
+ 
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ 
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+ 
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ 
+ Modified 23 November 2006 by David A. Mellis
+ Modified 03 August 2015 by Chuck Todd
+ */
+
+#include <string>
+#include <cmath>
+
+#include "Print.h"
+
+// Public Methods //////////////////////////////////////////////////////////////
+
+/* default implementation: may be overridden */
+size_t Print::write(const uint8_t *buffer, size_t size)
+{
+  size_t n = 0;
+  while (size--) {
+    if (write(*buffer++)) n++;
+    else break;
+  }
+  return n;
+}
+
+size_t Print::print(const std::string &s)
+{
+  return write(s.c_str(), s.length());
+}
+
+size_t Print::print(const char str[])
+{
+  return write(str);
+}
+
+size_t Print::print(char c)
+{
+  return write(c);
+}
+
+size_t Print::print(unsigned char b, int base)
+{
+  return print((unsigned long) b, base);
+}
+
+size_t Print::print(int n, int base)
+{
+  return print((long) n, base);
+}
+
+size_t Print::print(unsigned int n, int base)
+{
+  return print((unsigned long) n, base);
+}
+
+size_t Print::print(long n, int base)
+{
+  if (base == 0) {
+    return write(n);
+  } else if (base == 10) {
+    if (n < 0) {
+      int t = print('-');
+      n = -n;
+      return printNumber(n, 10) + t;
+    }
+    return printNumber(n, 10);
+  } else {
+    return printNumber(n, base);
+  }
+}
+
+size_t Print::print(unsigned long n, int base)
+{
+  if (base == 0) return write(n);
+  else return printNumber(n, base);
+}
+
+size_t Print::print(double n, int digits)
+{
+  return printFloat(n, digits);
+}
+size_t Print::println(void)
+{
+  return write("\r\n");
+}
+
+size_t Print::println(const std::string &s)
+{
+  size_t n = print(s);
+  n += println();
+  return n;
+}
+
+size_t Print::println(const char c[])
+{
+  size_t n = print(c);
+  n += println();
+  return n;
+}
+
+size_t Print::println(char c)
+{
+  size_t n = print(c);
+  n += println();
+  return n;
+}
+
+size_t Print::println(unsigned char b, int base)
+{
+  size_t n = print(b, base);
+  n += println();
+  return n;
+}
+
+size_t Print::println(int num, int base)
+{
+  size_t n = print(num, base);
+  n += println();
+  return n;
+}
+
+size_t Print::println(unsigned int num, int base)
+{
+  size_t n = print(num, base);
+  n += println();
+  return n;
+}
+
+size_t Print::println(long num, int base)
+{
+  size_t n = print(num, base);
+  n += println();
+  return n;
+}
+
+size_t Print::println(unsigned long num, int base)
+{
+  size_t n = print(num, base);
+  n += println();
+  return n;
+}
+
+size_t Print::println(double num, int digits)
+{
+  size_t n = print(num, digits);
+  n += println();
+  return n;
+}
+
+// Private Methods /////////////////////////////////////////////////////////////
+
+size_t Print::printNumber(unsigned long n, uint8_t base)
+{
+  char buf[8 * sizeof(long) + 1]; // Assumes 8-bit chars plus zero byte.
+  char *str = &buf[sizeof(buf) - 1];
+
+  *str = '\0';
+
+  // prevent crash if called with base == 1
+  if (base < 2) base = 10;
+
+  do {
+    char c = n % base;
+    n /= base;
+
+    *--str = c < 10 ? c + '0' : c + 'A' - 10;
+  } while(n);
+
+  return write(str);
+}
+
+size_t Print::printFloat(double number, uint8_t digits) 
+{ 
+  size_t n = 0;
+  
+  if (isnan(number)) return print("nan");
+  if (isinf(number)) return print("inf");
+  if (number > 4294967040.0) return print ("ovf");  // constant determined empirically
+  if (number <-4294967040.0) return print ("ovf");  // constant determined empirically
+  
+  // Handle negative numbers
+  if (number < 0.0)
+  {
+     n += print('-');
+     number = -number;
+  }
+
+  // Round correctly so that print(1.999, 2) prints as "2.00"
+  double rounding = 0.5;
+  for (uint8_t i=0; i<digits; ++i)
+    rounding /= 10.0;
+  
+  number += rounding;
+
+  // Extract the integer part of the number and print it
+  unsigned long int_part = (unsigned long)number;
+  double remainder = number - (double)int_part;
+  n += print(int_part);
+
+  // Print the decimal point, but only if there are digits beyond
+  if (digits > 0) {
+    n += print('.'); 
+  }
+
+  // Extract digits from the remainder one at a time
+  while (digits-- > 0)
+  {
+    remainder *= 10.0;
+    unsigned int toPrint = (unsigned int)(remainder);
+    n += print(toPrint);
+    remainder -= toPrint; 
+  } 
+  
+  return n;
+}
--- a/lib/Print/Print.h
+++ b/lib/Print/Print.h
@@ -0,0 +1,96 @@
+/*
+ Print.h - Base class that provides print() and println()
+ Copyright (c) 2008 David A. Mellis.  All right reserved.
+ This library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Lesser General Public
+ License as published by the Free Software Foundation; either
+ version 2.1 of the License, or (at your option) any later version.
+ This library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ Lesser General Public License for more details.
+ You should have received a copy of the GNU Lesser General Public
+ License along with this library; if not, write to the Free Software
+ Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+#ifndef Print_h
+#define Print_h
+
+#include <stdint.h>
+#include <string>
+#include <string.h>
+
+#define DEC 10
+#define HEX 16
+#define OCT 8
+#define BIN 2
+
+class Print {
+    private:
+        int write_error;
+        size_t printNumber(unsigned long, uint8_t);
+        size_t printFloat(double, uint8_t);
+    protected:
+        inline void setWriteError(int err = 1) {
+            write_error = err;
+        }
+    public:
+        Print() :
+                write_error(0) {
+        }
+
+        int getWriteError() {
+            return write_error;
+        }
+        void clearWriteError() {
+            setWriteError(0);
+        }
+
+        virtual size_t write(uint8_t) = 0;
+        size_t write(const char *str) {
+            if(str == NULL)
+                return 0;
+        return write((const uint8_t *) str, strlen(str));
+        }
+        virtual size_t write(const uint8_t *buffer, size_t size);
+        size_t write(const char *buffer, size_t size) {
+            return write((const uint8_t *) buffer, size);
+        }
+        // These handle ambiguity for write(0) case, because (0) can be a pointer or an integer
+        inline size_t write(short t) { return write((uint8_t)t); }
+        inline size_t write(unsigned short t) { return write((uint8_t)t); }
+        inline size_t write(int t) { return write((uint8_t)t); }
+        inline size_t write(unsigned int t) { return write((uint8_t)t); }
+        inline size_t write(long t) { return write((uint8_t)t); }
+        inline size_t write(unsigned long t) { return write((uint8_t)t); }
+        // Enable write(char) to fall through to write(uint8_t)
+        inline size_t write(char c) { return write((uint8_t) c); }
+        inline size_t write(int8_t c) { return write((uint8_t) c); }
+
+        size_t printf(const char * format, ...)  __attribute__ ((format (printf, 2, 3)));
+        size_t print(const std::string &);
+        size_t print(const char[]);
+        size_t print(char);
+        size_t print(unsigned char, int = DEC);
+        size_t print(int, int = DEC);
+        size_t print(unsigned int, int = DEC);
+        size_t print(long, int = DEC);
+        size_t print(unsigned long, int = DEC);
+        size_t print(double, int = 2);
+
+        size_t println(const std::string &s);
+        size_t println(const char[]);
+        size_t println(char);
+        size_t println(unsigned char, int = DEC);
+        size_t println(int, int = DEC);
+        size_t println(unsigned int, int = DEC);
+        size_t println(long, int = DEC);
+        size_t println(unsigned long, int = DEC);
+        size_t println(double, int = 2);
+        size_t println(void);
+
+        virtual void flush() { /* Empty implementation for backward compatibility */ }
+};
+
+#endif
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,10 +1,12 @@
 #include <mbed.h>
 #include <pid.h>
 #include <DHT.h>
+#include <LiquidCrystal_I2C.h>

 auto t_controller = PID(1, 1, 0, 2);
 auto t_sensor = DHT(PC_10, AM2302);
-auto led = DigitalOut(PA_5);
+auto led = DigitalOut(LED1);
+auto lcd = LiquidCrystal_I2C(0x20, 20, 4, I2C_SDA, I2C_SCL);

 int main()
 {
@@ -14,7 +16,8 @@ int main()
    t_controller.setSetPoint(29);
    while (true)
    {
-        if (eError::ERROR_NONE != t_sensor.readData()){
+        if (eError::ERROR_NONE != t_sensor.readData())
+        {
            printf("Error\n");
            continue;
        }