| /* |
| LiquidCrystal Library - Hello World |
| |
| Demonstrates the use a 16x2 LCD display. The LiquidCrystal |
| library works with all LCD displays that are compatible with the |
| Hitachi HD44780 driver. There are many of them out there, and you |
| can usually tell them by the 16-pin interface. |
| |
| This sketch prints "Hello World!" to the LCD |
| and shows the time. |
| |
| The circuit: |
| * LCD RS pin to digital pin 12 |
| * LCD Enable pin to digital pin 11 |
| * LCD D4 pin to digital pin 5 |
| * LCD D5 pin to digital pin 4 |
| * LCD D6 pin to digital pin 3 |
| * LCD D7 pin to digital pin 2 |
| * LCD R/W pin to ground |
| * LCD VSS pin to ground |
| * LCD VCC pin to 5V |
| * 10K resistor: |
| * ends to +5V and ground |
| * wiper to LCD VO pin (pin 3) |
| |
| Library originally added 18 Apr 2008 |
| by David A. Mellis |
| library modified 5 Jul 2009 |
| by Limor Fried (http://www.ladyada.net) |
| example added 9 Jul 2009 |
| by Tom Igoe |
| modified 22 Nov 2010 |
| by Tom Igoe |
| modified 7 Nov 2016 |
| by Arturo Guadalupi |
| |
| This example code is in the public domain. |
| |
| http://www.arduino.cc/en/Tutorial/LiquidCrystalHelloWorld |
| |
| */ |
| |
| // include the library code: |
| #include <LiquidCrystal.h> |
| |
| // initialize the library by associating any needed LCD interface pin |
| // with the arduino pin number it is connected to |
| const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2; |
| LiquidCrystal lcd(rs, en, d4, d5, d6, d7); |
| |
| void setup() { |
| // set up the LCD's number of columns and rows: |
| lcd.begin(16, 2); |
| // Print a message to the LCD. |
| lcd.print("hello, world!"); |
| } |
| |
| void loop() { |
| // set the cursor to column 0, line 1 |
| // (note: line 1 is the second row, since counting begins with 0): |
| lcd.setCursor(0, 1); |
| // print the number of seconds since reset: |
| lcd.print(millis() / 1000); |
| } |
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