This is the example code for LiquidCrystal Display
/*
LiquidCrystal Library - display() and noDisplay()
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 uses the
display() and noDisplay() functions to turn on and off
the display.
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
* 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/LiquidCrystalDisplay
*/
// 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() {
// Turn off the display:
lcd.noDisplay();
delay(500);
// Turn on the display:
lcd.display();
delay(500);
}
and below is the example code for LiquidCrystal SetCursor
/*
LiquidCrystal Library - setCursor
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 to all the positions of the LCD using the
setCursor() method:
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
* 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/LiquidCrystalSetCursor
*/
// 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);
// these constants won't change. But you can change the size of
// your LCD using them:
const int numRows = 2;
const int numCols = 16;
void setup() {
// set up the LCD's number of columns and rows:
lcd.begin(numCols, numRows);
}
void loop() {
// loop from ASCII 'a' to ASCII 'z':
for (int thisLetter = 'a'; thisLetter <= 'z'; thisLetter++) {
// loop over the columns:
for (int thisRow = 0; thisRow < numRows; thisRow++) {
// loop over the rows:
for (int thisCol = 0; thisCol < numCols; thisCol++) {
// set the cursor position:
lcd.setCursor(thisCol, thisRow);
// print the letter:
lcd.write(thisLetter);
delay(200);
}
}
}
}
Which one should I use
and
How am I supposed to change the code into my code?
*The change I tried is still in comment mode because I'm still confused with it.
#include <LiquidCrystal.h>
#include "DHT.h" //including the dht22 library
#define DHTPIN 9 //Declaring pin 9 of arduino for the dht22
#define DHTTYPE DHT22 //Defining which type of dht22 we are using (DHT22 or DHT11)
LiquidCrystal lcd(7,6,5,4,3,2); // Creates an LCD object. Parameters: (rs, enable, d4, d5, d6, d7)
DHT dht(DHTPIN, DHTTYPE); //Declaring a variable named dht
const int numRows = 2;
const int numCols = 16;
void setup() { //Data written in it will only run once
Serial.begin(9600); //setting the baud rate at 9600
dht.begin(); //This command will start to receive the values from dht22
lcd.begin(16,2);
}
void loop() { //Data written in it will run again and again
float hum = dht.readHumidity(); //Reading the humidity and storing in hum
float temp = dht.readTemperature(); //Reading the temperature as Celsius and storing in temp
float fah = dht.readTemperature(true);
if (isnan(hum) || isnan(temp) || isnan(fah)) {
Serial.println("Failed to read from DHT sensor!");
return;
}
float heat_index = dht.computeHeatIndex(fah, hum);
float heat_indexC = dht.convertFtoC(heat_index);
Serial.print("Humidity: "); //Writing the humidity on the serial monitor
Serial.print(hum); //Writing the humidity value stored in hum on the Serial monitor
Serial.print(" %\t");
Serial.print("Temperature: "); //Writing the temperature on the serial monitor
Serial.print(temp); //Writing the value of temperature on the serial monitor
Serial.print(" °C ");
Serial.print(fah);
Serial.print(" °F\t");
Serial.print("Heat index: ");
Serial.print(heat_indexC);
Serial.print(" °C ");
Serial.print(heat_index);
Serial.println(" °F ");
/* // loop from ASCII 'a' to ASCII 'z':
for (int hum = 'a'; hum <= 'z'; thisLetter++) {
// loop over the columns:
for (int thisRow = 0; thisRow < 2; thisRow++) {
// loop over the rows:
for (int thisCol = 0; thisCol < 16; thisCol++) {
// set the cursor position:
lcd.setCursor(16, 2);
// print the letter:
lcd.write(hum);
delay(2000);
}
}
}
*/
}
