Práctica 34: Sensor digital de temperatura y humedad con salida por pantalla de cristal liquido. BORRADOR

LCD

LCDpines

Conexionado LCD

• 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

Conexión: fila GND (fila -) de la breadboard --> pin 1 de la LCD (VSS)
Conexión: fila 5V (fila +) de la breadboard--> pin 2 de la LCD (VDD)+R

Conexión: fila 5V (fila +) de la breadboard--> pin 15 de la LCD (A)

Conexión: fila GND (fila -) de la breadboard --> pin 16 de la LCD (K)

Conexión: primer pin del potenciómetro---> GND de la breadboard (fila -)

Conexión: pin de en medio potenciómetro --> pin 3 de la pantalla LCD (VO)

Conexión: tercer pin del potenciómetro---> 5V de la breadboard (fila -)

Conexión: pin 5 de la LCD (RW) --> GND de la breadboard (fila -)

Programa LCD

/*

  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

 * 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

 This example code is in the public domain.

 http://www.arduino.cc/en/Tutorial/LiquidCrystal

 */

// include the library code:

#include

// initialize the library with the numbers of the interface pins LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

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);

}

Programa LCD+DHT
 

// Example testing sketch for various DHT humidity/temperature sensors

// Written by ladyada, public domain

#include "DHT.h"

#include

#define DHTPIN 8     // what pin we're connected to

// Uncomment whatever type you're using!

//#define DHTTYPE DHT11   // DHT 11

#define DHTTYPE DHT11   // DHT 22  (AM2302)

//#define DHTTYPE DHT21   // DHT 21 (AM2301)

// Connect pin 1 (on the left) of the sensor to +5V

// NOTE: If using a board with 3.3V logic like an Arduino Due connect pin 1

// to 3.3V instead of 5V!

// Connect pin 2 of the sensor to whatever your DHTPIN is

// Connect pin 4 (on the right) of the sensor to GROUND

// Connect a 10K resistor from pin 2 (data) to pin 1 (power) of the sensor

// Initialize DHT sensor for normal 16mhz Arduino

DHT dht(DHTPIN, DHTTYPE);

// NOTE: For working with a faster chip, like an Arduino Due or Teensy, you

// might need to increase the threshold for cycle counts considered a 1 or 0.

// You can do this by passing a 3rd parameter for this threshold.  It's a bit

// of fiddling to find the right value, but in general the faster the CPU the

// higher the value.  The default for a 16mhz AVR is a value of 6.  For an

// Arduino Due that runs at 84mhz a value of 30 works.

// Example to initialize DHT sensor for Arduino Due:

//DHT dht(DHTPIN, DHTTYPE, 30);

LiquidCrystal lcd(12, 11, 5, 4, 3, 2);

void setup() {

    lcd.begin(16, 2);

  lcd.println("Humed Temperatura");

  dht.begin();

}

void loop() {

  // Wait a few seconds between measurements.

  delay(1000);

  // Reading temperature or humidity takes about 250 milliseconds!

  // Sensor readings may also be up to 2 seconds 'old' (its a very slow sensor)

  float h = dht.readHumidity();

  // Read temperature as Celsius

  float t = dht.readTemperature();

  // Read temperature as Fahrenheit

  float f = dht.readTemperature(true);

 

  // Check if any reads failed and exit early (to try again).

  if (isnan(h) || isnan(t) || isnan(f)) {

    Serial.println("Failed to read from DHT sensor!");

    return;

  }

  // Compute heat index

  // Must send in temp in Fahrenheit!

  float hi = dht.computeHeatIndex(f, h);

 

  lcd.setCursor(0, 1);

  lcd.print(h);

  

   lcd.setCursor(6, 1);

    lcd.print(t);

     

     lcd.setCursor(12, 1);

    lcd.print(f);

 

}

Fotos del montaje:

Conexión Arduino DHT11+LCD

Conexión LCD 

Conexión Arduino-Protoboard-LCD+DHT