Es project sensor

LCD humidity temperatureLCD humidity temperature
readerreader
Presented byPresented by::
Waed shagareen Ayat bdyratWaed shagareen Ayat bdyrat

Presentation outline
• Project purpose
• Project idea
• Project component
• Project block diagram
• Project Mechanism
• Project programming

Project purpose
• Humidity and temperature are common
parameters to measure environmental
conditions
• LCD humidity and temperature reader
useful in remote weather stations, home
environment control systems, and
agricultural/garden monitoring systems.

Project idea
• In this Arduino based project we are going
to measure ambient temperature and
humidity then display it on a 16x2 LCD
screen.

Project component
• Arduino Uno
• DHT11 temperature and humidity sensor
• Backlit LCD (16x2) characters Liquid
Crystal Display
• Breadboard Electronic Components
• Jumper cables
• potentiometer
• ohm resistor

Project component
• Arduino Uno
Arduino is an open-source electronics prototypingArduino is an open-source electronics prototyping
platform based on flexible, easy-to-use hardwareplatform based on flexible, easy-to-use hardware
and softwareand software

DHT11 temperature and
humidity sensor
• The DHT11 humidity and temperature sensor
measures relative humidity (RH) and temperature.
• The formula for relative humidity is as follows:
Relative Humidity = (density of water vapor /
density of water vapor at saturation) x 100%
• The DHT11 uses one signal wire to transmit
sensor readings to the Arduino digitally.
•

Backlit LCD (16x2) characters Liquid
Crystal Display
• . A 16x2 LCD display is very basic
module and is very commonly used in
various devices and circuits. These
modules are preferred over seven
segments .

Project Mechanism
• DHT11 module works on serial
communication i.e. single wire
communication. This module sends
data in form of pulse train of
specific time period. Before sending
data to arduino it needs some
initialize command with a time delay.

• liquid crystal display is used for displaying
temperature and humidity which is directly
connected to arduino in 4-bit mode. Pins of
LCD namely RS, EN, D4, D5, D6 and D7 are
connected to arduino digital pin number 2,
3, 4, 5, 6 and 7. And a DHT11 sensor
module is also connected to digital pin 12
of arduino with a 5k pull-up resistor

Project Programming
• In programming using Arduino IDE , we are going
to use pre-built libraries for DHT11 sensor
and LCD display module.
• Then we have defined pins for LCD and DHT
sensor and initialized all the things in setup.
• Then in a loop by using DHT function reads DHT
sensor and then using some dht functions we
extract humidity and temperature and display
them on LCD.

Project Code
#include <dht.h>
#include <LiquidCrystal.h>
dht DHT;
#define DHT11_PIN 3
LiquidCrystal lcd(12,11,4,5,6,7);
void setup() {
// put your setup code here, to run once:
Serial.begin(9600);
lcd.begin(16,2);
lcd.setCursor(0,0);
lcd.print(" Welcome");
delay(2000);
lcd.clear();
}

void loop() {
// must issue this command to store the temp and humid data in DHT object
int chk = DHT.read11(DHT11_PIN);
int temp = DHT.temperature , humid = DHT.humidity ;
Serial.println('$');
Serial.println(temp);
Serial.println(humid);
lcd.print(temp);
lcd.print(" Celsius");
lcd.setCursor(0,1);
lcd.print(humid);
lcd.print("% Humid");
delay(8000);
lcd.clear();
lcd.print("Have a Nice Day");
lcd.setCursor(0,1);
lcd.print(" -Home Weather");
delay(4000);
lcd.clear();
}

Es project sensor

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