Temperature and Humidity Monitoring Using Arduino (Data Aggregation).




Introduction: Temperature and Humidity Monitoring Using Arduino (Data Aggregation).

About: Pursuing B.E from Sinhgad College of Engineering Pune.
  • Data Aggregation

Data aggregation is any process in which information is gathered and expressed in a summary form, for purposes such as statistical analysis

Data Aggregation concept

  • Basic Introduction

A project is all about the concept of Data Aggregation.concept is to collect the data from different sensor and give it to controller. first you have to set the sensor value range. because if the sensor value goes high or low compare to set value is has to give some signal this signal is warning to the main server so that the quality is product remain same.

for example:if you have one medicine that required 30ºC temperature and 50%RH humidity for that you have to maintain required temp and humidity.for that i build this project which measure the range according you set the ranges.if any value goes high or low it gives warning ths is the concept of Data aggregation

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Step 1: Interfacing Humidity Sensor DHT11 to Arduino

DHT11 Temperature & Humidity Sensor features a temperature & humidity sensor complex with a calibrated digital signal output.it ensures high reliability and excellent long-term stability.This sensor includes a resistive-type humidity measurement component and an NTC temperature measurement component.extremely accurates,small size, low power consumption.Measurement Range:20-90%RH and 0-50 ℃.DHT11 power supply is 3-5.5V DC

DHT11 Data Sheet


Step 2: Interfacing Temperature Sensor LM35 to Arduino

LM35 data sheet

LM35 is an analogue temperature sensor IC which can measure a
temperature range of -55 to 150°C. Its output voltage varies 10mV per °C change in temperature.

Lm35 is three pin sensor +5v ,GND ,OUTPUT

For example, if the temperature is 32°C, the output voltage will be 32 x
10mV = 320mV. ADC is used to convert the analogue output voltage of the LM35 to a proportional 8 bit digital value

  • LM35 program:

float temp;

int tempPin = 0;

void setup() {



void loop() {

temp = analogRead(tempPin);

temp = temp * 0.48828125;

lcd.print("TEMPRATURE = ");






Step 3: Interfacing Keypad to Arduino

Matrix Keypad – reducing the pins from 8 digital to 1 analog on Arduino

#define analogPin 0

AnalogMatrixKeypad AnMatrixKeypad(analogPin);

void setup(){



void loop(){

char Key = AnMatrixKeypad.readKey();




matrixkeypad lib

Step 4: Interface (16*2) LCD to Arduino

The LiquidCrystal library allows you to control LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually find them by the 16-pin interface.

Pin 1 to Arduino GND
Pin 2 to Arduino 5V

Pin 3 to GND

Pin 4 to Arduino pin 12

Pin 5 to Arduino GND

Pin 6 to Arduino pin 11

Pin 11 to Arduino pin 5

Pin 12 to Arduino pin 4

Pin 13 to Arduino pin 3

Pin 14 to Arduino pin 2

Step 5: LED to Arduino

simply do as shown in diagram


here is the final data of project it gives A final code and data just watch it and do your project..

the .rar file also has the proteus semulation of project and all data of project. one thing keypad sometimes not work properly. and the simulation is perfect only dht11 not working in proteus it work on hardware. the problem behind this i dont no. i try all the possibility but it not work on proteus.

All project data

Sensors Contest 2017

Participated in the
Sensors Contest 2017

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    3 years ago

    Thanks for sharing :)