Temperature Level Monitoring & Auto Cooling System

This Project explains how to build a temperature measurement unit for condition monitoring purposes with Automatic Cooling System.

This project can be applied to various type of applications including ICs, Transistors, Transformers, or any other equipment which dissipate heat.

Temperature measurement is very useful when keeping track of an equipment condition for its proper operation & longer life span.

In this Project we have chosen a transformer for its temperature monitoring.

Heat is measured using temperature sensor & displayed on LCD module.

If the heat is under or equals to the safe temperature value(specified in the code), the LCD module will display the condition is normal & the current temperature value. Relay will remain at normally open(NO) position.

If the heat is above the safe temperature value, the LCD will display the overheating warning and the alarm will be ON. Relay will operate & NO terminals will be closed. The fan will be ON.

The fan will be turned on until the temperature level reduce back to normal value.

Tools & Components

1 X Arduino Nano

1 X Relay Module(5V)

1 X 12V Fan Unit(High Flow)

1 X 16x2 LCD Module

1 X 10K Potentiometer

1 X Buzzer speaker

1 X DS18B20 Temperature Sensor

1 X 2.2K Ohm Resistor

12V/1A DC Power Supply Unit

Connecting wires

Connecting Components

LCD Module RS Pin – Arduino Pin A0

LCD Module EN Pin – Arduino Pin A1

LCD Module D4 Pin – Arduino Pin A2

LCD Module D5 Pin – Arduino Pin A3

LCD Module D6 Pin – Arduino Pin A4

LCD Module D7 Pin – Arduino Pin A5

LCD Module VEE Pin – Potentiometer Sig. Pin

Relay Sig. Pin – Arduino Pin D03

Buzzer Terminal (+) – Arduino Pin D11

Temperature Sensor Sig Pin – Arduino Pin D12

2.2K ohm resistor is connected between (+5V) terminal & DS18B20 Sig. Pin

+12V Power supply terminal to Arduino Vin Pin

Arduino Code

//2020 CraftyBin.blogspot.com
//Author : Chathura H.

#include <OneWire.h>
#include <DallasTemperature.h>
#include <LiquidCrystal.h>

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

#define ONE_WIRE_BUS 12
OneWire oneWire(ONE_WIRE_BUS);

DallasTemperature sensors(&oneWire);
float Celsius = 0;

void setup() {
sensors.begin();
Serial.begin(9600);
lcd.begin(16, 2);
pinMode(3,OUTPUT);
pinMode(11,OUTPUT);

lcd.print("Measuring Temp.: ");
lcd.print(Celsius);
lcd.print("C ");
lcd.clear();
delay(1);

digitalWrite(3,LOW);
digitalWrite(11,LOW);
}

void loop() {
sensors.requestTemperatures();
Celsius = sensors.getTempCByIndex(0);
delay(1);
Serial.print(Celsius);
Serial.print(" C ");
delay(1);

if(Celsius < 50){
lcd.print("Temp. Level : ");
lcd.print(Celsius);
lcd.print("C ");
lcd.clear();
delay(1);

lcd.setCursor(0,1);
lcd.print("Normal : ");
lcd.print(Celsius);
lcd.print("C ");
lcd.clear();
delay(500);

digitalWrite(3,LOW);
digitalWrite(11,LOW);
}

else if(Celsius >= 50){
lcd.print("Temp. Level : ");
lcd.print(Celsius);
lcd.print("C ");
lcd.clear();
delay(1);

lcd.setCursor(0,1);
lcd.print("Overheating: ");
lcd.print(Celsius);
lcd.print("C ");
lcd.clear();
delay(500);

digitalWrite(3,HIGH);
digitalWrite(11,HIGH);
}
}

Safety First !

Always Connect the power supply if you are absolutely sure that the components are connected correctly without changing polarity and short circuited the wiring.

Even if it seems nothing is wrong : DOUBLE CHECK EVERYTHING !

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