Kutluhan Aktar
Published © CC BY

Jar Temperature Detector and Cooling Fan

If the temperature measured by DS18B20 is above the predefined threshold, it turns the fan on automatically unless the piezodisk is pressed.

AdvancedFull instructions provided2 hours273
Jar Temperature Detector and Cooling Fan

Things used in this project

Hardware components

Arduino Nano R3
Arduino Nano R3
×1
Adafruit Waterproof DS18B20 Digital temperature sensor
Adafruit Waterproof DS18B20 Digital temperature sensor
×1
L9110 Fan Motor
×1
SparkFun Piezo Disk Sensor
×1
Resistor 4.75k ohm
Resistor 4.75k ohm
×1
Resistor 1k ohm
Resistor 1k ohm
×1
SparkFun Solder-able Breadboard - Mini
SparkFun Solder-able Breadboard - Mini
×2
Male/Female Jumper Wires
Male/Female Jumper Wires
×1
Male/Male Jumper Wires
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Hot glue gun (generic)
Hot glue gun (generic)
Soldering iron (generic)
Soldering iron (generic)

Story

Read more

Custom parts and enclosures

Fritzing File

Schematics

Schematic

Jar temperature detector and cooling fan h74qnzto6j

Code

Source Code

Arduino
         /////////////////////////////////////////////  
        //  Jar Temperature Detector and Cooling   //
       //                  Fan                    //
      //    -----------------------------        //
     //             Arduino Nano                //           
    //           by Kutluhan Aktar             // 
   //                                         //
  /////////////////////////////////////////////

// While measuring temperature on a project, you may need to act instantly to make connected parts cooler to protect the components as a fan works in a computer.
// Basically, this project is about to detecting temperature in Celsius above 25 degree to run the fan to descend it under the threshold, of course you can change it.
// Also, you will be able to monitor the temperature in Celsius and Fahrenheit along with the piezo disk sensor on the serial monitor by taking following steps down below.
//
// Connections
// Arduino Nano :           
//                                 Piezo Disk Sensor
// 5V  --------------------------- 5V
// GND --------------------------- GND
//                                 DS18B20 Temperature Sensor
// 5V  --------------------------- 5V
// D2  --------------------------- OUT
// GND --------------------------- GND
//                                 L9110 Fan Motor
// 5V  --------------------------- 5V
// GND --------------------------- GND
// D3  --------------------------- INA
// D4  --------------------------- INB


// Libraries for DS18B20 Temperature Sensor
#include <OneWire.h>
#include <DallasTemperature.h>

// Attach the bus pin to the temperature sensor.
#define ONE_WIRE_BUS 2

// Initial OneWire and DallasTemperature Libraries.
OneWire oneWire(ONE_WIRE_BUS);
DallasTemperature DS18B20(&oneWire);

// Define the piezoelectric disk pin to read.
#define piezoDisk A0

// Define INA and INB pins to change fan directions.
#define INA 3
#define INB 4

// Define variables to save values.
float Celsius, Fahrenheit;
int piezo;

// This boolean runs the fan if the temperature is above 25 Celsius.
boolean HighTemperature;

void setup() {
Serial.begin(9600);

pinMode(INA, OUTPUT);
pinMode(INB, OUTPUT);

// Activate the DS18B20.
DS18B20.begin();

}

void loop() {
get_Variables_From_Sensors();

digitalWrite(INA, LOW);
digitalWrite(INB, LOW);
// Depending on the state of the piezo disk, either end task or continue.
if(Celsius > 25 && piezo < 100){
   HighTemperature = true;
    while(HighTemperature == true){
      get_Variables_From_Sensors();
      digitalWrite(INA, HIGH);
      digitalWrite(INB, LOW);
        if(Celsius > 80){
            // At this temperature, change the fan direction opposite as an indicator.
            digitalWrite(INA, LOW);
            digitalWrite(INB, HIGH);
          }else if(Celsius < 25 || piezo > 100){
            // If temperature is below 25 Celsius, halt the task.
            HighTemperature = false;
          }
    }
}


}

void get_Variables_From_Sensors(){
  // Get data from the piezo disk.
  piezo = analogRead(piezoDisk);
  // Get temperature in Celsius and Fahrenheit from the DS18B20.
  DS18B20.requestTemperatures(); 
  Celsius = DS18B20.getTempCByIndex(0);
  Fahrenheit = DS18B20.toFahrenheit(Celsius);

  // Debug variables.
  Serial.print("Celsius: ");
  Serial.print(Celsius);
  Serial.print("\t\t");
  Serial.print("Fahrenheit: ");
  Serial.print(Fahrenheit);
  Serial.print("\t\t");
  Serial.print("PiezoDisk: ");
  Serial.print(piezo);
  Serial.print("\n");
  

}

Credits

Kutluhan Aktar

Kutluhan Aktar

13 projects • 21 followers
Physics enthusiast, Developer, Programmer and Maker.

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