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Smart water heater using Arduino DIY Project

Smart Water Heater Using Arduino – DIY Project

With the rise of home automation, everyday appliances like fans, lights, and even water heaters are getting smarter. In this DIY project, we’ll learn how to create a Smart Water Heater using Arduino. This system allows you to automatically control the heater based on temperature readings, schedule timings, or even control it remotely.

This project is ideal for anyone looking to make their home more energy-efficient, safe, and convenient.

What is a Smart Water Heater?

A smart water heater is an advanced system that monitors water temperature in real-time and allows automated or manual control over heating. With the help of Arduino and temperature sensors, you can set the desired water temperature, turn the heater ON/OFF automatically, and even display the temperature on an LCD screen.

The system not only improves comfort but also saves electricity by preventing unnecessary heating.

Components Required

Here are the basic components you'll need to build this project:

Arduino Uno or Nano

• Arduino Uno or Nano

DS18B20 waterproof temperature sensor

• DS18B20 waterproof temperature sensor

Relay module (to control the heater)

• Relay module (to control the heater)

16x2 LCD display with I2C module

• 16x2 LCD display with I2C module

Push buttons (for setting temperature)

• Push buttons (for setting temperature)

Power supply (5V for Arduino, 220V for heater)

• Power supply (5V for Arduino, 220V for heater)

Water heater (geyser or coil)

• Water heater (geyser or coil)

Jumper wires and breadboard

• Jumper wires and breadboard

Working Principle

The DS18B20 sensor continuously monitors the water temperature. The Arduino reads this data and compares it with the user-set temperature.

If the water is below the set temperature, Arduino activates the relay module, which turns ON the heater.

• If the water is below the set temperature, Arduino activates the relay module, which turns ON the heater.

Once the temperature reaches the desired level, the relay turns OFF the heater automatically.

• Once the temperature reaches the desired level, the relay turns OFF the heater automatically.

The current temperature and heater status can be displayed on the LCD screen.

• The current temperature and heater status can be displayed on the LCD screen.

Optional buttons can be added to adjust the temperature threshold manually.

• Optional buttons can be added to adjust the temperature threshold manually.

Circuit Connections

DS18B20 Sensor:

VCC → 5V (Arduino)

• VCC → 5V (Arduino)

GND → GND

• GND → GND

Data → D2 (with 4.7kΩ pull-up resistor)

• Data → D2 (with 4.7kΩ pull-up resistor)
• DS18B20 Sensor:VCC → 5V (Arduino)GND → GNDData → D2 (with 4.7kΩ pull-up resistor)

Relay Module:

IN → D7 (Arduino)

• IN → D7 (Arduino)

VCC → 5V

• VCC → 5V

GND → GND

• GND → GND
• Relay Module:IN → D7 (Arduino)VCC → 5VGND → GND

LCD with I2C:

SDA → A4

• SDA → A4

SCL → A5

• SCL → A5
• LCD with I2C:SDA → A4SCL → A5

Arduino Code Overview

The code uses the OneWire and DallasTemperature libraries to handle the DS18B20 sensor, and LiquidCrystal_I2C library for the LCD. The relay is triggered based on the sensor's temperature reading.

Here’s a short example logic:

cpp

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if (temperature < setTemp) {
digitalWrite(relayPin, HIGH); // Turn heater ON
} else {
digitalWrite(relayPin, LOW); // Turn heater OFF
}

cpp

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if (temperature < setTemp) {
  digitalWrite(relayPin, HIGH);  // Turn heater ON
} else {
  digitalWrite(relayPin, LOW);   // Turn heater OFF
}

The LCD displays:

vbnet

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Temp: 42.5°C
Heater: ON

vbnet

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Temp: 42.5°C
Heater: ON

Advantages of Smart Water Heater

Energy Saving: Automatically turns off once the desired temperature is reached.

• Energy Saving: Automatically turns off once the desired temperature is reached.

Safety: Reduces overheating risks.

• Safety: Reduces overheating risks.

Customizable: Can be upgraded with Wi-Fi, Bluetooth, or mobile control.

• Customizable: Can be upgraded with Wi-Fi, Bluetooth, or mobile control.

Cost-Effective: Uses inexpensive and readily available components.

• Cost-Effective: Uses inexpensive and readily available components.

Conclusion

Creating a Smart Water Heater using Arduino is a practical and educational DIY project. It teaches you about sensors, relays, and automation, while offering a real-world benefit. Whether you're building it for your home or as a college project, this smart system is sure to impress with its functionality and simplicity.

Make sure to handle high-voltage wiring carefully and use proper insulation and casing for safety.