Project Hub /IoT & Connected Devices/Smart Home & Building Automation/Proximity Sensor Switch: Wireless Electric Load Management

Beginner

ARDUINO

₹500 – ₹1,500

3 – 6 Hours

Complete Kit

Proximity Sensor Switch: Wireless Electric Load Management

An Arduino-based low-cost proximity sensor switch designed to safely control electrical loads and appliances wirelessly, preventing electrocution hazards in industrial and domestic settings.

Originally published on ElectronicsForU

View original tutorial

Parts You'll Need

This project is sourced from another site, not written by us — this list is our best match of their components against what we stock, not a verified bill of materials. Always check the original blog (linked above) for the actual parts list before buying.

Arduino Nano C Type V3 ATMEGA328 with Soldered Headers Rs. 608.00
IR Proximity Sensor Module With Pot Rs. 55.00
5V 1 Channel Relay Module Rs. 45.00
I2C Module for 16x2 (1602) Character LCD Rs. 109.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

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How It Works

The Proximity Sensor Switch system centers around an Arduino Nano microcontroller that orchestrates input from an infrared (IR) sensor module and outputs status to an I2C LCD screen while toggling a 5V relay module. The IR sensor module continuously monitors the immediate environment for the presence of a user or object; when a reflective surface or hand approaches within a specific range, the sensor outputs a digital or analog signal to the Arduino Nano. Upon receiving this detection signal, the microcontroller processes the event and communicates with the RG1602A LCD I2C display using the I2C protocol to update the visual interface, displaying real-time operational status. Simultaneously, the Arduino changes the state of a digital output pin connected to the 5V relay module. The relay acts as an electrically isolated electronic switch, using a low-voltage control signal from the Arduino to mechanically or solid-state switch a secondary circuit. This setup allows the low-voltage control logic of the microcontroller and sensors to safely interface with higher-voltage electrical loads connected through the relay module. All components are interconnected using jumper wires on a breadboard or general-purpose PCB, forming a reliable, touchless automation loop.

Why Build This

Design touchless appliance control systems to improve operator safety in industrial power plants and control rooms.

Implement low-voltage microcontroller logic to safely switch and manage heavy electrical loads like fans, coolers, or AC units.

Prototype human-machine interfaces combining sensor inputs, I2C display feedback, and relay actuation for undergraduate automation projects.

Real-World Application

Improving worker safety in industrial power plants and control rooms by eliminating the need to touch bare or loose electrical wires to operate appliances like fans, coolers, or AC units.

Skills You'll Learn

I2C communication

digital sensor interfacing

relay control and load switching

microcontroller GPIO management

LCD character display programming

Safety Precautions

Exercise caution when working with mains voltage relay modules to avoid electric shock. Ensure proper wiring insulation and disconnect power before making circuit modifications.

Technology Tags

ARDUINO

PROXIMITY SENSOR

IR SENSOR

RELAY MODULE

I2C LCD

WIRELESS CONTROL

LOAD MANAGEMENT

Frequently Asked Questions

Can this project control high-voltage appliances directly from the Arduino Nano?

No, the Arduino Nano operates at 5V logic and cannot safely handle mains voltage. Instead, the Arduino controls a 5V relay module, which provides electrical isolation to switch high-voltage loads safely.

Why is an I2C module used with the RG1602A LCD display?

The I2C backpack adapter reduces the number of required data pins from the LCD down to just two (SDA and SCL), simplifying wiring on the breadboard and saving valuable Arduino Nano digital pins for the IR sensor and relay.

What kind of power supply do I need for this circuit?

You can power the Arduino Nano and logic components via USB or a regulated 5V power supply, but ensure that any external electrical loads connected through the relay are powered separately according to their specific voltage and current requirements.

This page is part of Kitkraft's Project Hub — a curated collection of electronics & robotics projects gathered from the maker community to help students and hobbyists discover and learn to build. Kitkraft does not claim authorship of the original project, and makes no representation as to the accuracy, completeness or safety of third-party source material. The summary and "How It Works" explanation above are AI-generated, rewritten with reference to the original tutorial — not a reproduction of it. Full credit and a direct link to the original source are provided above. If you're the original creator and have a concern about how your work is represented here, please contact us and we'll address it promptly.

Kitkraft Project Hub — curated from the maker community, credited at the source.

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