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RASPBERRY PI

Project Specific

6 – 12 Hours

Partial Kit

Smart Home Solution using Smart Contract

Build a peer-to-peer smart home automation system where electrical appliances connected to a Raspberry Pi are controlled using Ethereum smart contracts deployed across Google Cloud Platform virtual machines.

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.

Raspberry Pi 3 - Model B+ 1.4Ghz 64-bit quad-core Processor with 1 GB Ram (Original) Rs. 5,400.00
5V 1 Channel Relay Module Rs. 45.00
Jumper Wire 10 Pin Male To Male 20cm Rs. 45.00
400 Points Mini Solderless Prototype PCB Breadboard High Quality Rs. 89.00
MB102 Adjustable Breadboard Power Supply Module (3.3V & 5V) for Arduino & Raspberry Pi Rs. 139.00
Jumper Wire 10 Pin Male To Female 20cm Rs. 45.00

Selected: Rs. 0.00

We don't carry yet: Electrical load

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How It Works

This project implements a decentralized smart home automation system by bridging blockchain technology with physical hardware connected to a Raspberry Pi 5. At the core of the system are Solidity smart contracts, compiled and managed via the Truffle Suite, and executed on an Ethereum network running locally via Geth nodes deployed on Google Cloud Platform virtual machines. When a user interacts with the smart contract, a backend script written in Node.js and executed using JavaScript listens for specific blockchain state changes or transaction events. Upon detecting a valid transaction confirming a state change—such as a command to turn an appliance on or off—the Node.js application signals the Raspberry Pi's General Purpose Input/Output (GPIO) pins. The GPIO pin then triggers a relay module. Because a relay acts as an electrically operated switch, its activation allows or blocks current flow to an attached electrical load, such as a light bulb. This integration ensures that physical appliances are controlled exclusively by immutable, cryptographically secure smart contracts rather than traditional centralized servers.

Why Build This

Design a decentralized, peer-to-peer IoT control architecture that eliminates single points of failure found in traditional centralized smart home servers.

Gain hands-on experience deploying and interacting with Ethereum smart contracts using industry-standard tools like Geth, Truffle, and Node.js.

Bridge software-level blockchain state changes with physical hardware automation using relay modules and single-board computers.

Real-World Application

Secure, decentralized smart home automation, tamper-proof IoT device control, and blockchain-based energy management systems.

Skills You'll Learn

Smart contract development

Decentralized application integration

GPIO pin control

Relay module interfacing

Cloud VM deployment

Asynchronous event listening

Safety Precautions

Exercise standard electrical safety precautions when connecting relays and high-voltage home appliances to the Raspberry Pi GPIO pins.

Technology Tags

BLOCKCHAIN

SMART CONTRACT

ETHEREUM

WEB3.0

IOT

CLOUD COMPUTING

GOOGLE CLOUD PLATFORM

JAVASCRIPT

SOLIDITY

NODE.JS

Frequently Asked Questions

Do I need real cryptocurrency to run this project?

No, you can configure your Geth nodes to run on a private local testnet or a development network using simulated Ether, avoiding any real financial cost.

Why is Google Cloud Platform used in this project?

GCP virtual machines host the Ethereum node environment (Geth), allowing your smart contracts to be deployed and accessed reliably in a simulated decentralized network.

Can I connect high-voltage appliances directly to the Raspberry Pi?

No, you must always use a relay module to safely isolate the low-voltage Raspberry Pi logic circuit from high-voltage electrical loads.

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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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