Hardware and IoT|

SwitchOS

Custom Arduino-based home automation system replacing traditional wall switches with relay-controlled smart switching. Controls household appliances with real-time LCD status display, wired into mains alongside existing switchboards.

Overview

A fully functional smart home controller built from off-the-shelf components for under $10. No cloud, no app — operates standalone with physical and programmable control. Designed to retrofit into existing Indian household switchboards.

Specs

MCUArduino Uno (ATmega328P)

Switching4-channel 5V relay module for mains appliances

Display16x2 LCD (HD44780) with I2C backpack

CostUnder $10 in hardware

Features

GPIO-driven relay control logic for independent appliance switching
LCD status display showing real-time ON/OFF state
Firmware in Embedded C/Arduino for relay sequencing and debounce handling
Mains isolation via relay module — low-voltage control separated from 220V AC
Expandable to serial/Bluetooth/Wi-Fi with additional modules

Tech Stack

Arduino UnoATmega328P4-Ch RelayHD44780 LCDI2CEmbedded C

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