# Relay Control Web Server

Day 17 of the 100 Days 100 IoT Projects collection. Board: Pi Pico.

Flip a relay from any browser over Wi-Fi using the Pico 2W's smooth web interface. The foundation of every web-controlled appliance project.

## How it works

Tapping the on-screen switch sends an HTTP request to the Pico W, which energizes the relay coil. The relay's contacts then close the separate high-voltage circuit for the appliance, keeping mains power physically isolated from the low-voltage board.

## What you'll learn

- Relay electrical isolation
- Web-controlled switching
- Active-low relay logic
- Mains safety separation

Full project (code, wiring diagram, Wokwi simulation): https://github.com/kritishmohapatra/100_Days_100_IoT_Projects/tree/main/IoT_Relay_Control_Web_Server_(Raspberry_Pi_Pico_2W)

Summary by SkillShop. Code and diagrams belong to the original repo.