# Blynk Relay Control

Day 18 of the 100 Days 100 IoT Projects collection. Board: Pi Pico.

Control a relay from the Blynk IoT app on your phone via the Pico 2W. Cloud dashboards with zero HTML required.

## How it works

Instead of building a web page, you drop a button widget into the Blynk app and link it to a virtual pin. Pressing it sends a message through Blynk's cloud to the Pico 2W, which toggles the relay. No HTML, no hosting — the cloud handles the plumbing.

## What you'll learn

- IoT cloud platforms
- Virtual pins
- App-to-device messaging
- No-code dashboards

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

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