# Adafruit IO LED Control

Day 83 of the 100 Days 100 IoT Projects collection. Board: Pi Pico.

Toggle an LED from Adafruit IO's cloud dashboard over MQTT on the Pico 2W. Classic MQTT pub-sub in action.

## How it works

Toggling a dashboard button on Adafruit IO publishes an MQTT message; the Pico 2W, subscribed to that feed, receives it and flips the LED. It is the canonical publish-subscribe loop — and the pattern behind nearly every cloud-controlled device you will ever build.

## What you'll learn

- MQTT publish/subscribe
- Adafruit IO feeds
- Cloud-to-device messaging
- Topic-based architecture

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

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