# Node-RED Virtual LED

Day 85 of the 100 Days 100 IoT Projects collection. Board: Pi Pico.

A Node-RED dashboard flips a virtual LED over MQTT with Mosquitto in Docker on the Pico 2W. Flow-based IoT without code.

## How it works

In Node-RED you wire a dashboard button to an MQTT output node with drag and drop — no code. Pressing it publishes to the Mosquitto broker running in Docker, and the Pico 2W's subscribed LED follows. Flow-based IoT: the program is a diagram.

## What you'll learn

- Flow-based programming
- MQTT broker setup
- No-code IoT logic
- Docker-hosted services

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

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