# Bluetooth LED Control

Day 13 of the 100 Days 100 IoT Projects collection. Board: Pi Pico.

Send on/off commands from your phone over an HC-05 Bluetooth link to toggle an LED on the Pico 2W. UART messaging and wireless control basics.

## How it works

Your phone pairs with the HC-05 module, which appears as a wireless serial port. Commands typed in a Bluetooth terminal app travel over that link as text; the Pico reads each line over UART and switches the LED when it sees the on or off keyword.

## What you'll learn

- UART serial protocol
- Bluetooth SPP profile
- Text command parsing
- Phone-to-board wireless link

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

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