This project demonstrates how to control an LED diode on a Raspberry Pi Pico W through MQTT messages, with an Android app as the client.
The goal is to show IoT communication between microcontrollers and mobile devices, and how MQTT can be used for lightweight, real-time messaging.
- ✅ Toggle LED on the Raspberry Pi Pico via MQTT messages
- ✅ Publish status updates from Pico to the broker
- 🚧 Android app subscribes to messages (publishing works, but receiving still under development)
- ⚡ Uses lightweight MQTT protocol suitable for IoT applications
- Raspberry Pi Pico W
- Onboard LED (or external LED with resistor)
- MQTT Broker (e.g., Mosquitto, HiveMQ, EMQX)
- Android App (custom client for sending commands & receiving messages)
git clone https://github.com/milutin2002/mqttLedControl.git
cd mqttLedControl
cd pico
mkdir build
cd build
cmake -DWIFI_SSID="" -DWIFI_PASS="" ..
make
Configure the app to connect to the same broker (IP / hostname).
Use topic names defined in the Pico code (e.g., led/pico/set, led/pico/status).
Send on or off messages to led/control to toggle the Pico’s LED.
Pico publishes LED state updates to led/status.
Android app sends control messages and is intended to display status updates (currently in progress).
Improve UI of Android client.
MIT License – feel free to use and modify.