IoT Device Control via MQTT and Webhook
Control IoT devices like ESP32 remotely using a webpage with on/off buttons that trigger n8n webhook, MQTT publish, and GPIO toggle.
This n8n workflow demonstrates practical IoT control using MQTT protocol. A simple HTML webpage presents 'on' and 'off' buttons. Clicking a button sends the value via webhook to n8n (e.g., http://localhost:5678/webhook/pin-control?value=on). The workflow's Set node formats the payload, then the MQTT node publishes it to a cloud broker on a specified topic.
A remote ESP32 microcontroller subscribes to the broker, reads the payload, and toggles GPIO2 accordingly—turning an LED on for 'on' or off for 'off'. Includes ready-to-use webpage code and ESP32 'main.py' script. Ideal for beginners in n8n IoT automation.
Benefits include easy remote device control without custom apps, scalable to multiple devices/topics, and integration with n8n's ecosystem. Use cases: smart home lights, fitness equipment toggles (e.g., treadmill power), industrial sensors, or any GPIO-based IoT project. Saves hours of setup with pre-configured nodes and examples.
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How to import this workflow into n8n
- 1Purchase or download the workflow to get the n8n workflow JSON file.
- 2In your n8n instance, open Workflows and choose "Import from File" (or paste the JSON with Ctrl+V on the canvas).
- 3Open each node marked with a credential warning and connect your own accounts and API keys.
- 4Run the workflow once manually to verify the data flow, then toggle it to Active.
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