DTMF-Controlled Relay System made with the Seeeduino XIAO SAMD21

This project implements a DTMF (Dual-Tone Multi-Frequency) controlled relay system using a Seeeduino XIAO SAMD21 board. It activates a relay in response to a specific sequence of DTMF tones, making it suitable for remote control applications via audio signals, such as radio communication.

Features

• Responds to a customizable sequence of DTMF tones
• Manual activation via a physical button
• Configurable activation duration
• Uses the MT8870 DTMF decoder chip
• Implements a cycling relay pattern when activated
• Designed for the compact Seeeduino XIAO SAMD21 board

How It Works

1. Listens for a specific sequence of DTMF tones (default: 102*7777)
2. Activates a relay in a cycling pattern upon correct sequence
3. Relay alternates between ON and OFF states every 2 seconds
4. Customizable activation period (default: 60 seconds)
5. Physical button for manual trigger

Hardware Requirements

• Seeeduino XIAO SAMD21 board
• MT8870 DTMF decoder
• Relay module
• Push button or Switch
• Appropriate wiring and power supply (I'm using the MEAN WELL MDR-20-5)

Customization

Easily customize:

• DTMF activation sequence
• Pin assignments
• Activation duration
• Relay cycling pattern

Potential Applications

• Remote control of devices via radio
• Security systems with audio-based activation
• Automated systems responding to phone-based commands

License

This project is open-source and available under the MIT License. See the LICENSE file for details.

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Note: This README was created with the assistance of an AI language model (Claude) to provide a clear and concise description of the project.