Réaliser un décodeur d'accessoires en analysant les trames digitales DCC à l'aide d'un Arduino

🔧 Decoding DCC Frames with Arduino – Complete Tutorial 🚂 In this video, we'll discover how to use an Arduino board to decode DCC frames sent by a digital railway control system. The goal: to enable your Arduino to respond to DCC commands—to control a signal, a motor, a turntable, or any other accessory on your model railway! 🔗 Useful Resources 🔹 Complete tutorial on the SMCF club website: https://www.modelisme-ferroviaire-rou... 🎯 Project Objective This setup transforms your Arduino into a DCC accessory decoder. It listens to the DCC signals circulating on the track, interprets them, and executes programmed actions: • Turn on an LED or a mechanical signal • Control a servo motor • Rotate a motorized bridge • Or trigger any animation on the layout ⚙️ Required Materials Here are the components used in this tutorial: • 1× Arduino UNO R3 • 1× 6N137 optocoupler (electrical isolation is essential) • 1× 1 kΩ (1 W) resistor • 2× 10 kΩ resistors • 1× 1N4148 diode Breadboard or small printed circuit board (Optional: terminal blocks for a cleaner assembly) 💡 The 6N137 optocoupler protects the Arduino from DCC current while transmitting the pulses necessary to read the frames. 🧠 Software Side The project relies on the DCC_Decoder library from MynaBay, available on GitHub. It allows the Arduino to: • Detect DCC frames, • Identify accessory addresses and automatically respond to commands from the control unit. 🔌 Schematic and Operation The DCC signal passes through the optocoupler before arriving at pin 2 of the Arduino (interrupt input). Each pulse corresponds to one bit of the digital frame. The Arduino reads and decodes these frames to execute the function associated with a given DCC address. 💡 Practical Example This tutorial demonstrates a simple accessory decoder code: • DCC Address: 100 • Two LEDs (red and green) indicate the accessory's status When a frame matches this address, the Arduino turns the corresponding LED on or off. This is an excellent starting point for verifying that your setup works before moving on to more complex projects (turntables, signals, barriers, etc.). 🚀 Advantages of this Method ✅ Economical — an Arduino costs less than €20 ✅ Flexible — everything is customizable in the code ✅ Scalable — perfect for creating your own custom DCC modules ✅ Compatible — works with major control units and software (Rocrail, i-Train, TrainController, etc.) #tutorial #trains #arduino