Locodoco
Locodoco is an open source (Soft- and Hardware) project that lets you control model trains and automate train movements. The Project consist of several Hard- and Software components. In the first stage of this project's development a "loco decoder" was built. This piece of hardware lets you control motor throttle, lights and other functions of a loco via data transmissions.
Motivation
There simply wasn't an open implementation that suited my needs. There is a well-developed open source project that implements DCC (Open DCC). Unfortunately DCC doesn't provide features like sending transmissions from locos to the controller - well, actually it does, but DCC's feedback functions are quite limited due to DDC's nature.
Another goal I want to achieve is simplicity. A typical use case for this system is a plug-and-play setup where you simply stick all the track pieces together and plug in the power. In current implementations this works as well - turnouts get their signal from the track just like the locos do. The only disadvantage is that you'll have to remember or note turnout numbers in your control panel. The ability I wanted to add to model railroading is to make the process of switching a turnout more intuitive. Once this system is fully implemented you'll be able to select the next turnout on the way of a loco.
Features
Waypoints & Positioning information
Waypoints along the track (turnouts) transmit an unique ID via infrared diodes to bypassing locos. This allows locos to transmit their position, direction and speed to the controlling devices. It may also be possible to utilize a gyroscope for more precise acceleration, deceleration information and positioning.
Independent power supply
Unlike usual systems, locos equipped with a locodoco controller can run on any track that provides between 8 and 30 Volts power AC and DC. It is possible to mix usual DCC systems with this system and have locodoco equipped locos run on DCC powered track. The only disadvantage is that you can't control DCC locos with controllers for the locodoco system. It should be possible to let locodoco Trains accept commands from DCC, though this is a question of software development - the hardware is ready for it ;)
Loco decoder
The loco decoder consists of an AVR Microcontroller (Atmega32), a RFM12 radio transceiver, an L6202 Motor controller and several other Parts. Due to its size (3x5cm), it currently only fits into rather large scale Trains (i.e. G-Scale locos).
State of the Project
Done so far
- Loco decoder Prototype board built & tested in LGB 2033 and 2060
- First decoders installed and proven to be working stable
- First pieces of software tested and run
- Finished work bootloader to wirelessly update the firmware of the controller
To be done
- Develop a turnout controller (Hard- and Software)
- Develop track nodes (for positioning information)
- Develop a controlling device (currently a simple piece of software on a pc)