Wiki – Assorted Info and Articles

Airwire Operation and the AirRx

The Airwire system is actually very simple, it is DCC over the air on the 915Mhz radio band. The AirRx receives this signal and passes it to the Cytron power driver. The Cytron can supply up to 10 Amps of DCC allowing it to power any of the large scale decoders with plenty to spare. This is about twice the capacity of the CVP Convrtr60. The following diagram shows the basic configuration in this mode: While the above mode is…

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AirRx DCC Connections

Above is the basic diagram of the system. The T5000 transmits DCC over the air. The AirRx picks up that signal and passes it out the ‘D’ output pin on the receiver. This is the logic level DCC signal. To use this to drive a standard decoder, it needs to be ‘boosted’ up to a higher voltage. In G scale, this is typically 14.8v which corresponds to a 4 cell Lipo pack. The booster is actually a motor driver which…

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Assembling the ProMini Air Receiver/Transmitter

Introduction Our goal for offering the ProMini Air receiver/transmitter is to allow those interested in “dead-rail” (radio control and battery power of a model railroad locomotive) to build a wireless, DCC compatible transmitters inexpensively and receivers for radio-control of model railroad locomotives in the US/Canadian 915MHz ISM band – the same band and protocol as the Tam Valley Depot and CVP Airwire¬†transmitters and receivers (and the QSI Gwire receiver and no longer manufactured NCE GWire Cab¬†wireless DCC throttle). You can…

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Cheap Airwire Dead Rail DCC

With a few inexpensive parts, it’s possible to put together a very reasonable Airwire Battery DCC system using off the shelf components. It uses a motor controller rated at 13 Amps so it will drive any DCC decoder on the market. No programming required. First you need one of these- GWire Receiver And one of these for $10 Motor Driver One of these for $8 5v Converter The first thing you have to do is solder some leads to the…

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Building the ProMini Air

Building the ProMini Air Click on any of the photos to show a larger image All the parts. The CC1101 modem board is in the upper left, you can get it here: Amazon CC1101 Board. The ProMini is available from many places but I got this one from Adafruit, here is a link: adafruit 16mhz Arduino ProMini First step is to solder on the Voltage Regulator. Use an alligator clip (or similar) to hold the small chip in place and…

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Xbee Network Web App

This is an application that allows you to scan the xbee network of the protothrottle. You can see and configure all of your Protothrottle equipped receivers. It runs on a Raspberry Pi Zero W. The Rpi is configured as a standalone web server with it’s own private network and wifi access. You connect to it and then the RpiZW (via an Xbee on a USB port) talks to the Protothrottle Network. Since it is a web app, you can use…

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Debugging the Logic

Since all of this is somewhat of a ‘black box’ kind of thing, I’ve written up some tips and hints below to help you understand what is going on a bit better and a way to see the signals. First of all, DCC is not a big mystery as some have tried to make it. It can get a bit weird if you are wiring large layouts using track power as in the smaller scales, but we are driving a…

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Bluetooth Receiver

Our bluetooth receiver is based on the same design as the protothrottle (xbee) receiver but uses a different network chip and firmware. We have a custom Android Application that allows you to control your locomotive with your Android Phone (we do not support Apple iOS, sorry) I should also mention that other than bug fixes, there are no further releases planned for this module. Receiver The Receiver is a small board that installs in your locomotive. It processes the bluetooth…

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Airwire Receivers

We offer several options for Airwire users.   Receivers, Transmitters and Protothrottle Translators. Connections and Operation are here. AirRx Receiver The AirRx is a small board that installs in your locomotive. It receives the Airwire Signals and outputs logic level DCC. The signal is fed into a DCC power amp which drives the DCC decoder. The Receiver also has 2 servo outputs, these can be used with Electronic Speed Controllers or used for the throttle and direction for live steam…

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