How to Connect your Arduino to Loconet
You are going to have to make 1 little circuit, or geta friend to make it for you.
Fortunatly it is a very simple circuit. In time I will put a how to step by step up here for you.
Under the downloads page, you will find the drawing and the link to where I found it. It is in the LocoNet download link
These parts can be purchased from your local electronics store. In australia this would be Jaycar.
I strongly suggest you buy the IC socket, it means you wont accidently damage the IC (LM311)
The components are less than $10, and the vari board is about $6 in Australia. Of course ebay it would all be a lot cheaper but you would be buyinga larger quantity.
Component List
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1 x LM311 Comparator
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1 x 2N3904 Transistor
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R21 = 22K Resistor
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R22 = 10K Resistor
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R23 = 47K Resistor
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R24 = 150K Resistor
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R25 = 4.7K Resistor
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A piece of Vari Board, the small one is fine (3" x 3"
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Optional 8 pin IC socket