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Category: Electronics

Z21 + DCC-EX and iTrain (low-cost signal control 0.7€/output)

Posted on 2026-01-182026-01-30 by rmolins

This post explains how to increase the number of controllable signals of a model railway from iTrain in an economical way, with an approximate cost of 0.7€/output using DCC-EX. I control the locomotives and turnouts with the ROCO Z21 application or from iTrain. The problem is that to control traffic signals and building lights to…

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DIY Programming on siding track with Z21 Starter

Posted on 2025-10-132026-02-01 by rmolins

I sometimes want to program CV to one locomotive without the need to remove other locomotives from the track (POM). To avoid this, added a siding with a DPDS connected to the Z21 white. This allows to bring a loco to the siding, change the switch, program the loco and after changing the switch again…

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How to build a cheap onboard live video train (FPV)

Posted on 2024-11-032026-01-30 by rmolins

Creating a cheap and easy setup to view your model railroad from a cabin can be achieved with basic FPV drone equipment. This is not meant to be realistic, although it can be hidden inside a container. Material needed cost approx 50 euros: The layout is simple: Can be mounted in a low wagon and…

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ROCO 10836 Automatic switching

Posted on 2024-11-032026-01-30 by rmolins

Instruction manual can be quite confusing. Here is my simplified circuit installation in a NOCH preformed layout. The manual states that the switch must be connected to have a more robust connection. I have not being able to avoid short circuits following the manual. Making no additional connection to the switch work well. NOCH preformed…

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ROCO 10836 Switch decoder for controlling traffic light/signals

Posted on 2024-11-032026-01-30 by rmolins

There are a various way to control the signalling on a layout. One possibility is to use the same P and N (rails) to have it fully integration inside the DCC addressing. For this option and using ROCO devices, the layout and material needed is: It is compulsory to connect P and DCC from the…

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