Marklin analog set control via Arduino

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Marklin analog set control via Arduino

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salem		#1 Posted : 10 April 2011 15:04:14(UTC) Retweet
Joined: 10/04/2011(UTC) Posts: 4 Location: NL		Hi I got today an old set of Marklin (analogue HO format) and like to use Arduino to control it like forward, backward, speed? Any ideas? Thnx a lot saw this in youtube and wonder how he did it! the one in the video is analogue, right? salem attached the following image(s):


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tiono		#2 Posted : 11 April 2011 02:26:50(UTC) Retweet
Joined: 09/02/2010(UTC) Posts: 234		The video on youtube showing Marklin Z, which is using DC analogue. While Marklin HO 3-rail is using AC (and drawing higher current than Z-scale). If your Marklin HO is the old 2-rail DC, then you may be able to control using Arduino easily by connecting its PWM output to a power transistor as switch, plus a capacitor to smoothen the voltage. But if your Marklin HO is 3-rail AC, then it will be complicated since you have to generate 50/60Hz AC voltage to drive the train.
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H0		#3 Posted : 11 April 2011 16:52:03(UTC) Retweet
Joined: 16/02/2004(UTC) Posts: 15,267 Location: DE-NW		Originally Posted by: tiono But if your Marklin HO is 3-rail AC, then it will be complicated since you have to generate 50/60Hz AC voltage to drive the train. That depends on the loco. The old stuff with mechanical reverse units (MRU) has AC/DC motors that will run fine on AC or DC (even with PWM). Reversing voltage will be a problem. MRU can be replaced by two diodes for DC operation. Many decoders won't support DC PWM operation. But a typical "old analogue set" has no decoders.
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1 user liked this useful post by H0		salem
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salem		#4 Posted : 12 April 2011 19:15:12(UTC) Retweet
Joined: 10/04/2011(UTC) Posts: 4 Location: NL		Originally Posted by: tiono The video on youtube showing Marklin Z, which is using DC analogue. While Marklin HO 3-rail is using AC (and drawing higher current than Z-scale). If your Marklin HO is the old 2-rail DC, then you may be able to control using Arduino easily by connecting its PWM output to a power transistor as switch, plus a capacitor to smoothen the voltage. But if your Marklin HO is 3-rail AC, then it will be complicated since you have to generate 50/60Hz AC voltage to drive the train. I have updated the message with a couple of pictures. So I think it is a 3--rail analogue system. The Transformer indicates that AC alternative to be used only!


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salem		#5 Posted : 12 April 2011 19:41:19(UTC) Retweet
Joined: 10/04/2011(UTC) Posts: 4 Location: NL		I was advised to use a MOSFET to make this happen but need to see a circuit so I don't burn anything! Was looking at this circuit .. MOSFET Circuit with Arduino Also read that The AC 3-rail would also work with DC ( from Battery or Arduin PWM ), Is this true. Thanks for your participation in this discussion


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tiono		#6 Posted : 13 April 2011 01:29:12(UTC) Retweet
Joined: 09/02/2010(UTC) Posts: 234		You have to test whether your locomotive really can work with DC. If it really work with DC, then put a power-switching circuit after the PWM output. The circuit can be something like this: http://www.picotech.com/applications/pwm_drivers/#chap7
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