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BlueRailTrains/Bachmann BlueTooth Train Control
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 Posted: Wed Jun 8th, 2016 05:47 pm
   
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davecttr
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Question, how do you protect against low voltage with a bluerail board?

I want to use a bluerail board with a 9V or 12V voltage regulator and a 2S lipo pack with nominal 7.4V output. How do I protect the batteries against discharging too much? As I understand it the board does not have low voltage protection like a Deltang Rx

Or do I have to use six 1.2V NiMh cells instead?



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 Posted: Wed Jun 8th, 2016 07:00 pm
   
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Helmut
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You connect protection circuitry to the cells, if they don't come with it already.



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 Posted: Wed Jun 8th, 2016 09:03 pm
   
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Bob D
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davecttr wrote: Question, how do you protect against low voltage with a bluerail board?

I want to use a bluerail board with a 9V or 12V voltage regulator and a 2S lipo pack with nominal 7.4V output. How do I protect the batteries against discharging too much? As I understand it the board does not have low voltage protection like a Deltang Rx

Or do I have to use six 1.2V NiMh cells instead?

According to their site, the battery they recommend and sell has a board for low voltage protection on them:

BLUERAIL BATTERY

If you use some other board I guess you'd have to put a protection circuit of some kind in yourself, if possible.  Is there such a thing?

I'm using NiMh 7.6v packs and as of now, don't have any protection that I'm aware of.

BobD.



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 Posted: Thu Jun 9th, 2016 07:00 am
   
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Helmut
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The Lipos, except the ones sold for the Aeroplane R/C field, come with that protection already built in. The site I linked to shows what to look for in order to find out whether there's protection or not. Last not least, the seller normally states that in the product description.



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 Posted: Thu Jun 9th, 2016 07:13 am
   
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davecttr
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I am confused about this. If protection built into the battery cuts the power at say 3V and you have 2 batteries in series surely the protection circuitry never sees 3V because the pair are supplying 6V ?

Maybe the answer is to see how the R/C aircraft hobby protects 2S and 3S batteries.



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 Posted: Thu Jun 9th, 2016 07:59 am
   
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Tony Walsham
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Dave, the two batteries have a protection circuit which knows what each cell voltage is.
As soon as anyone of them drops below the min limit it is turned off.

R/C planes draw enormous currents and that would be very hard to protect against.  In short they do not usually have any inbuilt protection. 

Last edited on Thu Jun 9th, 2016 09:29 am by Tony Walsham



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 Posted: Thu Jun 9th, 2016 09:57 am
   
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davecttr
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OK, I have the answer. I checked the hobbyking site and there is a solid state switch and battery protector for just over £5 It has a Lipo mode which cuts the power if the input voltage falls below 6V when used with unprotected 2S lipos.

It would look like this:

2S lipo > battery protector > voltage regulator > bluerail board



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 Posted: Mon Jun 13th, 2016 03:21 am
   
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dan3192
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I bought one of those Groove Cubes a while back to try out with a BlueRail board. I opted out on my reservation and decided to wait for the narrow boards coming out soon, so been using the BlueTooth speaker and my iPad with Bachmann app, and I like it.

Horn sounds are good, bell sounds could be much better. Brake squeal, brake release, radiator fans very nice. Here's my BPRC GP35 hauling that giant 87" tall speaker.

https://www.youtube.com/watch?v=AJEuxHQ4t-A

Dan

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 Posted: Mon Jun 13th, 2016 08:44 am
   
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davecttr
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Impressive! nuclear powered Bluetooth sound. That is a nuclear fuel flask you have on the wagon?

The sounds are not to loud either, just as I like it.

I agree they do need a much smaller board. the existing one would not fit in any of my locos.



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 Posted: Mon Jun 13th, 2016 09:56 am
   
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Bob D
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davecttr wrote: Impressive! nuclear powered Bluetooth sound. That is a nuclear fuel flask you have on the wagon?

The sounds are not to loud either, just as I like it.

I agree they do need a much smaller board. the existing one would not fit in any of my locos.

LOL!  I keep forgetting people work in scales other than the one I'm in (O).  Here I am asking BlueRail to make a board with more amperage (undoubtedly bigger footprint).

May we all get what we desire :old dude:

I did notice on my Ipad there's a symbol that, when the bluetooth speaker is on, shows on the Ipad screen to let you know the discharge condition of the speaker.

BobD.



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