Search found 212 matches

by Gordon H
Wed Nov 07, 2018 12:58 pm
Forum: Electronics
Topic: Aruino RS485 point control
Replies: 3
Views: 856

Re: Aruino RS485 point control

Not specifically for servos, and certainly not using Arduinos, but RS485 has been used in model railways for many years. Lenz XBus (now Expressnet) is an obvious example. One of the main considerations for point operation will be the number of RS485 receivers you can connect together in the network....
by Gordon H
Fri Oct 12, 2018 2:03 pm
Forum: Electronics
Topic: Looking at electronic componants
Replies: 23
Views: 2312

Re: Looking at electronic componants

In the London area there is Cricklewood Electronics.
https://www.cricklewoodelectronics.com/
by Gordon H
Wed May 30, 2018 12:34 pm
Forum: General Model Railway Discussion / News
Topic: Cable
Replies: 7
Views: 686

Re: Cable

b308 wrote:Just make sure you use multi core wire, not single core. Single core can easily break and is a sod to repair, it's just not worth the hassle when the other stuff is about the same price (or free).

You mean multistrand, not multicore - which has a different meaning entirely.
by Gordon H
Tue May 08, 2018 12:44 pm
Forum: Electronics
Topic: ARDUINO PROGRAMMING, AND INTERFACING HELP
Replies: 98
Views: 10270

Re: ARDUINO PROGRAMMING, AND INTERFACING HELP

Not being very good at compiling an Arduino sketch, I spent ages to try and find a sketch on-line, even the Arduino site itself. I only wanted to operate two crossing gates via two press buttons. i.e open, closed. Never found any solution or simple help, just experts keeping the ''secrets'' to them...
by Gordon H
Sat Feb 24, 2018 7:30 pm
Forum: Electronics
Topic: Wire size.
Replies: 10
Views: 1878

Re: Wire size.

In the US, the recommended colours for your DCC bus are red and black. Why? Because these are the colours used for mains wiring there... Don't think so. Black is live, and white (or grey) is neutral on single phase installations, which are what most people would encounter. Red is only used as the s...
by Gordon H
Fri Feb 23, 2018 3:30 pm
Forum: Electronics
Topic: Wire size.
Replies: 10
Views: 1878

Re: Wire size.

Wire current ratings are not just about the absolute maximum current a wire will conduct before melting. Generally, the quoted rating for a conductor is the current which will produce a temperature rise in that conductor which is in the acceptable range of the insulation material it is coated with. ...
by Gordon H
Mon Dec 18, 2017 12:57 pm
Forum: Electronics
Topic: What to do with 24v LEDs with mounts. Have some free.
Replies: 5
Views: 702

Re: What to do with 24v LEDs with mounts. Have some free.

The one shown in the picture is from RS, part no. 491-3691 8mm mounting, prominent 5mm indicator. Note though, that these are classed as ' LED Indicators' rather than just 'LEDs', to distinguish them from bare LEDs which don't have current limiting and reverse protection included. Given the way they...
by Gordon H
Tue Dec 12, 2017 12:23 pm
Forum: Electronics
Topic: Drop 5v down to 4.5v
Replies: 5
Views: 860

Re: Drop 5v down to 4.5v

Wouldn't making up say, a rig of resisitors from the output drop it down to 4.5v? Or perhaps some LED's inline. Unfortunately, neither of these methods would work very well. The voltage a set of resistors drop will vary considerably with the current drawn. You would have to decide at what current y...
by Gordon H
Tue Nov 14, 2017 12:27 pm
Forum: Electronics
Topic: LED current consumption
Replies: 7
Views: 903

Re: LED current consumption

I have a number of 1amp 12v power supplies suitable for wiring up. I don't want to overload them so would like to know approximately how many LED's I can connect. They will all be set up for 12v operation with the necessary resistors already attached, as I am avoiding 3v. What is the wattage of a s...
by Gordon H
Wed Aug 16, 2017 8:36 pm
Forum: Electronics
Topic: How does a rollerball mouse really work.
Replies: 4
Views: 687

Re: How does a rollerball mouse really work.

This is basically a super simple encoder, known as a "rate" encoder ... The technique is also known as 'Quadrature Encoding' because the two sensors are set effectively 90 degrees apart in phase relative to a slit (not position around the wheel). One sensor is used as a reference 'clock',...
by Gordon H
Wed Aug 16, 2017 8:23 pm
Forum: DCC Forum
Topic: Servo operated with DCC decoder
Replies: 13
Views: 1607

Re: Servo operated with DCC decoder

I used 'memory wire' for the sliding doors on my Class 508 EMU. No moving parts (other than the items to be moved) and all you do is pass a current through the wire to control it.
by Gordon H
Mon Aug 07, 2017 8:06 pm
Forum: General Model Railway Discussion / News
Topic: Video Camera Locos
Replies: 13
Views: 1703

Re: Video Camera Locos

Funny you should say that, a friend works for R&D at JLR and was telling me about a true 180 degree vision capability turning the door and windscreen pillars into screens with external cameras so nobody is ever hidden in a blind spot. I was involved in a similar scheme a few years ago on a mili...
by Gordon H
Tue Aug 01, 2017 3:46 am
Forum: DCC Forum
Topic: Servo operated with DCC decoder
Replies: 13
Views: 1607

Re: Servo operated with DCC decoder

If you want to control the actual position of the servo in a variable manner, then you will need a decoder such as that described already. However, if your requirement is to simply move the servo between two set positions, you could use a conventional decoder with function on/off outputs and a separ...
by Gordon H
Thu Jul 06, 2017 12:59 pm
Forum: DCC Forum
Topic: DCC Point Controller?
Replies: 29
Views: 2935

Re: DCC Point Controller?

I've had an in-depth look at Merg which would be ideal. What has completely turned me off to it is just about the worst data collection policy in the T&C I've EVER seen. They send out your PERSONAL DETAILS to other members in the form of a membership list!!! I don't believe this conforms to the...
by Gordon H
Mon Jul 03, 2017 6:34 pm
Forum: DCC Forum
Topic: DCC Point Controller?
Replies: 29
Views: 2935

Re: DCC Point Controller?

Thanks for that. I think the best thing to do is go along to an area group meeting and ask sensible/annoying questions and maybe see some of it in action. Warley is a bit too far away to see them there. If you have a look here, you can see when the next area group meetings and MERG attended shows a...

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