Search found 32 matches

by metalmuncher
Tue Aug 27, 2019 5:29 pm
Forum: Projects
Topic: Another rc system for the PLR
Replies: 17
Views: 770

Re: Another rc system for the PLR

Rik Where do you get the boxes, on off switches and 10k variable resistors with detents in them? Struggling to find anything suitable from the UK :oops: RS Components is my go-to company for electrical components. They have free next day delivery with no minimum order quantity AFAIK. Farnell is my ...
by metalmuncher
Tue Jul 02, 2019 6:41 pm
Forum: Locomotives - Electric
Topic: Initial experiments with Bluetooth and Arduino
Replies: 38
Views: 1501

Re: Initial experiments with Bluetooth and Arduino

With regards to the lack of tactility, it looks like it should be pretty straightforward (for anyone with the prerequisite knowledge) to make a transmitter like the common knob-and-reverse-switch type that works over the bluetooth link. I have been playing with alternatives to the usual Deltang type...
by metalmuncher
Sun Jun 30, 2019 2:02 pm
Forum: Scenery
Topic: Station Area Scenery
Replies: 12
Views: 969

Re: Station Area Scenery

Managed to get the tower pretty much completed this weekend, mainly just painting and assembly, but also made up an external rising main: 2-1 pipe_resized.jpg It's built up from a bit of brass pipe with the details 3d printed, the brackets and valve are just slipped over the end of the pipe and glue...
by metalmuncher
Sat Jun 22, 2019 11:30 am
Forum: Scenery
Topic: Station Area Scenery
Replies: 12
Views: 969

Station Area Scenery

We've had a baseboard with a station track layout outside for a couple of years now, but it is in a bit of a sorry state: 1-1 track_resized.jpg I've finally decided to get on with scenery to smarten up that part of the layout. I'm hoping to chronicle the development of that area in this thread. Afte...
by metalmuncher
Thu May 09, 2019 6:43 pm
Forum: Projects
Topic: Small details ideas?
Replies: 17
Views: 1011

Re: Small details ideas?

though incorporating a switch might prove to be a challenge. One simple way to create a switch for a button cell is to put the cell in a metal tube. Tighten a threaded end cap on the tube so the cell is pushed up against a central contact at the other end, and the metal case acts as the other conta...
by metalmuncher
Sat Jan 12, 2019 10:49 pm
Forum: Help & Advice
Topic: Deltang advice
Replies: 18
Views: 1336

Re: Deltang advice

I think Rik's 'option 3' should work if you put the LEDs across P1 and P2 instead of the buffered drives. From the looks of it pads P1 and P2 are directly connected to the IO pins of the microcontroller: https://i.imgur.com/N9uYSy8.jpg The datasheet for the MCU says IO pins should be able to sink or...
by metalmuncher
Sun May 27, 2018 2:04 pm
Forum: Help & Advice
Topic: Picaxe servo control
Replies: 43
Views: 3344

Re: Picaxe servo control

The Picaxe manual recommends using a 330 ohm resistor on the control output pin to a servo. Ie in series. I don't know why. Thanks Greg. Yes, I heard that as well. Whilst searching for an answer to my problem yesterday, I came across numerous references to it on R/C and Robotics forums, and nobody ...
by metalmuncher
Fri May 25, 2018 8:36 pm
Forum: Help & Advice
Topic: Picaxe servo control
Replies: 43
Views: 3344

Re: Picaxe servo control

As far as I know, you need to send a 1 to 2 ms pulse every 20ms. The length of the 1-2ms pulse dictates the desired servo position. If you send a 1.5ms pulse every 20ms, the servo will attempt to position itself at mid travel fast as possible, rejecting any disturbances it can overcome. Not quite s...
by metalmuncher
Fri May 25, 2018 5:56 pm
Forum: Help & Advice
Topic: Picaxe servo control
Replies: 43
Views: 3344

Re: Picaxe servo control

The 'pulsout' command sends a pulse of either 100 or 200 ms to the servo to turn it left or right ( nominal mid point is 150). The servo takes 120ms to do a 60deg sweep, so will need several pulses to do the full left to right, hence it goes round the loop several times and the counter keeps track....
by metalmuncher
Mon May 14, 2018 7:55 pm
Forum: Videos
Topic: More HGLW Wittenberg-Schafer!
Replies: 19
Views: 1850

Re: More HGLW Wittenberg-Schafer!

I've thought for a while now that the different sounds in each direction was something to do with the end play in the motor - in one direction the rotor always falls due to gravity and the worm drive pulls down as well, in the other direction the worm drive pushes the rotor up, the spur rotates and ...
by metalmuncher
Tue May 08, 2018 2:31 pm
Forum: Help & Advice
Topic: Turnout control by servo - my experiences
Replies: 25
Views: 1719

Re: Turnout control by servo - my experiences

I've had a bit of a play with using an Arduino to make a servo bounce. https://youtu.be/nHfDRS-fsZg The code is just hacked together to make something that works - could do with many improvements. Floating point makes it slower than it needs to be, and as written the code only works in one direction...
by metalmuncher
Fri Mar 09, 2018 7:50 pm
Forum: Projects
Topic: A Home Wi-Fi Connected Garden Railway
Replies: 30
Views: 3845

Re: A Home Wi-Fi Connected Garden Railway

Very interesting, thanks for sharing. That MQTT protocol is super easy to set up, got a Raspberry Pi and my machine talking to each other in a few minutes. Just ordered an ESP module now for further experimentation. The messages seem to be just strings - I guess you have your own format that packs t...
by metalmuncher
Wed Mar 07, 2018 6:57 pm
Forum: Help & Advice
Topic: Overhead belt pulley wheels
Replies: 24
Views: 3271

Re: Overhead belt pulley wheels

Mostly as an exercise in learning CAD, I've drawn up a parametric pulley in Autodesk Fusion 360. The model is only for half a pulley, you would need two 3d prints to make a complete pulley, but this way avoids overhangs. It does have a crown and draft angles so I guess in theory it could be used as ...
by metalmuncher
Tue Mar 06, 2018 11:31 pm
Forum: Help & Advice
Topic: Overhead belt pulley wheels
Replies: 24
Views: 3271

Re: Overhead belt pulley wheels

That would probably be my approach but then I have the lasers... A 3D printer is another tool that comes in handy for low quantities of customised detail parts like this, but has the same problem of machine availability as a laser cutter... You could use the prints for lost plastic casting into alu...
by metalmuncher
Sat Mar 03, 2018 11:19 am
Forum: Locomotives - Electric
Topic: Dunitrong Locomotive Works
Replies: 41
Views: 11100

Re: Dunitrong Locomotive Works

Would you consider making more of them. :thumb right: If you're looking to get hold of the parts for this to make one for yourself, you could look at 3Dhubs: https://www.3dhubs.com/3d-printing They are essentially a go between for people who want things printed and people who have printers. Hopeful...