Lumsdonia R&D Dept Workbench

Have any questions or tips and advice on how to build those bits that don't come ready made.
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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Fri Dec 29, 2017 11:33 pm

mumbles wrote:Excellent.stuff. seems to be a little twist at the end though? Doesn't stop it being awesome but I guess you are trying to iron that out?

It's only a test rig, when all the joints are tightened and screwlocked, it should be nice n tight :D

So after a lot of tweaking and adjustments, I finally got the four point car lift to work smoothly.

Four point Car Lift

P1060736.JPG
Last edited by TimberSurf on Fri Mar 02, 2018 8:26 pm, edited 1 time in total.
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Mountain
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Re: Lumsdonia R&D Dept Workbench

Postby Mountain » Sat Dec 30, 2017 12:12 am

Excellent work there. Was a lot of effort to make a car lift work. Glad it gave decent results. :)
Enjoying 7mm narrow gauge.

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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Fri Mar 02, 2018 8:25 pm

Not much moved on the development front, I have done some experimentation with static grass. I have effectively made a static grass box utilising my greenescene applicator and using it to make tufts and flowers on cling film. At a recent show, I indulged myself with a decent airbrush, to which I will keep my gummy old Humbrol enamels away from it. Thus I need acrylics! So happened on a deal at antenocitis workshop of a £1 a bottle and got one of every colour! Bargain
Can't wait to play with my new toy, that brass on the car lifts can now have a fine colour scheme that does not interfere with the workings!
I will feel less reluctant to use airbrushing more often now that I have an easy clean tool and media. Next I need to experiment with cheap alternative (home made) Acrylic Airbrush thinner, Acrylic Retardant and Flow improver
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End2end
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Re: Lumsdonia R&D Dept Workbench

Postby End2end » Sat Mar 03, 2018 1:22 am

Brilliant. :D
Great smooth lifting action.
Thanks
End2end
"St Blazey's" - The progress and predicaments.
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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Sun Mar 04, 2018 5:30 pm

I am trying to make as much as possible on the layout work, as well as just the trains. So lighting is important to me.
You can buy these, as modern with a blue circled arrow and yellow patch for £3.95, but that works out as a lot if I have half a dozen!
It can't be that hard to make , can it?
I was thinking of casting in resin, but it just struck me that I have some square styrene tube, shove a 3mm LED up it, print a "Keep Left" logo, cap it and hey presto, 6 made in 3/4 of an hour! Plus more suited to the 60's era.
Keep Left 5.jpg
Keep Left 5.jpg (33.57 KiB) Viewed 574 times
Keep Left 1.jpg
Keep Left 1.jpg (17.01 KiB) Viewed 574 times
Keep Left 4.jpg
Keep Left 4.jpg (28.29 KiB) Viewed 574 times


Now back to the drawing board and casting to make lit petrol pumps!
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Lumsdonia <--- Hit link to go to my website for full story and wiring advice!

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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Sat Mar 10, 2018 8:55 pm

Well I bit the bullet and dug out my Arduino boards again!
Managed to get the USB to serial working and connect and program the Arduino.
Turns out that is the easy bit!
I started with a traffic lights program, didn't like any I could find on the web (too simplistic) for two way, did find a complex one for 4 way control, but I am not modelling a inner city!
So made my own program with no delays, using states. 28 phases with 8 states.
Cool, one down a dozen to go!
Next the servo's, tried many and got them working, but not happy, as they don't allow both servo's to move independently.
It seems I will have to get my head round millis or class modules to get multitasking!
I knew learning a new language would drive me nuts! :roll:
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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Fri Mar 16, 2018 10:14 pm

Well I cracked the multitasking, the other day and got both servo's to move independently and randomly. So while in the mode (I think the bug has bitten) I decided to have a go at a similar program, to drive two servo's and lights for a level crossing with barriers. That done, not sure what next. Might do one for a gated level crossing while I am at it. I have a PCB that does it, but it just drives all servo's at the same time. I could write a program that does a slight offset in the gate timing and add some bounce to the gates closing and an output to drive an mp3 player to give the "clatter"!
Sound good? (pun intended)
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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Fri Mar 16, 2018 10:19 pm

End2end wrote:Brilliant. :D
Great smooth lifting action.
Thanks
End2end


It's a con E2E, it was me twisting a potentiometer that gave the smooth movement! Now I have cracked the Arduino and some fancy programming, I can drive it automatically so both lifts are completely independant and go up and down after appropriate pauses (unattended)

If you can't wait to see it all in action, you will be in a queue behind me, but work is getting in the way!
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Lumsdonia <--- Hit link to go to my website for full story and wiring advice!

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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Sat Mar 24, 2018 9:59 pm

TimberSurf wrote: I could write a program that does a slight offset in the gate timing and add some bounce to the gates closing and an output to drive an mp3 player to give the "clatter"!
Sound good? (pun intended)

Done as above, fully functioning in the simulator!
Next to work out the mechanism and fit LED's to the indicator board
That reminds me, I need to buy some amber leds!
It might be a 6 (chinese) week wait for the video!
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Lumsdonia <--- Hit link to go to my website for full story and wiring advice!

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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Sun Apr 01, 2018 11:30 pm

Found a UK supplier at a good price so Amber LED's turned up 2 days later. I have a mishmash of bits of all sorts of level crossings, so have picked out the best bits for my purposes. A few holes and some grinding in the grey plastic and I have the servo's linked to the barriers. The LED's are fitted and wired down the brass pole. This plate will sit in a very large hole on the layout so will be easily maintainable. So I need to create a multipole connector, to join this to the arduino and the second plate for the other side.
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Level Crossing Barrier prelim.jpg
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Lumsdonia <--- Hit link to go to my website for full story and wiring advice!

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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Wed Apr 04, 2018 10:41 pm

Well the new batch of Arduino Nano's arrived today, so had a play at downloading the program and running things off it (actual hardware rather than just in a PC simulator). Mostly successful, it runs beautifully off a battery, but once on a power supply, things went pear shaped!
First issue was the the lights started flashing, as if it could not boot, discovered my power supply is not as smooth as I thought, so a big 4,700uF cap sorted that (I am sure a smaller one will do later). Now as the servo's and the Arduino run on 5v and my auxiliary bus (non DCC for lights/animation) will be 12V, I got some buck converters to reduce the voltage from 5V to 12V, for each arduino around the layout. The one I tried is fighting me, shows 5.5V when disconnected but drops to 2.6V when connected? Needs some investigation tomorrow (I'll try a second one)
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Lumsdonia <--- Hit link to go to my website for full story and wiring advice!

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TimberSurf
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Re: Lumsdonia R&D Dept Workbench

Postby TimberSurf » Fri Sep 14, 2018 9:53 pm

I discovered the problem with my voltage reducers, I had not wired up the negative!
There are four terminals, so I just assumed two in and two out! Turns out the fourth is an enable and both negatives go to one of the other three. :shock:

I made an interesting discovery tonight! :idea:

It seems you can solder steel together! :o (albeit coated in tin)

I have made some fencing from 12mm tall staples, by soldering them end to end, with surprising ease :P .
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Lumsdonia <--- Hit link to go to my website for full story and wiring advice!


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