OMG!!!!! Did anyone else spot the number plate of the Rolls Royce that Chris Evans drove in the Top Gear episode last sunday? BRX522T!!!! This was clearly an attempt to brainwash the common folk to vote for the Brexit Campaign, even though it was shown three days after the vote! This plate was assigned to the car when it was first registered in Newcastle in 78/79, and Evans has owned it for a few years. This just goes to show how far back the conspiracy goes.
A non-story started by me, just now… shall we see how it goes?
As previously explained, I’m working on the use of an Arduino and an old laptop to control the points on my very small N Gauge model railway. Well, I’m also going to control the signals too.
Working on this track plan:
I consulted my tame signalling engineer (some say that he once completly ruined the brakes on my MG Montego, and that he spends his spare time writing cod-1950s hard-boiled detective story versions of his work, but all we know is that he’s called The Sig), explaining to him that all the lines were bi-directional. He put on his thinking-trilby, sharpened his crayons, and came up with this idea:
(Only the signals inside the box are to be modelled. The ones outside it are off-scene, and therefore just implied to be there and functioning.)
So, 6 signals. As I only had six remaining outputs left on the Arduino, I decided on 2-Aspect light signals.
Nominally they run off 12v but are plenty bright enough with 5v from an Arduino supplied to them. Plus, if you tie the Green line to 5v and the Black to GND, putting 5v up the Red line from the Arduino will switch the signal from green to red. This is counter-intuitive to me, as surely the signals should fail-to-Red, not fail-to-Green?
No, matter, it still make the wiring easier.
Eagle-eyes will spot the the lights are the wrong way up. Ah, well, it’s too late now.
Next… build up the control board for one pair of points, and one signal as a test.
I bought a Peperami this morning. I shouldn’t really, as the high salt and fat content will make me die. They are smaller now!
Or so it seems…
The weight of Peperamis haven’t changed for years. Indeed we are making them shorter and wider, because we are producing another brand (which is shorter and wider, but also 25g) as well and we would like to simplify our production process, but we definitely keep the usual 25 g net weight.
The problem with this 4 lane running smart motorway guff is that its fine until someone breaks down.
Normally with 3 lanes and a hard shoulder this isn’t too much of a hassle, but with 4 lanes it means that you suddenly lose a 1/4 of the capacity for a short distance causing an instant bottleneck. Sounds brilliant so far. An utter blinder of a plan.
Now imagine this scenario: Poor little old Mrs Thingy in her aged Micra breaks down and gets as far left as she can. The fat controller in the watch-box is busy scratching his knackers and doesn’t spot this hazard immediately. An over-hours HGV driver, distracted by an overdose of Redbull and barnyard pornography also fails to spot the hapless lady in time. Thus her small car is briefly turned into a a metal and flesh death-ball, punted down the carriageway at speeds it has previously never reached. Itchy balls + Redbull + beastiality = dead pensioner.
Can’t possibly happen, right?
Not seen the video of the truck belting down the motorway with a Clio stuck to its front bumper?
As stated elsewhere, I’ve mothballed the Arduino Dalek Project, and started to cannibalize bits for a new project: Arduino control of the turnout points on an N Gauge model railway layout.
For a start, heres some information about the point motors I’m using: The PECO PL-11 side mounted motors, which attach to the side of the points, like this:
These motors operate on 16v AC and require only (and indeed cannot tolerate more than) momentary current, and are currently controlled from “passing contact switches” drawing power from a Capacitor Discharge Unit.
There are currently 6 turnouts/points, arranged in pairs as below. As it would be reckless (and in real life impossible, due to interlocking) to operate either of the pair independently, I’ve decided to activate them together.
Thus, at all times both A and B will either both lead straight ahead, of both lead off to the left (for sets C&D and E&F it will be right not left).
As the Arduino can only throw out 5v DC, each pair of motors will need to be driven via a 5v DPDT replay. But, as we can’t leave the current on without melting the motors, each pair will actually need two relays (one for each direction of change), driven independently from different output pins. Another complication is that the relays will have to energised and then de-energised within a specific time-frame to avoid motor damage, but this is a programming issue to be dealt with later.
The above diagram shows only the 16vAC side of the wiring. The Arduino 5vDC is shown below.
Obviously I could have chosen to just use SPDT relays, and connect the outputs together, but due to the vagaries of how the motors work and the orientation and placement of them on the layout, I thought it was safer to design and wire it this way at the outset, rather than back-fix it later when it went wrong. Plus, I had all the wiring in place, so thought I might as well use it.
Note the lack of common Ground between the two halves of the circuit. Grounding AC and DC together isn’t a good idea. Just say no.
Anyway, here is all is again on one convenient image.
So now the next stage to to take that abstract squiggle and build it as a circuit.
Note – for myself, mainly: Each “pair” takes up 2 outputs, so for the three pairs of points we need 6 lines from the Arduino, out of a total of 12 (not 14, as I’d rather not use the 0 and 1 lines (RX & TX) as this could cause issues with data transfers activating the relays – something that the Dalek had problems with at first.
Here I go again, repurposing shit. In this case it is both a Doctor Who episode title and some electronic bits.
The Arduino Dalek/Raspberry Dalek project has been on hold for some time (obviously), due to me not being arsed to sort out a niggling wiring problem that only allowed one of the motors to run in one direction. That and the camera melting itself into slag. That didn’t help.
Anyway, today it suffered a major setback when the Arduino and relays got removed for use in another project.
But Daleks never say die, so it might come back later.
The gubbins are being reassigned to Project Railway, and will act as the point motor control system, once I’ve worked the circuit design out.
It seems a long time ago that I started working on an OO Gauge model railway. Well, true to form I abandoned that idea and moved on. Because of space problems, I switched to N Gauge, which takes up half the space.
I came up with the idea of “Garwick”, a station on a mainly industrial line which still handles passenger traffic. The layout is based mainly on the long-closed Maudlands station in Preston, but with several additions which “just seemed like good ideas at the time”.
The time period is somewhat confused, being set in a fictional era where British Rail never ended, and bus deregulation never happened. Hence old-style DMUs and Ribble buses sit alongside late model Transit vans, Austin taxis, modern cars and a BR Blue liveried Class 66.
Garwick is actually two stations. Firstly there is the main station which handles commuter traffic and has a taxi rank and bus stop.
This station was originally a two platform station, but one of the platforms was demolished to provide extra siding space for Shocks Mill. The underpass entrance on the platform now leads to a corridor and storage facilities.
The station sees frequent DMU trains which run to Pill End.
Since the closure of the second platform, the other through line has been mainly used for freight traffic to the nearby coal depot and bitumen processing plant.
There is also the secondary platform which is generally only used by the single car Class 121 service to the main town station . This was built on part of the former marshalling yard of Shocks Mill, which still stands above the site but has been converted in to a housing, and the former site of the original No 2 platform.
To the west, after Farish Lane bridge, the lines split. A single track line runs on to Pill End, and a line runs to the industrial sites at Chain Lane and Caul Road.
To the East, one line runs through the short Victoria tunnel to the City Centre, passing the DMU maintenance depot, while the the main line runs though the double track Albert tunnel to the south to join the main line. Locally, the Albert and Victoria tunnels have been nicknamed “George and Mildred”.
Obviously there is still a lot for work to do. The who track formation needs re-ballasting, the buildings need tidying up, and a lot of dead space needs to be filled. And that’s even before I start trying to hide the various point motors that are highly visible.
Before making the call, you need to prepare yourself for the questions you are going to be asked. It is vitally important that you know the following pieces of information:
Where are you? – Either the address or name of where you are.
Where are you going? – If you don’t know, we can’t take you there.
How many people? – This is really important, as you can’t fit 17 people into a Ford focus.
What is your name? – If you have to ask someone, it is probably time to go home.
Making the call
Once you have all the information required, there is one last thing to check before you make the call. Can you be heard?
It is all well and good knowing that 7 people want to go from the Brown Trumpet to the Pink Oboe in the name of Lucas, but if you can’t convey this information over the phone then you are screwed.
Good places to call from are:
Pub toilets or porches, beer gardens, anywhere that you can hold a conversation without shouting.
Bad places are:
At the bar on a busy night, 27cm from the main speaker stack at Knebworth when Motorhead are on, Cannock, a train, within earshot of your pissed mate murdering some piss-awful song on karaoke, next to a 747 spooling up for take off, a building site.
Don’t be surly. Really, we’re just trying to do a job. We’re trying to get as many people moved, and thus take as much money as possible. Getting arsey with us really won’t help.