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Working Lift Bridge Diorama


Getunderit

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A favourite LED holder is a pen tube. However, this pen had a strange bore shape. Not only was it square, it was also way off centre. But I quickly put it to my advantage. Upon rotating the tube, one can shift both LED and LDR longitudinal axis to align better, to each other, over a long distance.

 

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@Timmas, sorry that I may have confused you in these last posts. Believe me, it's confusing for me too. However, at one step at a time (post by post) I am starting to get a clearer view of what I have been trying to build.

 

Aging has its downfalls. No longer able to hold too many ideas at once. This particular section of the build has many parts that must fit together without restricting any of the other parts. So. it's a bit of a visual nightmare to grasp. Fingers-crossed, I have come near its completion without foreseeable problems. Only have to design the electronic circuit, and circuit board, to fit (somewhere) on the boat vane. Oh, and design and build a 9V battery charger, which goes in a box under the display table.😵🤪:rage:

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Had some head banging today. Had a boat vane problem. The battery holder got in the way of docking at the other side of the track. Had to relocate the battery holder, optical switch, and the limit microswitch, by a total of 11 mm. That is a lot!!! Had to move the battery holder 6 mm, and the optical switch 5 mm, to left.

 

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Designed the simple light detector circuit. The relay is dormant while light beam is OFF, allowing downstream nav lights to be ON, represented by the red LED. Once the light beam is ON, the relay becomes active, changing over nav lights for upstream, represented by the green LED.

 

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On 10/30/2018 at 9:22 AM, Getunderit said:

@Timmas, sorry that I may have confused you in these last posts.

There's no need to apologise!

 

If I had a mechanical brain, or an electrical one, I would understand what you're doing, but as I have neither I don't have a clue. :confused: What I do know is, and from what I've seen so far, this will work out beautifully. I can't wait to see it finished and am only sad that I will almost certainly never see it 'in the flesh' so to speak, so I'll never see it functioning. :sad:

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4 hours ago, Timmas said:

There's no need to apologise!

 

If I had a mechanical brain, or an electrical one, I would understand what you're doing, but as I have neither I don't have a clue. :confused: What I do know is, and from what I've seen so far, this will work out beautifully. I can't wait to see it finished and am only sad that I will almost certainly never see it 'in the flesh' so to speak, so I'll never see it functioning. :sad:

I know it is not the same as seeing it for real, but I am sure the museum will make a video, for YouTube, when its all finished. If so, I'll post that here, on this thread. Most likely early next year.

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46 minutes ago, Getunderit said:

I know it is not the same as seeing it for real, but I am sure the museum will make a video, for YouTube, when its all finished. If so, I'll post that here, on this thread. Most likely early next year.

That will be brilliant. I'll keep my fingers crossed ...:daydream:

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Created a similar circuit for the optical switch which switches boat pulley motor OFF when it reaches end of travel. Top right image shows boat vane about to enter sensing gap of optical switch _ green LED indicates motor is ON. As soon as vane passes midway of optical switch, relay is tripped _ red LED indicates motor is OFF. Will create circuit board for two circuits, one for each end of transport track.

 

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3 minutes ago, Svedberg said:

I think I see some kind of variable resistor or potentiometer in both of your circuits. Is that for setting the light sensitivity depending on actual light conditions? Or do they have some other purpose?

That is correct. It is going to be darker under the display table, where these circuits will be operating.

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6 hours ago, Svedberg said:

Seems as you have done things like this before, knowing what to expect

Yes and no.

Yes, I have built such a circuit before.

No, it is not because I built it before. But more importantly because it's knowing what/how the components operate/do. All components have a datasheet, with graphs showing their range of operating tolerances.

Here, a photo-transistor, triggered by light intensity, is being used. It has a huge value variation from brightness to darkness in operation. So, it becomes prudent to have this circuit adjustable to suit its operating range and purpose.

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HEADACHE DAY today. Came to a full stop with controlling the boat motor. Could not remember what my operating plans were for it. Discovered many unresolved issues with the design. Decided to start from scratch, in regards to operating the console. There are about 14 steps to complete. Got stuck in step 3 already. It turns out that there is a need for major re-design.

 

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Starting operations manual from scratch.


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As you can see, much of the original plan needs to be altered, and this is just for selecting up and downstream travel. Strange how one can become blind to things when focusing on it for too long.

 

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Now that would be a challenge, Timmas.

I can see that it would require two separate models, each obscure, yet can only be seen from one point in space, for the two to merge into one impossible perspective. Ideal for a peep show.

Are you going to build this?

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