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Getunderit

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About Getunderit

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  1. Getunderit

    Working Lift Bridge Diorama

    Without going to far off the topic...
  2. Getunderit

    Working Lift Bridge Diorama

    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?
  3. Getunderit

    Working Lift Bridge Diorama

    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. Starting operations manual from scratch. 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.
  4. Getunderit

    Working Lift Bridge Diorama

    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.
  5. Getunderit

    Working Lift Bridge Diorama

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

    The Bridge on the River Kwai

    Related true story movie: https://en.wikipedia.org/wiki/To_End_All_Wars
  7. Getunderit

    Working Lift Bridge Diorama

    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.
  8. Getunderit

    Working Lift Bridge Diorama

    Above post was the construction of the circuit shown in link below.
  9. Getunderit

    Working Lift Bridge Diorama

    Thanks fellows. You are all swell guys. ___________________________________
  10. Getunderit

    Working Lift Bridge Diorama

    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.
  11. Getunderit

    Working Lift Bridge Diorama

    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. 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.
  12. Getunderit

    Working Lift Bridge Diorama

    @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.
  13. Getunderit

    Working Lift Bridge Diorama

    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.
  14. Getunderit

    Working Lift Bridge Diorama

    BOAT NAV LIGHTS CHANGEOVER TRIGGER Had difficulty figuring how to switch the boats navigational lights from downstream to upstream travel. Mechanical switching proved troublesome to arranged when boat reverses direction. Decided to use an "old party trick" using a light beam to trigger a change in nav lights. The idea is that the LED light beam is ON whenever the pulley motor is in clockwise (CW) rotation (boat to travel upstream). This light is fixed at on one end of the tracks. On the boat vane is the light beam sensor, known as a Light Dependent Resistor (LDR). While the vane moves back and forth, the LDR is always facing the LED light source. When the light is OFF, the LDR resistance becomes high (135,000 ohms). This keeps a transistor in OFF mode. When the pulley motor is switched to CW operation, the LED light turns ON, and shines on the LDR. Its resistance instantly drops to 62,000 ohms. This low resistance allows a transistor to be in ON mode, tripping a relay. The relay switches the boats nav lights over from downstream to upstream configuration. Here, I am experimenting with the LDR.
  15. Getunderit

    Working Lift Bridge Diorama

    Thanks fellows for your 'likes' _________________
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