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Type: Posts; User: Gary Rowan

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    Hadn't considered I2C, but with those 2 chips, it...

    Hadn't considered I2C, but with those 2 chips, it certainly could be a solution.

    Here are the advantages / disadvantages that I can see:

    Advantage: Lower chip count with I2C. I would...
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    Interesting idea. Using charlieplexing, 3 pins...

    Interesting idea. Using charlieplexing, 3 pins can handle up to 6 LEDs, or two 3-color signal heads. That would basically cut the needed pin count for the signal LEDs in half.

    Several...
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    I am leaning toward the three-block, four-aspect...

    I am leaning toward the three-block, four-aspect signaling (G-FY-Y-R). And yes, I realize that this really only requires the next 2 block occupied signals.

    I'm also toying with the idea of...
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    This whole crazy thing started out with the idea...

    This whole crazy thing started out with the idea of using the Arduino as a block signal controller.

    I figured I would need the following:

    2 signals with 3 LEDs each = 6 pins
    Block occupancy...
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    The data pins on the Arduino can be switched...

    The data pins on the Arduino can be switched between input and output at will. The programming will set the pins to output mode when writing to the bus and input mode when reading from the bus.

    ...
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    Okay, I got adventurous and downloaded EasyEDA...

    Okay, I got adventurous and downloaded EasyEDA PCB design software, started piecing together a schematic, and came up with a small NANO based motherboard. As it stands, I've still have 6 usable...
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    @Allen H Thanks in advance for your time and...

    @Allen H

    Thanks in advance for your time and energy.

    GDR
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    It just so happens that the chips I have in my...

    It just so happens that the chips I have in my parts box are LS-TTL. So... 16 * 0.4ma = 6.4ma which is less than the ATmega recommended 20ma.

    So maybe a pull-down resistor on each data line to...
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    Arduino Nano thought experiment

    Maybe some of the electronics gurus here can educate me a little.

    As a thought experiment:

    I have an Arduino Nano with its limited number of pins. I have have no problem hooking up various...
  10. I would have to say that my defining moment was...

    I would have to say that my defining moment was when I left college to go to work full-time. Before college, I had an old worn out Lionel set, and my lawn mowing money was spent on HO. Had a 4x8 HO...
  11. If I recall correctly, I used some axles and...

    If I recall correctly, I used some axles and pickups from a dead steam loco tender and swapped them into the caboose.
  12. @Paul Schmidt...

    @Paul Schmidt,

    I would build the circuit as shown in the circuitbasics.com link, substituting the sensor for the push-button switch. My preference would be to use an electrolytic cap instead of a...
  13. I believe that once triggered, the 555 would stay...

    I believe that once triggered, the 555 would stay on for the duration of the timing interval, eliminating any 'bounce' from the sensor.

    Here's a couple of links for reference:
    ...
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    Photoresistors have often been used in block...

    Photoresistors have often been used in block detector circuits. The one in the photo have had to been connected to additional circuitry to be useful.

    The principal is fairly simple. When light...
  15. Have not built one but I'd probably try something...

    Have not built one but I'd probably try something like this: https://www.adafruit.com/product/1766 coupled with a 555 timer circuit wired to generate a single long pulse when triggered.

    -or-

    If...
  16. How would you? -or- would you? (Salvaged Materials)

    I have this nifty heat sink salvaged from a dead computer and I'm thinking it might make for an interesting structure.

    It's shown next to a locomotive for scale reference.

    How would you use...
  17. Arduinos, relays, and rotary switches are all...

    Arduinos, relays, and rotary switches are all good if you the ultimate in flexibility.

    Based on the legend in the lower left corner of the layout diagram, there's a much simpler solution.

    1. ...
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    Something I didn't see mentioned above... As...

    Something I didn't see mentioned above...

    As long as one wheel of an wheel-axle-wheel set is insulated, everything should be okay, provided that all the axles on the same truck have the insulated...
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    Bingo, that is a major reason. Another is...

    Bingo, that is a major reason.

    Another is that the older I get, the harder it is to get the things apart and back together.

    Third, while these motors work, I'd like to replace them with...
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    Re-motoring old bachmann locomotives

    I'm looking to re-motor a couple of old Bachman diesel locomotives. They're both pretty close to 30 years old. Both have lots of run hours and the bushings are starting to squeal.

    Any...
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    I recently used Createx to paint a fleet of ore...

    I recently used Createx to paint a fleet of ore cars and was pleased with the results. It seemed to flow well and cover nicely. It was initially a little too thick for my preference, so I did thin...
  22. Budget Modeling - How to use pecan shells ?

    I've just finished shelling some pecans and have a gallon bag full of shells.

    Looking for ideas on how / where to use these on a layout.
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    I've found that hydrogen peroxide while take...

    I've found that hydrogen peroxide while take sharpie off floor tiles with a paper towel and a little rubbing.
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    @migalyto...

    @migalyto mentioned using molds. Have you considered making your own using something like http://www.hobbylobby.com/Crafts-Hobbies/Clay-Molding-Sculpting/Casting/Mold-Builder-Liquid-Latex/p/20660.
    ...
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    Check out your local artsy-craftsy store for...

    Check out your local artsy-craftsy store for paints for painting glass.

    Something like...
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