morse code reader with paper tape

Discussion in 'The Projects Forum' started by uncle yardo, Dec 30, 2014.

  1. uncle yardo

    Thread Starter New Member

    Dec 30, 2014
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    I like the mfj Morse reader with key input. Problem is it is expensive and doesn't do what I want. I would like to have a 1x40 LCD screen and a built in 9 pin dot matrix printer. I have no idea what to head to select but the point is being as small as possible. It shouldn't be too hard to build a device to slice rolled paper into 1 line strips.

    I want a project to play with so I already understand that even the best cw decoders miss a lot. Noise and weak signals and so forth. The problems I perceive is dot matrix heads are loud. But the tape can be for archival and messages can be stored in memory to be printed at the end of transmission. So I have some knowledge of the parallax propeller microcontroller, but none dealing with motors. Basically the roughly 1" wide paper would advance horizontally across the print head. So I'm imagining a p-touch type label maker setup. A rubber friction pad on a pin roller would advance the paper.

    So any ideas or a schematic for a 9 pin dot matrix head.
     
  2. MaxHeadRoom

    Expert

    Jul 18, 2013
    10,553
    2,375
    If I understand right you are attempting to make a paper tape punch?
    Due to the lack of usage now I would have thought there are more than a few around lying surplus?
    Or is this an equivalent in print format?
    Max.
     
  3. MrChips

    Moderator

    Oct 2, 2009
    12,447
    3,363
    Sounds like a decent MCU project for a ham:

    Receive morse signal and display text on a LCD screen.
    Add-on option: print text on a thermal printer.
     
  4. uncle yardo

    Thread Starter New Member

    Dec 30, 2014
    4
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    printed. Not punched. But thermal seems like it might be quieter and easier to implement. Also that's a good idea about punch. I might be able to get away without an ink ribbon even. I would have to play with paper weights. I'm thinking thicker paper would hold the punch better if I wasn't to use ink. The hard part is the 9 pin print head interface.
     
  5. MrChips

    Moderator

    Oct 2, 2009
    12,447
    3,363
    Once I had to build some data loggers with paper tape output. We bought a bunch of TI-5015 thermal printing calculators and interfaced to the printer directly.

    [​IMG]
     
  6. uncle yardo

    Thread Starter New Member

    Dec 30, 2014
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    0
    these could work. There used to be a gameboy printer people were using. Super rare now, but rather than advancing the paper that I have to make myself I may choose to have tape come out the top like this. Also will allow me to make the unit small enough
     
  7. uncle yardo

    Thread Starter New Member

    Dec 30, 2014
    4
    0
    what i want to get away from is making a capstan. Unless i rubberize the shaft of the advance motor directly i would need to make a capstan to act as a drive belt to turn a friction roller. Motor shadt would be fine but extend the height of the project box.
     
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