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Pedal-powered TV

(10 posts)
  • Started 3 years ago by neddie
  • Latest reply from steveo
  • This topic is not resolved

  1. neddie
    Member

    Sounds like I need to make a specification ;-)

    - Any member of the family must be able to power it -> turbo must fit any size of derailleur bike, incl. kids.
    - Doesn't matter if it doesn't "feel" like riding a real bike
    - Must power a small monitor (~20W), some PC speakers (~5W) and a RaspberryPi* (2.5W) or laptop (~20W), so maybe 50W would be enough (?)
    - Small battery backup to cover fluctuations, but no more than 10 mins without pedalling

    I think the problem is going to be finding a suitable dynamo, capable of 50W

    *I'm not sure if RaspberryPi e.g. RPi3 has enough graphics capability to stream video e.g. HD ???

    (New thread from http://citycyclingedinburgh.info/bbpress/topic.php?id=20194&page=84#post-346847)

    Posted 3 years ago #

  2. neddie
    Member

    Suggestion from @Muran Buch:

    https://www.instructables.com/No-TV-unless-you-exercise/

    Posted 3 years ago #

  3. neddie
    Member

    Thinking about it, it would be quite good if it could power the WiFi router as well, to cover the power-cut situation*. Seems there's been a few recently...

    *Although it's also quite nice not having any lecky during a power cut

    Posted 3 years ago #

  4. gembo
    Member

    Red live, yellow/green earth, blue to bits

    Do like the cheaper Heath Robinson aspect of this. Not generating the power just pedalling to stop the lights going out.

    Posted 3 years ago #

  5. acsimpson
    Member

    You could presumably borrow the sensors from an EPAC to make your EPAT.

    Posted 3 years ago #

  6. neddie
    Member

    Anyone know if an e-bike hub motor can be made to operate in reverse i.e. as a generator?

    Are these things electronically controlled, or are they more basic brushed motors with DC in, DC out?

    Posted 3 years ago #

  7. Frenchy
    Member

    There are quite a few videos on youtube by folk who have done similar things. Of the few I watched, this seemed to be the most useful in terms of "How would I actually do this myself?":

    [+] Embed the video | Video DownloadGet the Video Player

    Related, if not useful - cyclist makes toast:

    [+] Embed the video | Video DownloadGet the Video Player

    Posted 3 years ago #

  8. ARobComp
    Member

    Slightly different take on this which I enjoy - The Webcycle

    Faster you pedal the faster your internet goes. From 2009.

    http://www.naden.de/blog/bbvideo-bbpress-video-plugin -->

    [+] Embed the video | Webcycle" target="_blank">Video DownloadGet the Video Player

    Posted 3 years ago #

  9. neddie
    Member

    This could work as a generator / dynamo.

    Amazon - DC12V/24V 35W Mini DC Gear Motor

    Now the tricky bit is holding the bike steady, while at the same time connecting up the dynamo...

    Posted 3 years ago #

  10. steveo
    Member

    The gold standard for home brew wind generators used to be a dc treadmill motor. They're simple and don't require much electronics to manage the output.

    The switching motor in an ebike would output a nasty ac in reverse which would need a bit of electronics to produce a smooth dc to run any thing.

    If I were building this I'd look at a broken turbo, take the magnet off and run a pulley to motor. Connect the motor directly a big lead battery this will act as a big capacitor to smooth the power draw so you can efficiently pedal and use your gears to keep a nice cadence.

    Everything else can run directly off 12v with a little bit of work.

    Posted 3 years ago #

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