I hear and I forget. I see and I remember. I do and I understand.
Attribute to Confucius (~500 BC).  Still true 2500 years later.

When I was 7 or 8 years old on a miserable cold gray day in February my parents dropped my brother and sisters off  at the Center of Science and Industry (COSI) in Columbus. http://cosi.org  What a wonderful place!  Our  favorite of all exhibits was the interactive bike generator. Hop on and pedal. Flip on the switches and power your own lights. See how many watts you could make and for how long.  All day long we kept coming back to try it again and again.  We got it.   Work, power, energy, electricity, volts, amps, watts, watt hours, renewable energy, conservation, limitations of the human body it is all included.  Dead simple and yet brilliant.

For science teachers, PE teachers this should be a  simple to build fun educational demonstration that could fit well into many different standards of learning objectives.  This should also be great for anyone who wants to make a fun interactive exhibit or a science project. 

To keep this simple start with an electric (assist) rear wheel direct drive hubmotor bike.  This is a popular version of Chinese electric conversion kits.  (Crystalyte, 9 Continent, Golden Motor (full size not mini)) (Pictured is the Crystalyte Roadrunner - 408 http://www.electricrider.com/crystalyte/).  

For this conversion -
1)Place bike on stand (a simple stand for an Xtracycle  - see my previous instructable https://www.instructables.com/id/Xtracycle-Stationary-Bike-Stand-for-Less/
2)Remove and Replace battery with Load (light bulbs and switches) (see following steps)
3)Pedal to generate electricity

Starting with another (not a rear wheel direct drive hubmotor electric bike) is likely doable but more complex. I will leave that as an exercise for the reader.  The popular Bionx direct drive may work but as the Bionx motor contains a proprietary internal brushless controller it may (or may not) be more challenging to convert in this way.

Step 1:

Parts needed:
1)Electric assist direct drive hub motor brushles bike
      a)Rear direct drive drive brushles hub motor direct drive hub motor brushles is (comes with the electric bike)
       b) DC brushless controller - black box / white label  pictured above (Crystalyte and Infineon work well comes with the electric bike)
        An electric bike kit can be purchased  kits at http://www.electricrider.com/crystalyte/ or http://ebikes.ca/store/store_motors.php    or http://goldenmotor.com/ (model Model: HBS36R -- Rear Hub Motor)

2)Load (light bulbs and switches) white box pictured above - See following steps for assembly

         a)24 volt 75 watt halogen light bulbs quantity 8  each $1.23  http://www.1000bulbs.com/search/?q=Q-JC5524++Hikari+
         b) Wire Connector Socket for MR16, MR11 or G4 quantity 8 ($13.49 for pack of 50)

           c)Electrical outlet box 4 gang – quantity 1 – Home Depot / Loews ($4.45)
           d)Household switches quantity 4 – Home Depot / Loews (contractor pack of 10 -$3.89)
           e)Miscellaneous – wire, connectors, ~4” scrap angle, epoxy

3) Bike Stand - For Xtracycle https://www.instructables.com/id/Xtracycle-Stationary-Bike-Stand-for-Less/
                           for traditional frame bike remove damper from a trainer such as  http://www.nashbar.com/bikes/Product_10053_10052_120205_-1___202608
4) Optional - Power Analyzer II - small blue box pictured above  (no longer sold by Medusa)  (measures watts/volts/amps/watt hours) This can also be done with a voltmeter  and ampmeter (2 multimeters but is not nearly as simple)
anybody remember "soya green "?
Love the quote and the story - puts the entire endeavor in context. Also think anytime you can make learning an experience you have made your teaching much more effective. Way to go Pat!
That looks like a lot of fun. And I really dig that Confucius quote.
I love this - combining PE and science works perfectly in this case. :D

About This Instructable




Bio: Fat, old, and nearly bald, Pat O'Briant bumbled his way through an aeronautical engineering degree at an enormous state university which fortunately had an ... More »
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