How to Build Sequential Lamp Tree for Treadmill Motor Bicycle Generator Classroom Project

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#1 21678959 14 Feb 2018 21:39

Ryan Northup Ryan Northup

Anonymous

Post #1
21678959 14 Feb 2018 21:39

So, to start off I am not an electrical engineer, I am a master electrician that teaches at a career and technical high school. we are working on a project where we salvaged a motor from a Tread mill and have coupled it to a bicycle. I would like to be able to build a "Tree" of lamps in such a fashion that they would light up sequentially as more voltage is applied. (Like a carnival game the students can "race" to see who can light up the most).

I am looking for advice or guidance of what I would need to frugally accomplish such as this was not in my budget and I will be paying for this out of pocket.
Thank you in advance!

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#2 21678960 15 Feb 2018 14:52

David Ashton David Ashton

Anonymous

Post #2
21678960 15 Feb 2018 14:52

Ryan... can you advise... is your generator putting out DC or AC? I'm assuming DC? and what voltage?
To keep it simple, you can use a Zener diode with a resistor going to the base of a power transistor, with the collector driving a lamp. By making a few of these circuits with different voltages of Zener diode, you can get lights to come on at different voltages.It'd difficult for us to post diagrams here but if you advise more specifics I can suggest more detailed solutions.
#3 21678961 15 Feb 2018 19:36

Ryan Northup Ryan Northup

Anonymous

Post #3
21678961 15 Feb 2018 19:36

Yes it a DC motor, originally operated at 95 volts but I'm estimating it to produce in the vicinity of 18 volts with how fast they have been able to spin it. We are still constructing the frame and as soon as we put it together we can have an actual voltage output.
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#4 21678962 15 Feb 2018 20:15

Rick Curl Rick Curl

Anonymous

Post #4
21678962 15 Feb 2018 20:15

I think the trick to keeping it really simple would be to NOT try to power the lights from the generator. Put a load across the generator (so some actual work will be involved), then if it's an AC generator(alternator), add a rectifier, and feed the resulting output into an analog bar graph display. If you do an internet search you'll find tons of ways to build an analog bar graph display.
Another possibility would be rather than having multiple lights, find a big analog panel meter and use that as the display. Super easy! If you have trouble finding a big analog meter, try searching for a local Hamfest. Hamfests are get-togethers for Amateur Radio Operators, and they always have tons of odd parts for sale (also lots of free advice!)-Rick
#5 21678963 15 Feb 2018 22:31

Elizabeth Simon Elizabeth Simon

Anonymous

Post #5
21678963 15 Feb 2018 22:31

Rick and David have already given some good suggestions. The only thing that I would add is that you could also use a Voltmeter display (either digital or analog) You could use a resistor divider if necessary to scale the output.
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#6 21678964 22 Feb 2018 05:45

John Umolu John Umolu

Anonymous

Post #6
21678964 22 Feb 2018 05:45

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#7 21678965 23 Jun 2020 17:16

matt simons matt simons

Anonymous

Post #7
21678965 23 Jun 2020 17:16

We’ll discuss
this first. Students need to choose their friends wisely. If they don’t engage
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#8 21678966 03 Dec 2021 18:46

Beazy Beazy

Anonymous

Post #8
21678966 03 Dec 2021 18:46

Thanks for sharing Matt
#9 21678967 19 Jan 2022 12:07

Timothy Lyall Timothy Lyall

Anonymous

Post #9
21678967 19 Jan 2022 12:07

thanks
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Topic summary

A career and technical high school project involves salvaging a treadmill DC motor, originally rated at 95 volts but currently producing approximately 18 volts, coupled to a bicycle to generate electricity. The goal is to create a sequential lamp tree that lights lamps progressively as voltage increases, simulating a carnival game for students. Suggested solutions include using Zener diodes with resistors and power transistors to activate lamps at different voltage thresholds, enabling sequential lighting. Alternative approaches recommend not powering lamps directly from the generator but instead applying a load to the generator, rectifying the output if AC, and feeding it into an analog bar graph display or a large analog panel meter for a simple visual voltage indicator. Using a voltmeter display, digital or analog, with a resistor divider to scale voltage is also proposed. Additional resources on Arduino Uno R3 projects were shared but are not directly related to the lamp tree concept.
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How to Build Sequential Lamp Tree for Treadmill Motor Bicycle Generator Classroom Project

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