Introduction: Cycle Phone Charger

Picture of Cycle Phone Charger

When I ride a bicycle,the battery of my phone often gets used up

and then I can't do any work on my cell phone or call anyone.

So I thought of making a cycle phone charger.

This is a charger which takes energy form your bicycle

and converts it into electrical energy which is then used to charge phone.

So now lets begin..

Step 1: Materials Required

Picture of Materials Required

    For making 5V regulator

    • A 10uf capacitor
    • A 1uf capacitor
    • 1 L7805
    • PC board
    • Wires
    • A soldering iron(for soldering wires)

    For making generator we need-

    • A gear box with motor in it as shown in the image, you can get this from 'LED Full Color 360 degree Rotating Crystal Lamp' as shown/Dynamo such that it gives at least +9V when its shaft is turned even slowly.
    • A rubber wheel

    • M-seal

    • A strong cello tape

    • And an USB port

    Step 2: Fixing Rubber Wheel to Gear Box

    Picture of Fixing Rubber Wheel to Gear Box

    Take M-seal, gear box and rubber wheel.

    Mix the M-seal.

    Step 3:

    Picture of

    Fit it in the middle of the rubber wheel.

    Pierce the rod in the M-seal and leave it for 3-4 hours. So,that it could get solid.

    Step 4: Fixing of Gear Box

    Picture of Fixing of Gear Box

    Cut a piece of cello tape and

    fix the gearbox in your bicycle with help of cello tape such that

    the rubber wheel touches the rim of the bicycle so it can be turned.

    Step 5: Making 5v Regulator

    Picture of Making 5v Regulator

    Connect the L7805 and capacitors in PC board

    according to the circuit given. A voltage between

    7v to 15v 1A current can be given as the input.

    You can also see steps to make a 5V regulator on Instructables.

    Step 6:

    Picture of

    Connect the regulator to gear box as shown.


    Step 7:

    Picture of

    Connect the positive wire of the USB port to +5V output

    and connect the negative wire of the USB to the negative wire of regulator.

    Step 8:

    Picture of

    Now fix the whole system to your bicycle and now it is ready for use.

    Step 9:

    Picture of

    Just connect to your mobile and rotate the pedal.


    HelloProjects (author)2016-09-09

    How long do the wires need to be?

    PragyaS1 (author)2015-04-28

    Where can I buy an external USB port? I've looked in several places and can't seem to find one.

    SiddharthS95 (author)PragyaS12016-08-19

    Hello pragyaS1, it's good to inform you that you can find usb female port in an old phone charger.

    ShadabS6 (author)2016-01-25

    Can i set this arrangemnt on my bike

    shaikh.bony (author)2015-02-17

    Thanks for the post Rajat!
    btw, i have an old cycle dynamo that was in use for lighting the headlight.what modifications i must make to turn it into a phone charger?

    PragyaS1 (author)2015-01-31

    Does it matter what voltage capacitor I get? If so, could you possibly send me a link or website from where I can get one, please?

    Rajat Cool (author)PragyaS12015-02-01

    No it doesn't really matter.

    paul dito (author)2015-01-26

    Yeah, it can use some refinement, but technically it's good stuff. When I was a kid I had a dynamo that lit a headlamp using the exact same arrangement/technology... I get a little tired of 3d printed solutions. I don't have access to a 3d printer...keep up the good work!

    Rajat Cool (author)paul dito2015-01-28

    Thank you paul dito for appreciation.

    Mr AbAk (author)2015-01-13

    Rajat it gives output 5v but these days many chargers give output 5.1v so that your device quickly charges...
    so it will charge the device slowly...

    paul dito (author)Mr AbAk2015-01-26

    Mr Abak, think about your reply. Are you trying to say 100mV makes a difference? Do the math and report back to support your claim. Think about current while charging, not voltage...

    Rajat Cool (author)Mr AbAk2015-01-14

    It will not affect the speed because my charger can give 5.3V at top speed.

    Adam HaziqSalleh (author)2015-01-03

    i like your instructables and your idea in making this thing but it would be better if you can make it more neater because it was a little bit messy.. keep doing things like this especially accesories for bicycle

    I will surely make my next instructables neat

    personally i liked the 'messy' style. it made the tutorial very easy to follow. i often find projects with specific parts hard to source or aren't exact in your country. with this project i know what to upgrade and what is necessary to make it function. thanks for the great tutorial.

    Vsevolodovich (author)2015-01-10

    can i use this to any smartphones??i am so afraid it will explode..

    Rajat Cool (author)Vsevolodovich2015-01-10

    Don't worry it will not explode.

    Mr AbAk (author)2015-01-04

    Good instructable,
    nice start and
    this one was a headstart for you...

    Rajat Cool (author)Mr AbAk2015-01-10

    Oh, yes it was head start for me and thanks for appreciation.

    tadame (author)2015-01-03

    You should patien that really smart

    Rajat Cool (author)tadame2015-01-10

    Thanks tadame.

    Mr AbAk (author)2015-01-03

    Nice instructable!!!!

    Rajat Cool (author)Mr AbAk2015-01-10

    Thanks .

    profort (author)2015-01-08


    Rajat Cool (author)profort2015-01-08

    Thank You profort for your appreciation

    Radiat1on (author)2015-01-04

    You could use a piece of lexan and heat it until it bends to make a mount for your motor and a worm gear clamp to attach it to the bike. very nice instructable, thank you for your idea and your time.

    mtairymd (author)2015-01-03

    Ugly as hell but pretty cool. I like the connection from the rubber wheel to rim - very clever.

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