How to Make a Hand Powered USB Charger




Introduction: How to Make a Hand Powered USB Charger

About: Hello Guys, I am techgenie, an Electronics hobbyists, tech tinker and developer. I dedicate my free time in designing and making various creative and innovative projects, RC toys, Incredible Gadgets, Awesome...

We all know that when the electrical power is supplied to a motor, it rotates mechanically but when the shaft is rotated mechanically, the motor generates electrical power. So, in this Instructable, we will work on a small project that will utilise this above said principle on a geared DC motor to work as a electricity generator for making a hand powered 5v USB Charger for mobile phones. This device can also be used as a 5v DC power supply for various projects.

Step 1: Watch the Video

The best way to understand a "How To" project is through detailed visual instructions. In this video, you will learn How to easily make a Hand powered USB charger for your gadgets. However, also make sure to visit step 2 for additional details and pictures.

Step 2: Order Parts: Components

  1. 12v Geared DC motor -
  2. General purpose PCB board -
  3. 7805 voltage regulator -
  4. Capacitor 1000 uf -
  5. Capacitor 100 uf -
  6. Female USB Port -

  1. 12v Geared DC motor -
  2. General purpose PCB board -
  3. 7805 Voltage regulator -
  4. Capacitor 1000 uf -
  5. Capacitor 100 uf -
  6. Female USB Port -

  1. 12v Geared DC motor -
  2. General purpose PCB board -
  3. 7805 voltage regulator -
  4. Capacitor 1000 uf -
  5. Capacitor 100 uf -
  6. Female USB Port -

From Home & Local Store: Wooden Stick, Plastic Bottle Caps, Spare CD's and Straw.

Step 3: Required Tools

Step 4: Procedure: Rotating Shaft Mechanism

1. Remove the label from the CD to get a clear transparent Disc.

Note:Watch the video to see how it is done...

2. Take 2 plastic bottle caps and using Hot glue, paste a cap at the center of the CD.

3. Flip the CD and paste another cap near the outer boundary.

4. Drill a hole at the centre of both the caps.

5. Take a 12v geared DC motor, fix the CD in the motor shaft and fill hot glue in the bottle cap.

6. Take a wooden stick of about 10 cm in length, insert it in the other hole and secure it using Hot glue.

7. Insert a straw over the wooden stick. This will act as the handle to rotate the motor shaft.

Step 5: Procedure: USB Charging Circuit

1. Take a small piece of general purpose PCB board and a 7805 voltage regulator IC.

2. Insert and solder the IC on the PCB.

3. Take a 1000 and a 100 uF capacitor.

4. Refer to the schematic and pin configuration of 7805 IC, insert and solder the 1000uF capacitor to the input pin of 7805.

5. Similarly, Insert and solder the 100uF capacitor to the output pin of 7805 IC.

6. Make all the Ground connections.

7. Take a female USB port and refer to the above image for pin configuration of USB port.

8. We only need Pin 1 and Pin 4.

Note: If you need to make an iphone charger then you will need to generate a voltage difference of about 2.1 v on both Data pins (Pin 2 & Pin 3) as well.

9. Insert and solder the USB port to the PCB.

10. Refer to the schematic and connect the USB port to the output of 7805 IC.

11. Take the motor mechanism we made earlier, refer to the schematic and connect the motor wires as input to charging circuit.

Note: If the Mobile doesn't charge, try rotating the motor shaft in opposite direction to reverse the polarity of current.

12. Using Hot glue, paste the circuit over the motor.

Step 6: Test the Circuit

Our hand powered USB charger is now ready. Connect a mobile phone to the USB port and rotate the motor shaft at a uniform speed. We see that the mobile starts to charge really well. However, the charging speed will surely depend on the current generated by the motor.

So Friends, this here concludes the instructable. Do come back soon for new ones or SUBSCRIBE to receive regular updates.

In case you might have missed, have a look at the video and see how I made this Hand Powered USB Charger at home.

Make this awesome Gadget yourself and contact us or share your experiences on our facebook page, twitter and instagram. You can also SUBSCRIBE to our Youtube Channel GOODTECH - Creativity And Science, where i frequently post new and creative content.

Thanks For Your Support..!!



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    9 Discussions

    Very cool, easy to follow instructable. Thanks for sharing. Approximately how long does it take to fully charge a smart phone using this device?

    2 replies

    The motor i used generates just about 500mA at 5v, so it will be practically impossible to completely charge the phone just by rotating the motor shaft with hands. It is more of a demonstration project and requires few modifications in order to be useful practically like attaching the motor shaft to the bike wheel or attaching it to the treadmill, so that the phone gets charged without any effort.

    Yeah, like having the motor attached to the wheel of the bike and charging your phone in a pouch under the seat.

    Very nice, specaly using 7805 for Vc,

    Very nice work, how many time for charging phone Li-ion battery from 20% - 70


    5 replies

    The motor i used generates about 500mA at 5v. So, in order to charge a 2000mAh battery, this device will ideally need 4 hrs, which is practically impossible. This design is basically an emergency charger and to make it much more practical we need to attach the rotating shaft to a bicycle or bike wheels, so that the phone can charge effortlessly.

    what modifications can be done in order to increase the current generated..

    The motor i used generates about 500- 600mA at 12v, that is regulated to 5v using 7805. However, a simple way to increase current will be use a different motor. You can also eliminate the 7805 and then you will need is to make a new circuit that steps down this 12v to 5v and substantially increase the current.

    I would be glad, if someone here could contribute to what kind of circuit will be most efficient.

    how would you conect it to the bike???

    Hi fun4joe,

    Its quite easy to connect this mechanism to a bike wheel. You need a small rubber wheel(as in toy cars) and attach it to the motor shaft.

    Now, find an adequate place on the bike to fix the motor such that the wheel touches side surface of the bike wheel. Now, when the bike moves, due to friction, even the wheel connected to the motor shaft will move and in turn generate power on the motor terminals.

    Attach wires to the motor terminals and stretch them to the handle where the mobile can be charged placed on a holder.

    You can also connect LEDs to the motor and attach them to the bike frame, such that when the bike moves, the LEDs will glow giving a very cool effect.