Introduction: Make Your Own Mini Quad Copter

A local school needed help with building a quad copter. They had bought the parts separately from Banggood at a good price but they sadly came with no instructions.

Here is a parts list (as far as I can determine from the packaging)

Transmitter: http://www.banggood.com/Hubsan-X4-H107C-RC-Quadcopter-Spare-Parts-Transmitter-Mode-2-H107-16-p-915638.html

Receiver: http://www.banggood.com/Upgraded-Hubsan-H107-X4-RC...

4 x Motors: (like) http://www.banggood.com/2-X-8x20mm-Motor-For-Hubsan-X4-H107C-H107D-RC-Quadcopter-p-87683.html

4 x Blades: http://www.banggood.com/Hubsan-H107-X4-RC-Quadcopter-Spare-Parts-Propeller-Blade-Set-p-72513.html

Battery: http://www.banggood.com/Wholesale-UDI-U816-U816A-Hubsan-X4-RC-Quadcopter-Spare-Parts-3_7V-240mAh-Li-Po-Battery-p-48851.html

Battery Charger: http://www.banggood.com/4-In-1-X4-Battery-Charger-For-Hubsan-X4-WLtoys-UDI-JXD-Syma-Quadcopter-p-933932.html

I had built my own quad copter and felt up to the challenge. After Googling some of the part numbers of the receiver, I determined that they were to make up a Hubsan H107 X4 RC Quad copter. Using this helpful link https://www.instructables.com/id/Cheap-flying-Lego-quadcopter, I was able to learn the motor connections.

The next task was to find or make some kind of base for the components. I decided to use an old CD-ROM case, cutting off the middle post. The well in the middle seemed ideal to house the receiver. Next I drilled 4 holes on the rim, just large enough for an interference-fit with the motors.

The motor wires were not long enough to reach the receiver so I added some short extensions. I had, in the meantime, been charging the little motor battery, which took 30 minutes approximately, using the supplied USB charger. Its LED turns on whilst charging and turns off when fully charged. I measured the voltage after charging and found it to be 4.18 volts.

Next, I put the blades on the motors and was ready to do some tests. I first turned on the transmitter, and its LED turned red. Then I connected the battery to the receiver and its two blue LEDs flashed alternately briefly then stayed on, simultaneously the LED on the transmitterl turned green and there was a little bleep to tell me that they were connected.

I then raised the left-hand lever to increase throttle and all 4 motors started spinning. Then I noticed that the blades were turning in the wrong direction, so I powered off and swapped the blades over. The correct layout is as follows: Motor 1 should be counter-clockwise, Motor 2 clockwise, Motor 3 clockwise and Motor 4 counter-clockwise. The motors are numbered 1, 2, 4 then 3 when counted in a clockwise direction around the receiver as viewed from the top.

Having swapped the blades, I tried again. The craft barely got off the ground a full throttle. At this point I decided that the CD-ROM case was too heavy and mostly preventing the flow of air up into the blades. I then used a hacksaw and craft knife to remove most of the case except for an X shape.

This proved successful and I was able to fly the craft, see video below (MiniQuadCopter.wmv). It is very lively and responsive and my flying skills leave a lot to be desired. The remote control also will probably need to be trimmed using the little push-buttons beside the joy-sticks. Some research is needed to find a lighter material and easier way to mount the motors and flight controller. All in all I found it to be a rewarding task and hope the students get as much fun and satisfaction building their own.

Comments

author
Full_Metal sk (author)2015-10-28

What was the total cost??

author
JackG39 (author)Full_Metal sk2016-01-27

£29.91

author
smandal13 (author)2015-08-23

great job

author
tomatoskins (author)2015-07-17

I think it would be awesome to see a video of it in action! usually the best way to do that is to upload it to YouTube and embed it in your tutorial.

author

Thanks for your comment. I did include a WMV video but it may not be visible to all, so I have done as you suggested - here it is on YouTube:

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Bio: STEM Ambassador, retired software developer, now teaching kids to code, play with Arduinos, Raspberry Pis and build robots at CodeClub, CoderDojo and after-school clubs.
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