View Full Version : micro quad

05-13-2011, 03:09 AM
here is my latest work of epic awesomeness

The frame is made of balsa wood in the center and .9mm*3mm carbon fiber strips
glued together using very tin CA (superglue) and gap filling CA

the balsa wood core will be sandwiched between 2 sheets of 1mm thick carbon fiber glued together with JB Weld for extra strength

This frame should hold up for a long time :)

The motors are just temporary until the new motors arrive, these little ones aren't powerful enough to get the quad off the ground.

motor to motor distance is 4.75"

Now for the eye candy:

More pictures to come as I cut up the carbon fiber sheets and glue them on

05-13-2011, 03:34 AM
What controller do you plan for it?

05-13-2011, 04:20 AM
I'm going to start with the ti msp430 wireless dev tool
and then i'll move over to a custom controller board with an itg3200 and bma180 and atmega 328

here is the msp430 kit

05-13-2011, 04:56 AM
Well, how cute! Why don't you make like 10 of them and drop them off from a large quad?! :P

What motors will you use?

And BTW, would the AQ Mini fit on your quad?

05-13-2011, 06:14 AM
The aq mini MIGHT fit, mine will arrive tomorrow so i'll find out for sure then. The center balsa wood piece is 1.5"x1.5" so the shield will definitely go over the edges

i'd like to grab the brd file for the mini shield and modify it to be a little smaller and hold 4 mosfets to drive the brushed motors
unfortunately, the brd file for the mini isn't available :(

as for the motors, i ordered a bunch of the walkera ufo #8 motors
i found a US seller that has these motors on ebay, they're not ufo #8 motors, but they will work

i've got motors for 3 of these tiny quads so i'll be making at least 3 :)

05-13-2011, 03:01 PM
I have a 1.3" x 1.3" PCB design concept I'm toying with

http://i.imgur.com/ZFzUu.png (http://i.imgur.com/ZFzUu.png)

(hint, the right part double-duties as the AVR programmer and snaps off after manufacturing)

05-30-2011, 01:26 AM
Nice PCB's. Are those arms supposed to be soldered in on the main PCB and act as arms, while the solder act as screws?

I'm thinking, why not make the PCB be the frame too? I think that would be great for such a small quad.

If you want to just test your concept, it's pretty easy to just hook up your MOSFETS's straight to the AQ Mini shield's motor outputs and of course mod the code so that it goes 0-100% duty cycle PWM, and not the 1-2ms periods. That's a fix that takes 2 seconds, just changing 4 numbers in the code.

Frank, I can't see everything you've done, but I don't see any resistors associated with the FET's... If those aren't very special FET's, I wouldn't recommend using them straight from the µC outputs.

I did this a long time ago to replace the X-Ufo controller board:
http://www4.mediafire.com/imgbnc.php/db5e03177233ebf19600bcc3c5dd787de020e319ba12bf0b91 3e19407d0155dd6g.jpg (http://www.mediafire.com/imageview.php?quickkey=rbvgoc5qlon02mf&thumb=4)
http://www0.mediafire.com/imgbnc.php/02e0f736e4d29d8a92fcef80544a6f9112481d066529f5e96b 11c9dce282b0fc6g.jpg (http://www.mediafire.com/imageview.php?quickkey=5qzr9wib22o4x5q&thumb=4)

Worked well. Now I'm getting more and more interested again to make a real nano copter. I'm thinking like a 328 and ITG and 4 FET's only on the same board, nothing else. Only "obstacle" is the 9g receiver for me.

05-30-2011, 01:58 AM
Frank, I can't see everything you've done, but I don't see any resistors associated with the FET's... If those aren't very special FET's, I wouldn't recommend using them straight from the µC outputs.

Those are N channel MOSFETs

The design has been evolving drastically for the past few weeks, what you see there is very old

Can you explain why using them straight from uC outputs is bad? From what I learned at school about 4 months ago, there's almost no current at the gate, and VGS is controlled by the uC.

I added pull-down resistors to my design

05-30-2011, 03:12 AM
I think for now, what i'm going to do is make a really tiny mini shield that has an itg3200 and an adxl345 on board along with 4 mosfets
as for the rx, I think if I take the casing off of my turnigy 9x rx it will be very light weight. if that doesn't work i can always use the rx from my old HK 6ch radio and just take the additional satellite off to reduce weight. I won't be flying far with these micro quads anyway so i don't think it will be a problem.

The next revision however, will have everything on a single circuit board. I'm getting more familiar with eaglecad now and thing's arent as frustrating anymore

I just need something really quick and easy that I can get flying in 3 weeks or less