MultiWii

howardhb

Hi @alexmos. Yes, I realise that expo (around the hover throttle point) will greatly improve altitude control (by the pilot) when Baro is not active. (meaning, less sensitive to small changes to throttle stick, when applying yaw inputs) Would you share your code for throttle stick altitude control w...

howardhb

In Port Elizabeth, South Africa, I have to run the my 5883L gain set at 0x30, otherwise, I get "saturated" values like you report. You should always re-calibrate the Mag (after changing gain settings) by pressing CALIB_MAG in the GUI. Also, when calibrating, make sure that you turn the cop...

howardhb

Here is an interesting article from NASA: http://cafefoundation.org/v2/pdf_tech/N ... Review.pdf

howardhb

Large, slow moving props are quieter, and more efficient.... Your motor Kv of 930 is fairly low, so that is good! There are 750Kv motors available, so you could run 12x3.8props: m Also, you should sand/polish all the sharp edges off your props, and try to have "rounded" tips. (Be sure to b...

howardhb

@jessestr, have a look at this post: viewtopic.php?f=7&t=623

howardhb

Sounds like a very usefull mod. I will try this soon too. (V2pre2) While flying in level mode with Baro activated yesterday (taking gopro video footage) I found it difficult to maintain constant height because necessary Yaw stick movements invariably apply small but significant throttle changes. I m...

howardhb

And, we already have I2C LCD (Eagletree powerpanel, #define LCD_ETPP) so hacking a solution for this display shouldn't be too difficult.
sample code for the I2C OLED dispaly is here: http://www.wide.hk/download/i2c_OLED.rar

howardhb

Good idea Indeed! (Real pilots do this before take-off!)

I've tested MultiWii_2_0_preversion2, with your changes. (BMP085)
Works fine!

Thanks!

howardhb

Yes sir! That will work!

howardhb

Just tested In-flight calibration with V2.0 preversion2 using stick method. My copter has ITG3205, BMA180, HMC5883L and BMP085 with PPM SUM with Spektrum Orange clone 6ch receiver. Using SuperSimple HK-HW20A ESC's flashed with latest SimonK firmware: Very big improvement in stability - smooth flying...

howardhb

Hi Alex.

I ordered this one, a few days ago, with the same idea of leaving it on the copter. (waiting for it to arrive...)
http://www.ebay.com/itm/130566448551?ss ... 129wt_1163

It interfaces specifically on I2C at address 0x78 (8-Bit address) or 0x3C (7-bit address)

: Micro OLED

howardhb

After procrastinating for a long time, I've flashed the three HK Super Simple 20Amp ESC's on my Tri-copter with latest TGY firmware. Instead of just soldering the programming wires, I made a "clamp" type connector from a plastic clothes-peg and hot-melt glue. ESC_RE-FLASH connect tool.jpg ...

howardhb

Receiver that output PPM: m There are a few more but can't seem to find now...However, have you thought about using a PPM "converter" board. Specifically, this one: m I have used it and it works perfectly. The only issue is "another" piece of hardware to mount on the copter! You ...

howardhb

You may be "in luck".... 35 and 40MHz receivers receive the PPM SUM signal (exactly as you need it) directly from the transmitter! (2.4GHz systems don't send / receive PPM signals at all... Spektrum is actually like RS-232 at 115Kb/s) You should "probe" the receivers digital circ...

howardhb

Luckily, I found the "noise" just before flying! The trace of your 4channel receiver signal shows that the transition Low / High / Low (between channels) is very fast, quite short duration and you would most probably NEED the NPN transistor to "shape" the signal more square. If y...

howardhb

The number of permutations of axis configuration is incredible, considering the number of different boards, bobs and shields! Maybe this has been discussed before but, my question: Is it conceivable to have a setup "wizard" in WINGUI to set-up sensor axis automatically? It would really ben...

howardhb

mincommad was mysteriously set to 9050

So sorry to have wasted your time.
H.

howardhb

Hi @biddibiddi I tried without the transistor. It works fine without motors running, but with motors on, there was a some of 'noise'. The addition of the transistor squares the waveform nicely, but it does invert the signal. Working perfectly now. To overcome the signal inversion, I changed the defi...

howardhb

Testing 1.04..... (dev 20122025) A small problem with displayed motors bar-graph. With Tri-Copter.... When #define MOTOR_STOP is enabled, and rcValue[THROTTLE] < 1100, the bar-graph for each motor indicates FULL, and each motor displays a value of 9050. Thanks again! Being able to save and re-load s...

howardhb

If you want to be able to define the roll / pitch max / min values, and activate it using the BOXCAMSTAB in the GUI.... #ifdef SERVO_TILT if (rcOptions & activate[BOXCAMSTAB] ) { servo[0] = constrain(rcValue[CAMPITCH], TILT_PITCH_MIN, TILT_PITCH_MAX); servo[1] = constrain(rcValue[CAMROLL], TILT_...

howardhb

@ BadBert, yes! To get 8 channels of RC control into the MW, connect the serial output wire of you receiver to the THROTTLE channel on MW. In CONFIG, look for #define SERIAL_SUM_PPM and un-comment one of the definitions....... There are 3 predefined definitions that work for specific receivers...., ...

howardhb

howardhb

Blade Grip modified....

howardhb

I lengthened the arm on the blade grip because the servo has quite a lot of 'slop' and caused jitters when PID was set above 3.
I am now running Yaw PID at 7 , 15, 8.
Heading-Hold is rock solid.

howardhb

The yaw bearing assembly is achieved by using one, 450 size heli main blade grip and it's feathering shaft. An 11mm diameter piece of aluminium, cut to the correct length, is used to assemble the bearing arrangement.... The aluminium piece must be cut to exactly the correct length so that when the s...

howardhb

Hello.
The motor mount plate slides into a slot in a 11mm diameter piece of machined aluminium.
450 size heli carbon fibre booms are exactly 11mm inside diameter.
The boom also needs a slot in each side to accommodate the motor mount plate.
An M3 cap-screw holds the complete assembly in the boom.

howardhb

I like it!
Tested 1.9 on Win7 32bit
Only ARMED doesn't light up.
Mentioned before, compass is 180 deg off.

Being able to save and re-load a good working Config is marvelous!
(I used to hit PrintScreen and save a jpeg of my settings

)

Muchisimas Gracias!

howardhb

Nice font! except, Tri-copter flying backwards!!!

I've changed it.....

howardhb

Copter falls immediately on Baro activation.
BaroPID is always negative. ( -80) so RcCommand[Throttle] drops by 80 on Baro activation

ACCZ is 255 with copter stationary on the desk (with motors running)

howardhb

Not sure why yet, but I get no output debug for AltPID.
I see you are using FREEIMUv035MS using MS561101BA
I'm using individual sensors:
ITG3205
BMA180
BMP085
HMC5883
Also, PPM sum with Spektrum 6ch Orange clone Rx

howardhb

Thanks....

howardhb

Can you please advise starting P I D to test your code?
Going to test it now.
Thanks

Howard

howardhb

Early on Sunday morning, after flying perfectly stable for about 4 minutes, the copter went into a 45 degree right / down dive... totally uncontrollable. Crashed into my neighbours roof! (The GoPro footage is scary!) I had to totally re-build the copter. Even the yaw servo's gears were smashed. I su...

howardhb

@ Spejlo thanks for this!
It is working perfectly for me!
Six 1N4148 diodes and a 6k8 pull-down resistor !

I noticed a small offset on all the channels so I subtract a small 'trim' for each channel.
rcValue[chan] = difff - 57;
Now I get perfect 1500 microseconds on centre sticks !

Howard

howardhb

Fantastic!

howardhb

Finished assembling the copter at 1:45am! Flashed the board with 1.8.2 and set up the PID's as standard. (I'm using a DIY Drones PPM Sum encoder with a "clone' orange Spektrum DSM2 6ch. receiver strapped under the battery to try to eliminate radio shadow ) I changed the camera gimbals' Roll ser...

howardhb

And an exploded view...

howardhb

Here are the manufactured parts....

howardhb

Hello all! I've designed this small aerial photo/video Tri-Copter to be as simple as possible. Paris V4r3 bare-board populated with: Arduino ProMini 16Mhz 5V, WM+, Nunchuck, BMA085 barometer and HMC5883L magnetometer. Using Turnigy 1050KV motors with 8x4 props, on Turnigy Plush 18A esc's. HK922 digi...

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