MultiWii

KaiK

Yes, I know this item, which is a real TTL-RS232 + Inversion device.

But I meant this super simple small PCBA which only uses a Transistor for inversion (as FRSky receivers understand TTL 5V but need inverted signal).

KaiK

@Timecop: Where did you get this tiny transistor PCBA from shown in viewtopic.php?f=7&t=1929&p=19309&hilit=frskyadp#p19309
I guess it is just the well known voltage inversion circuit?

KaiK

For me it is very difficult to detect failure, then lower throttle+level plane etc...
It would be great to have the ability to arm with switch at any state of level of plane/throttle OR to rearm automatically from failsafe if RC recovers within x seconds.

Kind regards
Kai

KaiK

Hi guys, today I discovered a strange behaviour on my Bixler/MW 2.2 Airplane setup. It seems, that the RC connection where lost for some seconds, but it obviously recovered. I could control the airplane servos, but the throttle couldnt be reactivcated. So I had to land outside the airfield. My confi...

KaiK

Did you check the noise of signal?

KaiK

Where do you connect +5V to Arduino board?
Is the GPS connected to 5V or 3V3 of Arduino?

KaiK

Problem wasnt the updaterate, but a wrong variable declaration causing a overflow.

Just checkout or download the latest output.ino from shared in repository...

KaiK

I am pretty shure (as I have the Unidirectional 100U) that is works like this:

Bidirectional (100B): 0A -> VCC/2
Unidirectional (100U): 0A -> 0.6V (or another value near 0V but not equals 0V).

KaiK

I think it would be useful to integrate the !f.armed -> MINCOMMAND feature or is this implemented for Motor[i] at another place?

KaiK

PatrikE wrote:Done

Shure? Cannot find any difference in shared regarding this (e.g. in output.ino)

KaiK

Yes, please do

KaiK

I will integrate a switch to select between MOTOR and SERVO and upload to shared later...

KaiK

Thanks for your reply. The workaround seems to work! We have to be careful, because the "security feature" (see below) is overwritten by the map/constraint. if (!f.ARMED){ servo[7] = MINCOMMAND; // Kill throttle when disarmed } else { servo[7] = rcData[THROTTLE]; } I tried to manually set ...

KaiK

Hi guys, airplane mode in Mega seems to work so far, but one problem left: MINCOMMAND and MINTHROTTLE have no effect (checked with scope). My ESC fails to initalize. In the guy the minimal command on throttle channel is 1020, which I was able to find in the config.h, but no in any throttle context. ...

KaiK

Hamburger wrote:Extending that existing command sounds good enough to me.

timecop wrote:Why would airspeed need to be in misc msp with power meter junk. if there is no space in imu/sensors one, then make a new one.

Any consent in this?

KaiK

Checked it with a scope and made a little test in airplane (on ground): Seems to fix it!

KaiK

The APC220 works transparently on current Multiwii here. Just set the APC220 to the max. Baudrate (56000) via its software config tool and modify Multiwii Serial0 Baud to the same rate...

KaiK

KaiK

VCC/2 on bidirectional sensors...
But you have a unidirectional with twice the resolution...

KaiK

I hope Multiwii will be more popular for using with planes in the future and will developed in this direction, too, to get a full "Airdrone suite"

So I think its a interesting sensor, espacially for autothrottle and landing...

KaiK

Just solder the + Pin of Lipo to IP+, IP- then goes to your motors...
VCC is +5V (from ESC or Arduino), GND is GND, VIOUT is the signal, which is 0.6V when power is zero and 4,6V when power is 100A.

Just measure Voltage with multimeter between GND and VIOUT and you will see, if this works.

KaiK

Great. I will try it and scope it tomorrow.

KaiK

Thank you for your comments, Hamburger! I started with Revision 1113, as stated in folder naming. Please see the differences below. Any feedback, especially regarding speed (improvement) and type cast (int -> float -> int) are welcome. I will add this to shared if some of you give a ok... I didnt mo...

KaiK

Hi guys, I implemented reading true airspeed (differential pressure) using the MPXV7002 sensor, which is part of e.g. the DIY drones airspeed kit. I partially orientated on the ardupilot code (averaging, zeroing). The measured airspeed is transferred in cm/s via debug[3] and MSP_MISC (2nd entry) cur...

KaiK

Might be the same as documented here: viewtopic.php?f=8&t=2385

KaiK

I tried it some minutes ago with the latest checkout from Shared, but it is still the same. High periods of PWM is jumping between 1ms and 5ms when the GUI indicates a changing (eg. when moving the IMU -> changing servo signals, moving throttle stick -> changing ESC signal)... This is really weird...

KaiK

Hi guys, I am just implementing an airspeed measurement (differential pressure) into the MWC code and struggling about how to transfer the data (uint16=serialize16) via the serial protocoll. My first tought was transferring it via MSP_MISC which currently is only used by powermeterTrigger1 and has 8...

KaiK

Couldnt check it until now.
What do you mean with MIS?

KaiK

Hi guys, maybe it wasnt clear. The high period doesnt change like expectet. The GUI shows the expectet values, but the high signal only jumps between 1,2ms and 5,2ms (nothing between this). It jumps when not armed (idle), too... The servos are going crazy with this.. May a video of the oszi measurem...

KaiK

In my attempt to make the airplane code work with the mega1280 i have run into troubles, mainly i dont understand the servo out code at all, while the motor out code is straight and easy. So i did define airplane to have 4 motors. The advantage of having 4 motors on a mega1280 is i can use hardware...

KaiK

Hi guys, just checked it with my todays arriving Arduino Uno. It gives a clear and good PWM signal. So I think there is something wrong with the implemetation for Mega boards. Unfortunately I am not very familiar with all the timers/interupts stuff. Does someone of you have an idea where to search/h...

KaiK

I cannot imagine the I2C voltage level will have any influence on the control...

KaiK

Hi guys, did one of you successfully run Plane mode on a mega board? I have connected everything correctly (using D2 for rudder, D3 for engine, D5 for elev and D6 for the wings) but the servos are going crazy and the ESC is beeping (no signal). Du to that I analyzed the the PWM signal with a oszi an...

KaiK

@Hamburger: Great, didnt notice that. Saw the powermeter efforts but no finished hardware current sensor implemetation.
Didnt find this at your link stated.

Can you provide more information or refer to the lines in code?

Thank you
Kai

KaiK

I have bought a ACS758LCB-100U-PFF-T at Ebay for 10 usd, it is working great on the CL-OSD...

next weeks I will give it a try on Multiwii...

KaiK

Hi guys, as I played around with e.g Multiwii all in one app for Android on my tablett and had a look on different GCSs (Not Multiwii related) I had the idea to use Multiwii more for telemetry. I think this could be a great step which could be combined with programming a ground control or using some...

KaiK

I hope this is a joke!

KaiK

+1

We have to ensure the distance between "Subchannels" is great enough to avoid malefunction (recognice wrong level)...

KaiK

Hey guys,

I am thinking about, which data records are used by the multiwii software?

Did I discover right in the sourcecode, that its only using GGA (fix information) and RMC (coordinates)?

Regards
Kai

KaiK

Hey guys,

can you tell me, whats the max. useful update frequency for the GPS modules? In which frequency the MWC control does use the data?

Some guys run the GPS module at 10Hz, but I dont think MWC makes use of this?!

Regards
Kai

KaiK

Its called Modulo Operator: http://en.wikibooks.org/wiki/Reaktor/Mo ... ulo,_x%25y

KaiK

Yeah +1

KaiK

Joe.W wrote:So "Acro mode" means the Acc is off? And "Level mode" means Acc is on?

Correct.

KaiK

in this context: is there a way to disable the stick functions for arming/disarming?

KaiK

I would power the Arduino directly from the Lipo, because of lower noise than ESC 5V.
Arduino should work with 3S (and you could use one or two diodes to lower some volts...)

KaiK

You dont need a LLC, just put a 1K resistor between Arduino TX and BT RX (vice versa should be safe without resistor i think).

KaiK

You should be able to connect and see rotation of copter.
Anyway you should be able to connect and read/write values if you dont have connected any sensor...

KaiK

Are they beeping?
I needed to set

Code: Select all

#define MINCOMMAND 900

and

Code: Select all

#define MINTHROTTLE 1200

KaiK

Pinout and naming of them should be the same as Seeeduino Mega which you can find in the pdf.

KaiK

http://multiwii.googlecode.com/svn/trun ... 20v1.8.pdf

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