MultiWii

funth1ngs

Hi,

Schachti wrote:you fly the MT3506 with 4S or 3S?

I have tested V2 with 3S/4S and 12x4.5 on my bench... Sync recovery works perfect!

Cheers,
Heiko

funth1ngs

Yes, I have the same motors...

Cheers,
Heiko

funth1ngs

Hi Schachti,

just use this (release\normal\bs_nfet.hex) package. You don't need to change anything.

Cheers,
Heiko

funth1ngs

Hi ziss_dm,

today I made some tests without propeller. I can hear a slight cklicking noise at nearly full speed. It's arround 1895 - 1900 us (with pwm_fast_200.inc). I guess it's just before transition to 100% duty cycle.

Is this normal?

Cheers,
Heiko

funth1ngs

Nice!

You can try 1095 ms as min pulse, that should also work. Max pulse should stay at 1900 ms, because that's max power with wii-esc. If you use 2050 ms, you will loose some resoultion at the upper end.

Did you already read FirmwareAssembling about creating the hex file?

Cheers,
Heiko

funth1ngs

Hm!

Try 1090 or 1050 ms as min pulse. Find the highest value which will start the motors.

Cheers,
Heiko

funth1ngs

Hi Eugen,

I guess you are using TC's converter? Try to set pulse range from 1100 - 1900 ms.

Cheers,
Heiko

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Hi Raptor4,

here is r195 with default settings for all nFET boards.

Cheers,
Heiko

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Hi Rich, - I've tried starting the ESC with analogwrite values of 0, 5, 6, 10, 20, 25 and even 50 and 100. I don't know Arduino very well, but the AnalogWrite docu says that with 0 the pin is always low. And with 5, the high pulse is maybe too long, because MIN_RC_PULS=18 with pwm_arduino_250. Try 1...

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Hi Bernhard,

nice work!

I have 4 Hobbywing Pentium 12A ESCs, but the MCU is the F334 with only 2kB flash. I guess thats not enough for your code?

Cheers,
Heiko.

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Hi Synthex, I would like to know if the Hobbyking SS Series 25-30A ESC SKU (HK-SS30A @ $5.99) works well with MultiWii ? it uses a Atmega8 or a C8051F330 ? This ESC has need to be reprogrammed to work better ? Is there a firmware for it ? Thanks a lot for your answers ! as far as I know, they have a...

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Hi Dieter, Please have a look on it. I'm not quite shure about port inits and AnRef. there is somehting wrong wiht your port initialization. #define INIT_PD 0 #define DIR_PD (1<<c_comp)+(1<<rcp_in) #define BRAKE_PD (1<<CnFET)+(1<<BnFET))+(1<<AnFET) All FET ports must be configured as output pins, c_...

funth1ngs

HI ziss_dm,

This way everyone can contribute(I'm a bad writer.. )

You are not the only one with bad writing skills

, but how can we edit this page?

I would suggest we use google code, it looks easier to use.

Cheers,
Heiko.

funth1ngs

Hi ziss_dm, go for it! I'm very happy with your software. There is one thing left, maybe we (or you ) can write a README which describes all the settings that can be configured with the hw/input files. Something like: Almost.. rpm = (motor rpm * rotor poles) / 2. ENOUGH_GOODIES - number of successfu...

funth1ngs

Hi wektorx,

wektorx wrote:Is it safe to flash (AVRootloader) ESC with connected battery?

I always use the battery connection when flashing via BL. If you try a new and untested firmware, it's better to use a regulated power supply (9V/1A) instead of a LiPo

.

Cheers,
Heiko.

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Hm, if you use the one from my zip it should be enabled. - Flash .\Bin\ESCBL1.hex via ISP an set the fuses BOOTRST and BOOTSZ (512 words). I checked your fuses, it seems that you set BOOTSZ to 256 words. I don't know if this will fix it, but please try: -U lfuse:w:0x3f:m -U hfuse:w:0xca:m And this i...

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Hi wektorx, ... 01.12.11-00:22:16-900 > Cmd.WriteFlash.ResCheck() Error: Verify failed ... I guess AVRRootloader is compiled without Flash verify: .equ UseVerify = 0 ; Verify FLASH command (FLASH write/erase have implicit verify, can be deactivated) Because the write command has implicit verify, you...

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Hi Andrej! I just tried Heiko's fuse settings (my original was different only in brown-out voltage). Since the symptoms are still present I'm posting avrdude output. Hm, the log looks OK to me. Did you reset the AVR with the "-e" switch? Please connect one ESC directly to a reciever and tr...

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Hi Andrej, I have not intentionally change fuses (I'm so fresh in AVR programing) so I'm using ziss_dm's manual how to upload using Arduino as ISP programer and modified _make.cmd form SVN (I'm Mac user that's why modified). Regards. try to reset the AVR and set the fuses: avrdude.exe -C avrdude.con...

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Hi ziss_dm, @Heiko So, this board has all n-FETs but they are not inverted? Why it is neccesary to change fuses? Maybe it is better to pre-charge bootstrap capacitors for this board? yes, this ESC has all nFETs (IRF IRLR7843) and works with the Mystery20A hw target. Somehow it uses 6 dual transistor...

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Hi Andrej, Hello, my tests are without props, but haven't removed BEMF caps. If you please mark them on the picture (TY-P1), I can do that. Regards Andrej Just tested my ESC with the attached version and it works very well (the BEMF caps are not removed). Did you set the fuses to ext. crystal / high...

funth1ngs

Hi all!

@ziss_dm
While with the ZCFastSlow branch the ESC was still resetting, the v0.12 always recovers. Well done =)!

@Andrej
I used Mystery20A and pwm_fast_200 with the TY-P1. Which revision/tag are you using?

Cheers,
Heiko.

funth1ngs

Hi ziss_dm,

ziss_dm wrote:Could you please try this version? The idea is simple: to have different ZC filter for low and high RPM. The question is: Is it worth to integrate it into main branch?

I can't test it before the weekend because I'am not at home.

Cheers,
Heiko.

funth1ngs

Hi ziss_dm, So, resets still happening? Unfortunately, yes. I noticed that with HIGH_SIDE_PWM enabled the ESC resets on any throttle change from 1300us to 1900us, while it's working up to 95% with HIGH_SIDE_PWM disabled. So I meassured RPM at 1300us an got: HIGH_SIDE_PWM enabled: 1680 RPM HIGH_SIDE_...

funth1ngs

Hi ziss_dm, Can you try to LOWER the second power curve point? PWR_CURVE_POINT(01, 3500, 25) PWR_CURVE_POINT(02, 5600, 50) The idea is: - When you rotate pot, it can change fast but not immidiate, so motor can keep up and everythingis fine - When RPM is low, the limiter limiting power to 50% and thi...

funth1ngs

Hi!

marbalon wrote:You think about three caps on the top right side on this foto?

Yes.

Cheers,
Heiko.

funth1ngs

Hi! @Marcin: Will try to tune STRT_ZC_FILTER_DELAY and will give you feedback when I get home. If this will not fix your problems, try to remove the BEMF capacitors on one ESC as the next step. It's possible that your capacitators have a greater capacitance what affects BEMF meassurement in a negati...

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Hi ziss_dm, But you are "loosing" 45W of power (according to the graphs), so maybe smaller prop is better? Yes and no, it's all about efficiency at hover throttle . For example, with a 11x5" the max thrust is 800g and with a 13x4.5" it's 1100g. If the max thrust of the 13x4.5&quo...

funth1ngs

Hi Andrej,

here is the picture with the ISP pins. I have only one TY-P1, so I never used it in a copter.

Cheers,
Heiko

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Hi Marcin, All version have a huge problem with motor startup, motor shaking about 3-5s then start working normally - all version except this attached to post above. It works without any problems. So I think changes related with Mt motors is not good for other motors... just checked that with 4 diff...

funth1ngs

Hi ziss_dm, today I played again with my MT3506 . I limited MAX_THROTTLE to 185 steps, and with the BEMF feedback capacitors removed the "screams" are completely gone, even with a 13x4.5 prop and a fully charged 4S battery. So I must retreat my previous statement that the behavior is the s...

funth1ngs

Hi simon and ziss_dm, I didn't realize you saw problems even with slow throttle increases. Does this also happen with my tree? I thought it was only a fast response change problem. This is with a 14" APC prop? Yes, I didn't notice that before, it only occurs on a fully charged 4S. With your cur...

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Oh, and i almost forgot to post some oscilloscope measurements of the MT3506 from Simon: Here are some from when I tried to do a differential measurement at the ACO AVR pins by doing math on my two-channel scope: ... I'm not sure how accurate the timing/spike behaviour is on both channels, though, s...

funth1ngs

Hi ziss_dm, Almost.. rpm = (motor rpm * rotor poles) / 2. ENOUGH_GOODIES - number of successful electrical rotations before checking RPM. RPM_START_MIN_RPM - minimal RPM for transition to run RPM_STEP_INITIAL, RPM_STEP_MAX - initially when there no back EMF, it starts commutation with RPM_STEP_INITI...

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Hi Marcin, But also tried to use method described above with bootloader but without success - can't connect from PC program. But I don't remove any capacitor because can find correct. Could you make describe with one did you remove ? It will not work with the capacitor, try to remove the one in the ...

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Hi, So like I described I probably don't need to R2 but you suggest 2k2 as R1. I will try other values if will have problems. But last question... R1 is a fixed value, you shouldn't have to change it. If you have problems, then try with different pullup/pulldown resistors (R2). I'm not AVR guru so I...

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Hi, So if I want to program only one ESC in the same time I need to only put resistor R1 between TTL-RX and TX? And there is no information about resistor values for Mystery 20A but this should be something about 4,7k-10k ? R1 (2k2) has something to do with the 1-wire stuff, you need this one in any...

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Hi Marcin, i have all my information from the ARM-o-Kopter Wiki . Here is a short summary in my own words : - Build this flash adapter . I think we don't need the pullup/pulldown stuff (R2) because we don't connect more than one ESC at a time. As I understand it, it also depends on the resistor whic...

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Hi marbalon, - What version should I use? Latest from svn ? O maybe hex file attached to topic? I would suggest you try r86 from svn. You only need to adapt the path to your AvrAssembler2 installation in _make.cmd (AS and AS_FLAGS). In my case it's: SET AS="%ProgramFiles%\Atmel\AVR Tools\AvrAss...

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Hi ziss_dm, 750 - is too low. Remeber, this is electrical RPM. Oh... , so electrical rpm = (motor rpm * stator poles) / 2? Is this correct? Speaking of settings, can you please tell me if my understanding of them is right : RPM_START_MIN_RPM Minimal RPM for transition from starting into running mode...

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Hi, But looks like it also limiting the current (was 42 now 36). Not necessarily, because the sample rate is really slow. I measured spikes up to 45A with r90. The question is: Is it worth it? Nope it's not, because we also lose the fast response at normal changes. And the case with a 70% throttle j...

funth1ngs

Hi ziss_dm,

the spikes are still there. Is it possilbe that the filter is causing some "input lag"?

I also soldered a second capacitor (220uF/35V) on the ESC, without any noticeable changes.

Cheers,
Heiko.

funth1ngs

Today I played with my old UniLog (MT3506 on 4S). Unfortunately, the capture frequency is only 16 Hz. But maybe someone is interested...

Cheers,
Heiko.

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Hi, r73 introduced some startup problems. With r84 everything works very well again. I only have resets when throttle is realy low (below 30% (1,30ms) on 4S) and changed rapidly. If the throttle is above 30%, I can change it as fast as I want without any reset. I have timing problems (screams) on th...

funth1ngs

Hi ziss_dm, r35,r38: The startup is very smooth, no problems anymore. The resets caused by the throttle changes are gone, sometimes the motor "screams" for 1-3 seconds before it reaches the desired speed. The motor finally becomes usable. Thanks again for your very good work =). v0.9: The ...

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Hi ziss_dm, sorry for my late reply. Here are some test results with the MT3508: r35,r38: The startup is very smooth, no problems anymore. The resets caused by the throttle changes are gone, sometimes the motor "screams" for 1-3 seconds before it reaches the desired speed. The motor finall...

funth1ngs

Hi,

it seems the problem increases with the voltage, it's bigger on a 4S than on 3S.

Cheers,
Heiko

funth1ngs

Hi Quax, I know what you have written, and I'm not setting throttle from 0 to 100% anymore . As I mentioned before, the ziss_dm modification works great on a RCTimer 2830-14 750KV motor. I only have these problems with a RCTiger MT3506 650KV motor. And by fast throttle changes I mean setting throttl...

funth1ngs

Hi ziss_dm,

it's weird. Throttle needs to be over 15% to successfully switch into running mode. The problem with the fast throttle changes is still there, it's a little bit worse than before.

Cheers,
Heiko.

funth1ngs

Hi ziss_dm, I tried v0.6 with the increased ZC timeout and startup was working very well, but it's causing resets during fast throttle changes. Then I tested r32 from svn, and I couldn't notice any diffrence to unmodificated v0.6. But... Simpliest solution would be to replace resistors in ZC attenua...

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