MultiWii

mr.rc-cam

Reloaded dev 20102522 with the code that comes with the dev for the L3G4200D and it throws i2c errors. The modified code is the one to use but when put into the 616 618 dev's it doesn't work. It seems odd that the stock dev code is causing I2C errors only on the gyro. The address it uses looks good...

mr.rc-cam

Load the old MWC V2 version that was "working" well for you. Confirm that all the sensors are running in the GUI. If you still see I2C errors then you may have a sensor problem or the I2C pullups need attention. Typically such problems are due to incorrect pullups.

- Thomas

mr.rc-cam

This seems to describe my issue: m ... st21959506 Now that is interesting. I'm using Simonk's ESC firmware (downloaded June-1-2012) on my 450 Quad and it flies great with MWC V1.9. But with V2.0dev I have experienced exaggerated pitch/roll during aggressive movement. But since it does not happen wi...

mr.rc-cam

Until I saw it for myself, I never thought the bullets would cause any trouble. There's a couple other fellows on this forum that have also been bitten by this issue. The connectors certainly look robust. But If you tear the plug side apart you will see it is actually two pieces swagged together. Th...

mr.rc-cam

Tough one. But just to throw a curve ball at you, don't limit the investigation to the obvious things affected by a fresh charged battery. Maybe it is something totally unexpected. For example, I spent several days chasing down randomly sputtering motors. The problem would move from motor to motor, ...

mr.rc-cam

Comment out the ADXL defines so that this sensor is disabled/ignored. If you still have I2C errors reported in the GUI then the problem is affecting more than just the ADXL. But if no errors are seen with the ADXL removed from the code then you will at least have narrowed down the issue to either an...

mr.rc-cam

With the above code included the board works OK in V2 and DEV 20120522 the ADXL Address in V2 and DEV522 is 0xA6 in the 616 and 618 DEV's the ADXL 345 address is 0x53 in def.h and in the sensor tab it is 0x1D with the 0x53 address commented out underneath. An 8bit address of 0xA6 would be 0x53 in 7...

mr.rc-cam

Tried with dev 20120522 same settings and the IMU works as it should, only thing I have found that is different is the address for the gyro has changed in the dev 616 and 618 versions. The I2C address changes to the sensors got me too when I loaded up MultiWii_dev_20120606. These little code tweaks...

mr.rc-cam

I saw there are two versions, one with housing and one without. I recommend the one with the attractive plastic case. It only adds a couple grams of weight and it looks better than the shrink wrap version. And of course you can always remove the case (4 screws) and shrink wrap it yourself if you la...

mr.rc-cam

In order to add easier other sensor, the code part of each sensor follow now the sensor spec.
viewtopic.php?f=8&t=1259&p=12168

Thanks for the background information. The explanation for the orientation changes makes sense.

- Thomas

mr.rc-cam

The device is controlled via PWM? I had only partial success with PWM (results were not consistent). The protocol that worked reliably for me is based on a symmetrical frequency burst as described in post #3. So is it possible to blink two LEDs and beep the buzzer!? You can have any combination of ...

mr.rc-cam

I've been using V1.9 (release 3) for many months and I like it. A lot. But I today I decided to upgrade to V2.0. So I grabbed the latest dev version from the SVN. I know dev releases can be a gamble, but I noticed many reported bugs on the original V2.0 release so I figured I had nothing to lose. De...

mr.rc-cam

The new ESC's are very affordable, so that is good news. Are you planning to reflash them before installation?

- Thomas

mr.rc-cam

The ESCs are making the characteristic Plush 'clicking' sound which I believe is a ESC -> motor timing issue, and I was hoping that re-flashing the ESCs might solve this problem as well as make the ESCs more efficient. +1, I expect you will experience such improvements with the magic ESC code. If I...

mr.rc-cam

Attached is the basic code that is needed to control Pilot Lamp's three LEDs and buzzer. It is a pde file that is added to your MWC source code folder. You can rename it with the .ino extension if that is how you roll. You simply plug the Pilot Lamp's 3-wire cable into MultiWiiCopter's Buzzer port (...

mr.rc-cam

That is too bad; Looks like you'll need better ESC's to solve the over-temp issue. I suppose my preferred mounting of ESC's exposed to moving air / prop wash is a good thing.

- Thomas

mr.rc-cam

The high temp could be from the ESC's linear Vregs or FETS, so it would be helpful to determine which is heating up. I suggest you power up the model with motors disarmed and then see if the ESC's remain cool after a few minutes. If they start to get too hot then there is something odd going on with...

mr.rc-cam

I wrote some preliminary MWC code to control the three LED's and buzzer. I'll post the sample code soon; In the meantime, here is a YouTube demo of my test code that sequences the three LED's and beeps the buzzer: m By the way, the buzzer is loud! For bench testing I've stuffed a piece of sponge in ...

mr.rc-cam

I was able to control the buzzer and lights using a Function/Signal (frequency) generator. I don't expect my findings represent the official communication protocol, but my clumsy solution works. The control waveform should be symmetrical and it can be idle when not writing/changing new states, but a...

mr.rc-cam

I received the Pilot Lamp device today and took a peek at the circuitry. It uses a STC11F01 MCU (8051 core). The communication signal on its 3-wire cable is not connected to the MCU's RxD pin. Instead it is uses INT1. So this suggests that the serial protocol is probably not common RS-232. Not that ...

mr.rc-cam

I'm interested in it too, but cannot find any information on the communication protocol. viewtopic.php?f=6&t=1794

mr.rc-cam

I am happy with my 450 size DJI clone (with 10x4.7 APC props). It is a very low cost frame so it's not a burden to buy an extra kit to use as spare parts for crash repairs. I have some details on my build posted here: http://www.rc-cam.com/forum/index.php?/ ... og-part-3/

mr.rc-cam

I recently came across the XAircraft Pilot Lamp accessory ($10 LED/Buzzer) and thought it would be an interesting candidate for the MWC. Unfortunately I don't own an XAircraft to reverse engineer and I can't find any communication protocol information on it. Given the simple 3-wire connection, I ass...

mr.rc-cam

Check the GUI's i2C error counter. If it is reporting errors then read this for the hardware fix:
viewtopic.php?f=8&t=986

- Thomas

mr.rc-cam

is my setup the reason that the copter sometimes behaves strange but most of the times is okay!? Incorrectly chosen pullups can cause problems with the model's reliability and performance. We have no idea if this is YOUR issue, but it is certainly high on the list. Is activated internal pullups and...

mr.rc-cam

1. The value of the internal pullups is about 40K ohms. This is far above the ideal i2c values of about 2.2K ohms. From my experience the internal pullups are inadequate for the task and part of the reason for many poor performing MWC installations. 2. The internal pullups are sourced from 5V. Conne...

mr.rc-cam

Check the GUI again, but ignore the graphical image. Watch the raw sensor data instead. Do the raw values work as described in the FAQ? FAQ: TILT the MULTI to the RIGHT (left side up): MAG_ROLL, ACC_ROLL and GYRO_ROLL goes up MAG_Z and ACC_Z goes down TILT the MULTI forward (tail up): MAG_PITCH, ACC...

mr.rc-cam

The bayrc guide I followed, showed that, in addition to the negative leads, the positive leads of all ESCs should also be connected together. I recommend that you only power from one ESC's BEC and disable the other three BECs. Don't cut the wires, just slide out the red wire from each ESC's servo p...

mr.rc-cam

You should state the MWC firmware version you are using too. Another guess is that the cause of the problem are the ESCs. HobbyKing's guys keep telling that the above ESC is not good for multi-rotors, but the multiwii site claims that the SS series can update fast enough. I can't really say. I have ...

mr.rc-cam

Are you sure it's not a "mechanical" issue? For example, prop hub not adequately fixed to motor shaft or frame/motor-arm torquing under high motor speeds?

mr.rc-cam

The MWC code uses CPU hardware interrupts to process the R/C Rx's signals. So there are are no halts, waits, or delays needed between servo pulses.

- Thomas

mr.rc-cam

This fellow's video demonstrates how wiring layout impacts the mag sensor:
http://vimeo.com/29519728

- Thomas

mr.rc-cam

Why do I not need the reset option, like discribed in faq? There have been changes over the last few months that are not mentioned in the FAQ. Starting with V1.9, the D12 power reset has been abandoned. The reset is no longer required because the WMP sensor lock-up problem was solved with code impr...

mr.rc-cam

Hi Thomas. I tried with the display reversed. Not good! The resulting immage is a "white-out" because the "backround" is actually thousands of tiny LED's ! Thanks for trying it out. But no worries; I expect the reverse video will increase the chance of video camera artifacts, so...

mr.rc-cam

It's certainly readable in direct sunlight. I will try it with reversed colours (BLACK characters on WHITE back-round) tomorrow. Thank you, that would be very helpful. If it isn't too much trouble, please try recording the display with your camera again in bright light. The OLED's video artifacts w...

mr.rc-cam

@mr.rc-cam:
I've uploaded a video to Utube: http://youtu.be/dm5RNufNArE

Thank you, I appreciate that.

How's it look in bright outdoor lighting? Does it wash out or is the contrast still acceptable.

- Thomas

mr.rc-cam

Awesome! I'd be interested in using it as a video cockpit in front of my FPV camera. How does its contrast look while outdoors in direct sunlight? Is there any chance you could record an indoor demo video as it prints the text messages? It would be interesting to see if it has scanning artifacts lik...

mr.rc-cam

The reason why the Arduino Pulsin() function is not used can be found in the function's description. pulseIn() Description: Reads a pulse (either HIGH or LOW) on a pin. For example, if value is HIGH, pulseIn() waits for the pin to go HIGH, starts timing, then waits for the pin to go LOW and stops ti...

mr.rc-cam

Specifically, it looks like all one would really need is a MOSFET driver that can handle the proper amperage rating of the motors used. It would be as simple as that if we were using brushed motors. However, there's a lot more going on in a 3-phase brushless ESC and the typical MWC's CPU does not h...

mr.rc-cam

it still has a wobble but not near as bad as before. Something is still not 100% though, it can stay in the air but not useful for fpv or areal video Before you give up I think it would be worth your effort to check/resolve any vibration issues. You can use the GUI's sensor data to see the vibratio...

mr.rc-cam

1. Carefully observe the items installed in the Gyro sensor's proximity. Things like magnets or any metal items are forbidden because they will affect the measured magnetic fields. 2. Repeat the "3D" all-axis Gyro calibration using the GUI button. Slowly rotate the model on all of its axis...

mr.rc-cam

Now it gets weird, for the first 2 weeks I had these esc's they worked fine on both sets of motors, it's as if they have all become damaged at exactly the same time. Any ideas or people with similar problems??? Just had a VERY similar experience that I thought was being caused by my Quad's Proton 1...

mr.rc-cam

Just one question : is it possible that failsafe has a bug and one motor stop when copter runs into it ? It will not help to understand why i run into failsafe but it could explain why one motor stop (and always the same). FWIW, most modern R/C Rx's won't allow the MWC failsafe to activate because ...

mr.rc-cam

No defect connectors/wires.. Plugged in battery after crash.. Everything fires right up... That doesn't mean your wiring is reliable. Intermittent connectors/wiring can make common troubleshooting very difficult. I experienced this first hand, as discussed here: http://www.multiwii.com/forum/viewto...

mr.rc-cam

I said it before and will say it again - never use bullet connectors.

Wise words indeed.

- Thomas

mr.rc-cam

My problem is that suddently one motor stops while in flight mode (not idle). This offcourse results in a crash. I have tried to investigate the problem by holding the quad by hand. When idling there is no problem, but when throtteling up, one motor ususally stops within around 10-40 seconds. Not a...

mr.rc-cam

V1.9 uses hardware based analogWrite() to create most of the PWM signals. The ~490Hz refresh rate is fixed by the Arduino library. Please see the library reference for full details on the analogWrite function.

- Thomas

mr.rc-cam

now the warthox board is mounted on the frame with 2 screws with foam in between but via the 2 screws it is in direct contact with the frame of course which will be of influence. Eliminate the screws. The sensors need good isolation from the frame to damp the motor/prop vibrations. As mentioned, se...

mr.rc-cam

does the Arduino only give the throttlevalues to the esc's or is there a feedback from the esc about the real rpm to the arduino? Reading the actual RPM is not a feature available on common ESC's. The required feedback is from the 3-axis gyros (and optional accelerometers). Are the values shown in ...

mr.rc-cam

I am not sure how to calibrate and program the ESCs, as there no documentation. The throttle range needs to be calibrated in order for the ESC to work in harmony with the MINTHROTTLE setting. You also need to ensure the ESC is programmed correctly or the ESC's low voltage cutoff (LVC) feature may i...

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