he needs MORE reading… !
Sir while using my pixhawk 2.4.8 I am getting error msg that CHECK BRD_TYPE : BARO:UNABLE TO INITIALIZE DRIVER. What problem it could and how to remove that. Just fyi I was using this board nicely daily and today I just change the telemetry. No change apart from this.
PixRacer?
Did you connect something to TELEM2?
no… i will explain entire scenario. I made a sortie with my quad and then land. then next morning i connected a new telemetry to the quad by removing the existing one. then i was uploading the firmware in the pixhawk. After that it stop working and firmware is not getting upload. i am getting the error “check BRD_TYPE: BARO: unable initialise driver” with ardu copter. but the error was different when i was uploading the arduplane in the same pixhawk. but now i am not able to use it. Is it the hardware issue of driver issue ?
sir i am sharing a flight log for my last fight of hexa. During flight, i have observed that my hexa is oscillating too much on pitch axis. Even after some time i lost the control and hexa just flipped upside down. The same behavior observed three time whenever i tried to lift the copter up. please help me to find th difficulty. Here is the log of one of the flight.
https://drive.google.com/open?id=1lg6nOOV5n-kxOMzC9Miz6-pLGfUTZIvy
can you comment something about the VCC status in my flight log ? what does it mean and how this problem can be solved ?
https://drive.google.com/open?id=1Qm-BwtVH8sMRpzl4YMqFnKZliVMWVxES
hi amilcarlus,
i have a doubt about the vehicle performance. what will happen if i use a overpowered quad copter in auto mode (alt hold, pos hold) and in manual mode (stabilize and acro) ? How does it behaves ?An overpowered system will perform good if you tune the PID values.
Start by reading http://ardupilot.org/copter/docs/tuning.html
you can find even more information by googleing for “arducopter PID tune”
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Hello Sir,
i have an doubt that what will happen (performance wise) to my quad copter if i hover on 50 % of throttle and in another case 76% of throttle ? If there will be any deterioration then what is the logic behind that ?
50% throttle in hover means that the motors have plenty of headroom in both directions. They have a 50% margin up and 50% margin down. The controller has therefor the freedom to use all that range when controlling the vehicle.
76% throttle in hover means that the motors have 24% headroom up, and 76% margin down.
The controller has therefor less freedom (the motors saturate at 100%)
I suggest you pick up a control theory book and read about controller/actuator saturation for more info.
It might also be that in your particular case 24% headroom is still enough and that the system remains stable and responsive!!
TestRollPitch coupling does not recognize the new BRAKE mode. Needs to be added probably.
Hi,
I am sharing four different logs of my quadcopter. These all four logs are associated with the same vehicle configuration with same payload.
https://drive.google.com/open?id=1467_t1usFxhYoVR191cW8VjF2AiIjjom
https://drive.google.com/open?id=1WBBo5_Ex03RAxdOjouR6uzO9nWr1byMw
https://drive.google.com/open?id=1ZZBUJdx0ielAyKHs9S-yBr2idkxVnxD3
https://drive.google.com/open?id=1Qer8iV9r_wdy0udZJCuYdgxQyiFS_4Vo
What i have observed that for the same vehicle and same payload my motor’s balancing start deteriorating. First two log associated with the flight on 12th balancing was good, but on 13th it become worst and during second attempt made on 13th at 11:14 AM, it just crashed with very random behavior. The odd behavior observed was the undesired roll in the system during the take off and during the flight too. Though the last log will tell that there i s a GPS glitch but situation was not good even before the glitch. Why this odd behavior came into the system, while i did not change anything in the system ? Please help in finding that.
I looked in the last log.
As mentioned previously your Vcc (5 volts supply to the flight controller) is going dangerously low and also generally following your battery voltage down over time, indicating it’s a very poor voltage regulator.
You need around 5.2 volts or 5.3 volts and very steady, regardless of battery voltage.
Having said that, Vcc is probably not the cause of the issues, but certainly something to fix before it is the cause.
Your battery voltage is getting low too. And according to logs you’re using 120 amps to stay airborne!
So either the current sensor is not calibrated properly, or this is some heavy quad with massive motors and props. You’ve got BATT_AMP_PERVOLT 39.877 - this will depend on your current sensor, but I’ve got 15.252 for a relatively standard power board on a 3cell lipo.
What’s the all up takeoff weight? What motors and props do you have?
In the logs, Yaw and Desired Yaw look OK. Pitch and Roll is the problem - Desired Pitch and Pitch depart, and Desired Roll and Roll depart. They’d normally track very close to each other.
Motors 1 and 2 are running near maximum just to stay airborne, motors 3 and 4 are running closer to mid range. Ultimately, whenever the flight controller tries to make corrections 1 or more outputs are going to minimum and 1 or more going to maximum, and there’s no more throttle available (either up or down) to maintain stability.
There’s a weight distribution problem too, please get it better balanced.
Please provide more motor, prop and weight details, even a photo.
Edit: I wouldn’t worry too much about the GPS glitch yet, it’s probably not the cause of the issues and more likely is a symptom of the craft being unstable.
My motors are : Turnigy MN-3510 , of 650 KV, 14" props, on a quad. My lift-off weight was 4.5 kg.
The nearest motors I can find to that is Quanum MT-3510 630KV.
I took a guess at your ESC’s, prop pitch, frame size, and battery (assuming the voltage sensor is reasonably calibrated) at 4 cell lipo…
Plugging a few ballpark figures in eCalc:
I’d say you’ve got a low thrust to weight ratio, about 1.4:1 , you want about 2:1.
Hover throttle is going to be 65% to 70%+ and probably deteriorate as motors and ESC’s heat up, you want around 50%.
Motors are going to draw about 15 amps each at hover, 107 amps total for maximum power. You’d need a good Mauch power module to handle that current I’d say and some other good quality power distribution parts.
Assuming your value of 10000 mAhr in parameters is correct, you’d get about 6 minutes to 9 minutes fly time.
Get a subscription to eCalc https://www.ecalc.ch and spend a few days or more finding a good combination of prop and motor to suit your frame and weight.
I tried a few different options, and I think honestly you’ll really struggle with that weight on a quadcopter. You’ll need to go to 6 cell and 15inch props at least, and expensive motors.
A hexacopter would be a better proposition if the wieght cant be changed.
Yes,sir. i am hovering at almost 70 % of throttle. Motors are getting hot such that we can not touch it even for two second.
hello sir,
i used the same setup now. with the motors and pros as discussed previously. This time my total lift off weight was under 3000 gm but still i am getting status as motor balance fail/warn. Now even with the very much lower weight then how the motors are unbalanced ?
Before flight i ensured that C.G. was at the center and below the propeller plane. I am attaching a flight log associated with the flight of the same setup.
https://drive.google.com/open?id=1UjcUl2jcfxsElbfHgpP_EoEHvmG62Dg1
https://drive.google.com/open?id=1ZL983qCMg069eM1I8fZBhnAoNj3UhASe
https://drive.google.com/open?id=1JdRCAp_NSoCRc2WjKC71eF4uLo0olkCp