Hi
So we've had our CrazyFlie 2 for a while but only just decided to try to get it to work "properly". We've had some previous half-hearted attempts, but were unable to fly it, and put this down to our lack of previous drone-flying experience.
But having read some comments here about how stable this drone is supposed to be, I'm starting to think there's something wrong with ours. A couple of things. First, the Yaw reading on the client app is ever-decreasing or increasing, even with the drone just sitting on a flat table, at about 0.2 per second. Second, we need a huge pitch trim (20) to stop it darting backwards on take-off. Third, even with that huge pitch trim, it seems to be quite random in its "flight", with no controller input other than thrust, using either the python client app or the ios app, and getting it above knee level, it hardly ever goes straight up. It rather more randomly goes left or most often backwards. It's unpredictable, at best.
It seems slightly more stable with the ios app but this is not based on a large enough sample flights to be certain about.
It has the latest (16/02) firmware.
And it has always behaved in a similar unpredictable way.
If I hold the drone and tilt it, the artificial horizon the app seems to change as I would expect. The drone passes self-test. We have used a small cable tie to securely fasten the battery in place, it can't shift around.
Not sure what other information to add.
We're pretty disappointed at this point, this was a fairly expensive first foray into drones. I'm hoping we can get this sorted out.
Unstable CrazyFlie 2, odd yaw also
Re: Unstable CrazyFlie 2, odd yaw also
Welcome to the forum IanB!
I'm sorry to hear about your bad experience. We will do our best to help you out!
It is very hard to tell if there might be a sensor problem or not but the things you are describing could also be tuning problems. As for the yaw, the drifting is a normal behavior because it is not possible to use gravity to "calibrate" it.
As for having to trim pitch a lot this can be a center of gravity problem or a motor problem as well. My initial guess is a center of gravity problem. Move the battery forward or backward to fix this. You can hold the CF2 between your fingertips in the two "ears" to help find it.
Then a simple test to do to check the motors and center of gravity is to do a short thrust burst to "shoot" it up about 0.5m-1m an check that it goes straight up. If not there is a high probability of a motor problem or a center of weight problem.
I'm sorry to hear about your bad experience. We will do our best to help you out!
It is very hard to tell if there might be a sensor problem or not but the things you are describing could also be tuning problems. As for the yaw, the drifting is a normal behavior because it is not possible to use gravity to "calibrate" it.
As for having to trim pitch a lot this can be a center of gravity problem or a motor problem as well. My initial guess is a center of gravity problem. Move the battery forward or backward to fix this. You can hold the CF2 between your fingertips in the two "ears" to help find it.
Then a simple test to do to check the motors and center of gravity is to do a short thrust burst to "shoot" it up about 0.5m-1m an check that it goes straight up. If not there is a high probability of a motor problem or a center of weight problem.