ok so we bought the thing, we followed the instructions and double-triple checked, it still doesn't work.
the problem is: it is very unstable, it can't stabilize itself. We try to get off the ground , and within one second of take off, it goes insane, makes a sudden move/ flip... without touching anything but the throttle stick.
We tried to hold it in our hands while running, and it gave us a vague impression that it acts as it is in "+" config, although it is in "x". Also, it seems to try to stabilize in the wrong way: instead of compensating, it reacts exactly opposite, and increases errors.
one other issue: when throttle goes to 0, two motors stop fast, the other 2 take about 2 or 3 more seconds to... could that mean anything? Also, when it is almost taking off, but keeps contact barely, it spins... is that just vibrations, or does it mean anything?
I actually wanted to take a video of it but we ran out of propellers and also a motor mount broke. So a video will be coming shortly (if it helps any). We also have some logs, just say if it can help.
(we are begginers to quadcopters and RC in general, but say we know our way around mechanics and electronics and Arduino...we are students!)
thank you very much,
any help is welcome,
Sure there is:
Swap the "suspect"motor with one that is behaving well. If the problem "follows" the suspect motor, it's a motor problem. If it stays with the ESC, it is an ESC, wiring or other problem.
Then repeat by moving the ESC (one parameter at a time). See if the problem follows the ESC, that means calibration possibly.
Process of elimination by keeping all parameters stable and changing one at a time to see what happens.
a video so you can better see what happens (this doesn't show instability, only motors stopping at different times)
also a log, if someone can make use of it: (don't remember exactly what the log contains, what we did then. If you want something specific, please say so)
Check my response to other query. Basically, the 4-wire connector came connected wrong from DIY. The white wire shoutld be outboard on the upper board connection. I found that switching the connector around so that the white is on the outside, and the inner two wires switched with each other works. Be careful taking it out of the plastic connector. Get someone who knows how to do it!!!