[notice class="attention"]Before following this tutorial make sure your transmitter is properly trimmed out using normal (Gyro/Acro) flight mode and adjusting the trim dials on your transmitter. Without properly trimming your transmitter to neutral your transmitter will be commanding the quadcopter to move when you intention is for the copter to maintain a level attitude.[/notice]
[emphasis]Attitude -[/emphasis] The angle of the aircraft in both the roll and pitch axis with respect to the earth, it's orientation.
The Quadrino contains an accelerometer sensor which the copter can use to maintain a level attitude. This means without any stick input, and without wind, the copter will stay perfectly still in the air. Auto-level is not position hold, if there is wind it will still blow the copter away. However, even in wind the copter will continue to maintain a level attitude and will not flip or otherwise blow over at an angle. (Imagine the behavior of a hovercraft floating on a pillow of air.) You can still fly around in auto-level mode as the amount of roll or pitch stick input will slant the copter's attitude accordingly and maintain it for as long as you maintain that amount of stick input. Release the stick and the copter will return back to level flight. This is in contrast to gryo/acro flight mode where a neutral stick will try to stabalize the copter's current attitude, but will not return to level position.
So if you roll to a 45° bank, it tries to keep that 45° bank until you anti-roll back to level. You have to make sure your transmitter is trimmed properly so that when you have no stick input the copter maintains the attitude. This is called acro mode (normal/default flight mode). To trim, take off in acro mode, try to maintain level. Determine where you had to keep the roll/pitch stick to stay level. Then land, adjust your transmitter to fit. Then take off and try again. You should be able to level the copter, then let the roll/pitch stick go and the copter should stay level really well (if it’s not windy). Wind will always change the copter's position, there is no fixing that without GPS.
Before following the steps in this tutorial you should have already done the following:
Auto-level flight requires a properly calibrated accellerometer. The Quadrino's accellerometer is calibrated at the factory but you can also repeat the calibration process in the MultiWii GUI. In any case, a desk or a floor is not perfectly level so some adjustment of this calibration will have to be done in-flight. There is a method to tuning the accellerometer (auto-level) in the field. This must be done after trimming the transmitter though otherwise you are just trying to correct one error with another. So with acc pre-calibrated and your transmitter already trimmed previously in gyro/acro mode do the following: