Flight Controller will not ArmLow BatteryCompass & IMU Not CalibratedBad GPS SignalMotors Spinning the Wrong DirectionBrushless AC MotorsBrushed DC MotorsDrone Flips on TakeoffMotors Spinning Incorrect DirectionPropellers Installed IncorrectlyFlight Controller OrientationRadio System FailureRadio AmplifiersPropeller Flies Off in FlightBattery Life is Significantly ShortManufacturer Defective Batteries Various flight controllers will not arm for different reasons. Here are a few problems to look for when diagnosing your flight controller not arming. Ensure the flight battery is fully charged. If your drone has a battery monitoring system, the flight controller may not arm when the flight pack voltage is below a certain threshold. The compass (magnetometer) can fall out of calibration if exposed to strong electromagnetic interference (EMI). Ensure the compass is far from batteries, motors, magnets, and other components which may create EMI. Follow the calibration procedure for your flight controller to ensure your compass and IMU are properly calibrated before flight.

Some flight controllers equipped with GPS will require a good signal before arming to ensure they have a home location to return to in the event of a radio control system loss of signal (LOS). Leave your drone turned on but disarmed for a couple minutes with a clear view of the sky to ensure good GPS signal before flying. Most flight controllers will spin the motors at slow speed when armed, ensure your propellers are spinning the correct direction. To change the direction of rotation for a brushless motor, swap any two wires connecting the motor to the speed controller. This works by changing the order of phasing in the three-phase brushless motors. Alternatively, if your drone uses DC motors (Parrot.AR and some smaller drones), first check that your propellers are installed on the correct motors. These motors are factory installed and are not likely to be spinning the wrong direction. Probably the most common cause of confusion among new pilots who have built their own drone, flipping on takeoff and be easy to fix but hard to diagnose.

This is because there are a few different problems which can cause this to happen. Flight controllers expect each motor to spin either clockwise or counter-clockwise, depending on which spot they are located. Check you flight controller manual or data sheet for motor spin direction notations and make sure your motors are matching what the flight controller is configured for. Propellers should spin in the direction that forces air downward with the concavity of the blade curved down. Check that your propeller is spinning the correct direction and is not installed upside down. Some flight controllers allow you to mount them on their side, at an angle, or on their back. If you have mounted your flight controller in an alternative way, make sure your flight controller knows this by adjusting its configuration accordingly. Antenna placement is key to success for any wireless system. Power, antenna quality and placement, and clear line-of-sight are all important to good signal strength.

Using an amplifier to increase your signal strength can lead to significant distance increase. However, these amplifiers saturate the receiver at close range. With the receiver used to such strong signal, any minor block in line-of-sight can cause the radio connection to fail. As funny as it may sound, this does happen occasionally and can result in significant damage. parrot ar drone recensioniSelf tightening props are available from a few different suppliers are can ensure your propellers never come loose. parrot ar drone datenLoctite Threadlocker can be used on prop securing bolts to prevent them from coming loose during flight.ar drone central cross glue Batteries should be stored at room temperature, in the shade, with low humidity.

High temperatures and humidity can damage the chemistry inside the cells, causing the battery to lose capacity resulting in shorter flight times. Some manufactured batteries may be defective, we've seen this with a few Phantom 2 battery packs. Contact your manufacturer for a replacement if you feel your battery may be defective. Low-level interface for controlling the Parrot AR.If you want to write an external program or library controlling this UAV, look at UAV::Pilot::Control::ARDrone instead. If true, navdata will use a multicast IP connection. Mac OSX seems to be tricky to use with multicast. Initiate the connection to the UAV. Controls takeoff/landing, and also the emergency toggle. Drone shows all red lights and won't respond to commands, send this with the emergency flag to reset it. This can also toggle emergency mode on in case the UAV flys out of control. Controls the roll/pitch/vertical speed/yaw. Sending this once will make the AR.Drone go briefly in that direction and then return to normal.

For constant motion, the AR.Drone developer documents suggest sending the command every 30ms. The roll/pitch/vert_speed/yaw parameters are numbers between -1.0 and 1.0. Note that they will be treated as single-precision (16 bit) floats, as per the developer docs. Same as at_pcmd, but with additional argument for setting the current magneto heading. For $magneto an angle of 0 means facing north, positive value is facing east, and negative is facing west. 1 and -1 are the same orientation. The $magneto_accuracy sets the maximum deviation of where the magnetic heading differs from geomagnetic heading in degrees. Negative values indicate an invalid heading.Drone that it's lying horizontally. It must be called after each startup. This command MUST NOT be sent when the drone is flying. This is automatically called by connect().This command MUST be sent when the AR. The $device parameter should be one of the ARDRONE_CALIBRATION_DEVICE_* constants. This will cause the AR.

Drone to spin around. Set a config option. See the list of config constants. When using multiconfiguration, send this before every at_config() call. A useful but rather under-documented command for initing things like navigation data. Add an object that does the UAV::Pilot::NavCollector role. It will be passed a fresh nav packet each time it comes in. Sends multiple commands in a single packet. Takes a 32-bit, single-precision floating point number. The binary form is then directly converted into an integer. For example, 0.5 converts into 1056964608. The protocol requires floating point numbers to be transferred this way in some cases. The API will take care of most of these cases for you, but there are some configuration settings that you'll have to convert yourself (like LED animations). Fetch and parse the latest nav packet off the nav socket. Returns true if there was a new nav packet to read, false otherwise. You can get the last available nav packet by calling last_nav_packet().