book

Make: Drones

by David McGriffy

October 2016

Intermediate to advanced

222 pages

5h 26m

English

Make: Community

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SuccessSmall, Medium, LargeConventions Used in This BookUsing Code ExamplesSafari® Books OnlineHow to Contact Us
MotorsBatteriesControl Systems
MultiWiiDronecodeAPM/ArduPilotPX4/PixhawkDJI/NazaKK2CC3D/OpenPilotNaze32/Baseflight/CleanflightChoosing a Flight Control System
Aerial PhotographyFPV RacingEducationFlying
Goals and Test MethodsBattery UpgradeProp Upgrade
PartsBuildFlashing New CodeWiringAssemblySetup and TuningRC RatesPIDsModes
A Teensy CPURadiosIMU/AHRSPowerCircuit Board with Motor ControllersFrame/Motors/PropsWeight Budget
Setting Up the IDEMain LoopRC ReceiverBluetoothMotors
Lift and ThrustPitch and RollYawTranslational LiftVortex Ring State
GyrosAccelerometersIMUMagnetometers

ModeAngle ModeRate ModeMix
The AlgorithmP—ProportionalI—IntegralD—DerivativeImplementationTuningTheoryPractice
Design Tools and FilesComponent PlacementPower Input and DistributionMotor ControllerSchematic and LayoutConstruction
Install the Controller and Connect the LEDsConnect the MotorsInstall the RadiosComplete the FrameGround TestFlight Test and Future Work
The S500 KitFollow the Instructions
Mount the ESCsWire the Power Distribution BoardMount the MotorsDetermine Direction
Brushless MotorsESCsBECs
Pixhawk Lite and Shock MountRC RadiosTelemetry RadioSafety SwitchTesting
HistoryTheoryHDOPInstallation
The Earth’s Magnetic FieldDeclination and DeviationMagnetoresistanceUse in Drones
Install the PropsConnect the Battery and Voltage MonitorRadio and Accelerometer CalibrationFlight ModesInitial TuningFinal Checklist and First Flight
SonarLidarOptical Flow SensorsVisual Odometry
Causes of VibrationEffects of VibrationDamping and IsolationProp Balancing
FailsafesRedundancy
Computer InterfacesRC Radio StandardsDSM/DSM2/DSMXFrSkyServo/ESC ControlTelemetryGPS
SpecializationRegulationEase of UseSafetyHuman Flight

Content preview from Make: Drones

Chapter 22. Vibration

If you read drone forums for long, you will inevitably run across a discussion of vibration. I have had several hard crashes I believe were caused by vibration, so I have a very personal interest in the subject.

Vibration matters to anyone who flies a multirotor aircraft. We all use inertial stabilization systems, gyros and accelerometers, and these are very sensitive to vibration. Aerial photography depends on having a stable platform from which to shoot. And in the end, bad vibrations can simply shake a drone apart.

Figure 22-1 shows the log from a test when my drone was suffering from some devastating vibrations. It shows forces in the range of three to five times the force of gravity (that is, 3–5G). A reasonable reading ...