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Unmanned Helicopter Programming

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Submitted By m1shermans
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AbstractA thermopile is a horizon sensor that works by detecting thermal infrared radiation, or radiated heat. Several autopilots and FPV (First Person View) -assist systems have been based on this type of sensor, as it is practical for a fixed-wing plane without using GPS or expensive drift-prone IMUs (Inertial Measurement Units). They range from sophisticated surveillance drones that detect threats in an environment, to backyard remote helicopters for recreation and practice. The basic design for any remote vehicle includes the guidance systems, power source, control systems, flight surfaces, and if needed, an autopilot program. I intend to learn more about designing and fabricating remote helicopter so that I may design and fabricate my own radio controlled helicopter. The most common power source of radio control helicopters are Lithium Polymer batteries. A thermopile is a horizon sensor that works by detecting thermal infrared radiation, or radiated heat. First Person View (FPV), also known as Remote Person View (RPV) or Video Piloting, is a method used to control a radio controlled model vehicle from the driver or pilot's view point. Digital servos are more effective but use more power in their outputs. The main difference is that digital servos use electronic circuits to utilize more power for greater control. The key to any radio control helicopter is a dedicated autopilot system. An innovative do-it-yourself autopilot is the Arduino Uno autopilot, to which you can build circuits, programs, etc. to perform certain actions and tasks.IntroductionUAV’s, or unmanned aerial vehicles, are the ultimate form of remote control vehicles. They range from sophisticated surveillance drones that detect threats in an environment, to backyard remote helicopters for recreation and practice. The basic design for any remote vehicle includes the guidance systems, power source, control systems, flight surfaces, and if needed, an autopilot program. Remote helicopters are the simplest to manufacture, and provide the greatest amount of stability. As I am a novice to remote vehicle technology, I intend to use information I have gathered on them, to design and fabricate my own remote helicopter.Background InformationMost remote helicopters use Lithium Polymer batteries as their power source. Also known as Li-Po batteries, the electrolyte in a Li-Po battery is a polymerized form of lithium. One Li-Po cell has a nominal voltage of 3.7V, which is how much voltage the cell is expected to discharge. Li-Po batteries are ideal for remote helicopters because they provide high output for relatively little weight. Li-Po batteries are relatively expensive, and must be stored in a relatively cool environment (32°F or 0°C) and at 40% charge.A thermopile is a horizon sensor that works by detecting thermal infrared radiation, or radiated heat. Blue/black skies do not emit or reflect much heat, while the ground absorbs most of the Sun's visible-light radiation, and emits that energy as thermal infrared. This difference allows a high-flying sensor that is not pointed directly up or down to detect the horizon, where the "cold" sky changes to the "hot" ground. Several autopilots and FPV-assist systems have been based on this type of sensor, as it is practical for a fixed-wing plane without using GPS or expensive/drift-prone IMU’s (inertial measurement units). A servo is an important part of a remote helicopter that is essentially a small motor that is coupled with electronics that monitor the position and orientation of the remote vehicle to allow for remote control of the vehicles. In a standard remote-control system, the servos are connected to the receiver and to the control surfaces of the vehicle, and receive signals from a controller.Digital servos are more effective but use more power in their outputs. The main difference is that digital servos use electronic circuits to utilize more power for greater control. Digital servos can make tighter adjustments to the control surfaces of the drone with the extra power they can deliver.The key to any radio control helicopter is a dedicated autopilot system. An innovative do-it-yourself autopilot is the Arduino Uno autopilot, to which you can build circuits, programs, etc. to perform certain actions and tasks. The Uno kit comes with its board, a solder-less breadboard, wires, resistors, LED’s, and other components. Arduino can also support external attachments, called shields, which allow you to program Arduino to interact with a broad band of different systems, from wireless Ethernet connections to electric motors. Statement of the ProblemMy goal is to understand the process of transmitting code from a program to a radio-controller in order send flight instructions to a small unmanned helicopter. Methodology and Criteria The small helicopter should be able to navigate a pre-designed course that includes horizontal and vertical obstacles that present some challenges for the helicopter. The helicopter should be able to accomplish this autonomously, without any further input from the controller or human influence. BibliographyWorks Cited “Arduino.” Wikipedia. N.p., 7 May 2011. Web. 7 May 2011. .“Arduino: Adafruit Industries.” Advertisement. Adafruit Industries. N.p., n.d. Web. 7 May 2011. .“Arduino playground.” Arduino. N.p., n.d. Web. 7 May 2011. .“Arduino Tutorial.” limor. Limor Fried, 26 Apr. 2011. Web. 7 May 2011. .Cuartielles, David, et al. “Adruino-Tutorial.” Arduino. Arduino, 3 May 2011. Web. 7 May 2011. .DIY Drones. Chris Anderson’s, n.d. Web. 7 May 2011. .“Fixed - RC Wiki.” RC Wiki. N.p., n.d. Web. 7 May 2011. .“How does it work?” Advertisement. A.R.Drone Parrot. Parrot, n.d. Web. 7 May 2011. .“Unmanned aerial vehicle.” Wikipedia. N.p., n.d. Web. 7 May 2011. .Wiki page. RC Helicopter Wiki. N.p., n.d. Web. 7 May 2011. .

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