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** heads-up display, able to fly it from a first-person perspective? | ** heads-up display, able to fly it from a first-person perspective? | ||
* runs Linux? | * runs Linux? | ||
− | ** | + | ** [http://www.embeddedarm.com/products/board-detail.php?product=TS-7500 TS-7500]: 67mm x 75mm; 400mA @ 5V; runs Linux. |
** gumstix: runs Linux | ** gumstix: runs Linux | ||
* able to lift a 1 Kg payload? | * able to lift a 1 Kg payload? | ||
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* Would it help to pan/tilt the camera on an independent gimbal auto-stabilized camera mount gimbal?[http://diydrones.com/profiles/blog/show?id=705844%3ABlogPost%3A2525] | * Would it help to pan/tilt the camera on an independent gimbal auto-stabilized camera mount gimbal?[http://diydrones.com/profiles/blog/show?id=705844%3ABlogPost%3A2525] | ||
* automatic docking station for battery recharge?(perhaps similar to the one Professor Jonathan How uses?) | * automatic docking station for battery recharge?(perhaps similar to the one Professor Jonathan How uses?) | ||
− | * can be dressed as an ominous-looking hovering black sphere? | + | * can be dressed as an ominous-looking hovering black sphere? |
* can be dressed up as an Imperial probe droid? | * can be dressed up as an Imperial probe droid? | ||
* runs image-recognition software on-board? | * runs image-recognition software on-board? | ||
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* the NG Multikopter Project wiki [http://ng.uavp.ch/moin]: a open source community project to build a modern autonomously flying Multicopter. | * the NG Multikopter Project wiki [http://ng.uavp.ch/moin]: a open source community project to build a modern autonomously flying Multicopter. | ||
* ArduPilot [http://www.diydrones.com/profiles/blogs/ardupilot-main-page] is a full-featured autopilot based on the Arduino open-source hardware platform. It uses infrared (thermopile) sensors or an IMU for stabilization and GPS for navigation. Optionally uses XBee modules for wireless telemetry. Jose Julio at DIY Drones [http://www.diydrones.com/profiles/blog/list?user=3n7oxlg4fanvy] uses it in his two quadcopters. He uses 4 standard props (No counter-rotating !). | * ArduPilot [http://www.diydrones.com/profiles/blogs/ardupilot-main-page] is a full-featured autopilot based on the Arduino open-source hardware platform. It uses infrared (thermopile) sensors or an IMU for stabilization and GPS for navigation. Optionally uses XBee modules for wireless telemetry. Jose Julio at DIY Drones [http://www.diydrones.com/profiles/blog/list?user=3n7oxlg4fanvy] uses it in his two quadcopters. He uses 4 standard props (No counter-rotating !). | ||
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== testing == | == testing == | ||
DIYdrones recommends following the | DIYdrones recommends following the | ||
− | The Remote Control Aerial Photography Association | + | The Remote Control Aerial Photography Association [http://www.rcapa.net/guidelines.htm guidelines]. |
== BLDC == | == BLDC == | ||
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It appears that most modern small electric aircraft use so-called "brushless DC motors", each one driven by its own "BLDC ESC". (These are easily recognized -- BLDC motors have exactly 3 equally-fat wires that go into them, which come from the BLDC ESC -- as opposed to most electric aircraft a few years ago, which used brushed DC motors with exactly 2 equally-fat wires). | It appears that most modern small electric aircraft use so-called "brushless DC motors", each one driven by its own "BLDC ESC". (These are easily recognized -- BLDC motors have exactly 3 equally-fat wires that go into them, which come from the BLDC ESC -- as opposed to most electric aircraft a few years ago, which used brushed DC motors with exactly 2 equally-fat wires). | ||
− | + | While it is probably not cost-effective to build your own BLDC motor or BLDC ESC, many of us are insatiably curious about what goes on inside these things, and so build one anyway: | |
+ | * [http://en.wikipedia.org/wiki/brushless_DC_electric_motor Wikipedia: brushless DC electric motor] | ||
+ | * [http://www.atmel.com/dyn/resources/prod_documents/doc8012.pdf Atmel AVR444: Sensorless control of 3-phase brushless DC motors] using ATmega48 (also works without change for ATmega88 and ATmega168). Assumes you've already read [http://www.atmel.com/dyn/resources/prod_documents/doc2596.pdf Atmel AVR443: Sensor-based control of three phase Brushless DC motor] | ||
+ | * [http://www.atmel.com/dyn/resources/prod_documents/doc8138.pdf AVR194: Brushless DC Motor Control using ATmega32M1]: BLDC motor control application using Hall effect position sensors to control commutation sequence. | ||
+ | * [http://www.mikrokopter.de/ucwiki/BrushlessCtrl MikroKopter: brushless motor controller] was designed to give lower latency than off-the-shelf PWM ESCs. | ||
+ | * [http://www.openservo.com/forums/viewtopic.php?t=972 OpenServo: Brushless DC Servo] "The thing that will make our board different from other ESC's is that we are closing the feedback loop with a ... outside position reference." | ||
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== unnecessarily complicated equations == | == unnecessarily complicated equations == | ||
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To double thrust requires either pulling almost 3 times as much power from the batteries, or using rotors with almost 3 times the diameter. | To double thrust requires either pulling almost 3 times as much power from the batteries, or using rotors with almost 3 times the diameter. | ||
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== unsorted == | == unsorted == | ||
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* ARM-o-Kopter wiki [http://www.armokopter.at/] | * ARM-o-Kopter wiki [http://www.armokopter.at/] | ||
* comparing some currently known projects of airborne non-commercial or open community projects of multicopters[http://ng.uavp.ch/moin/Comparison] | * comparing some currently known projects of airborne non-commercial or open community projects of multicopters[http://ng.uavp.ch/moin/Comparison] | ||
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* DIYdrones: "There are a zillion quad- and tri-copters out there" [http://diydrones.com/profiles/blogs/all-things-quad-megalist] | * DIYdrones: "There are a zillion quad- and tri-copters out there" [http://diydrones.com/profiles/blogs/all-things-quad-megalist] | ||
* DIYdrones: Quadcopters discussion forum [http://diydrones.com/forum/categories/quadcopters-1/listForCategory] | * DIYdrones: Quadcopters discussion forum [http://diydrones.com/forum/categories/quadcopters-1/listForCategory] | ||
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** the Quadrotto Project[http://sied.dis.uniroma1.it/quadrotto/] | ** the Quadrotto Project[http://sied.dis.uniroma1.it/quadrotto/] | ||
** Project Quadcopter: "try make ... decent explanation of the Kalman filter for non-mathematicians" [http://quadcopter.wordpress.com/2010/04/28/not-taking-a-break/] | ** Project Quadcopter: "try make ... decent explanation of the Kalman filter for non-mathematicians" [http://quadcopter.wordpress.com/2010/04/28/not-taking-a-break/] | ||
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* RCgroups: Multi Rotor Helis discussion forum [http://www.rcgroups.com/multi-rotor-helis-659/] | * RCgroups: Multi Rotor Helis discussion forum [http://www.rcgroups.com/multi-rotor-helis-659/] | ||
** RCgroups: [http://www.rcgroups.com/forums/showthread.php?t=768115 "A New 1000mm Quad Copter Design"] 2007 | ** RCgroups: [http://www.rcgroups.com/forums/showthread.php?t=768115 "A New 1000mm Quad Copter Design"] 2007 | ||
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* [http://www.diydrones.com/photo/arduimu-quadcopter-4? "ArduIMU Quadcopter 4"] by Jose Julio 2010 | * [http://www.diydrones.com/photo/arduimu-quadcopter-4? "ArduIMU Quadcopter 4"] by Jose Julio 2010 | ||
* [http://reprap.org/wiki/RepCopter RepRap wiki: "RepCopter"]: early stages of a project to design a quadcopter frame that can be printed on a [[RepRap]] plastic extruder. | * [http://reprap.org/wiki/RepCopter RepRap wiki: "RepCopter"]: early stages of a project to design a quadcopter frame that can be printed on a [[RepRap]] plastic extruder. | ||
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