This page gives an overview about the required components and lists advantages and disadvantages for each of them.
Also included must be:
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Frame
DJI FlameWheel F450
- Cost: 169€
- Size: 450mm Diagonal
- Weight frame alone: 282g
- Takeoff Weight: 800g-1200g (1600g? Depending on sources)
- Will need cable ties
- Power distribution board already built in
- Propellers included
Microcontroller
Raspberry Pi 2 Model B:
- a lot of existing projects and help
- only 40 GPIO Pins
- extension-board available (http://www.gertbot.com/) for real-time tasks and controlling of actors and sensors (easy to use with existing libraries)
- Price: Farnell £40.00
- size: width:130mm, height:15mm, depth:80mm
- weight: 0.25 kg
weight: 59g
size: heigth: 85 mm, width: 56 mm, depth: 17 mm
power consumption: http://raspi.tv/2015/raspberry-pi2-power-and-performance-measurement
Hardware:
- Prozessor: ARM710 with 900MHz
- RAM: 1024 MB
price:
Reichelt: 37,95 €
BeagleBone Black
In contrast to Raspberry Pi :
- better I/O capabilities with 7 channel 200kHz 12-bit ADC, 8 PWMs, 4 UARTs, quadrature encoder hardware
- don't have to buy additional components to connect up many more sensors and actuators
- large number of PWM channels on the Bones make them better for motors
- better real-time control with two 200MHz, 32-bit RISC programmable real-time units (PRUs)
- approximately 20 books available for texts, reference and projects
weight: 39.68 grams
size: heigth: 86 mm, width: 53 mm
power consumption: http://www.farnell.com/datasheets/1819364.pdf?COM=DesignCenter in section 6.1.7
Hardware:
Processor: AM335x 1GHz ARM® Cortex-A8
512MB DDR3 RAM
4GB 8-bit eMMC on-board flash storage
3D graphics accelerator
NEON floating-point accelerator
2x PRU 32-bit microcontrollers
Price:
Farnell element14: €46.16 (Price is before tax)
RS Components: £39.99
Battery
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LiPo-Warners
Cost: 5-10€
Connection to the microcontroller will have to be done by ourselves. So I don't know how many pins we might need. Will have to talk to someone who might know more, internet doesn't really give much insight. Maybe I'll make a post about it somewhere?
Motors
DJI Motor 2212/920 rpm/V
- Voltage: 11,1 bis 14,4V
- Standard Current: 15-25A
- Max Current: 30A
- Required Batteries: 3S-4S LiPos
- Weight: 56g each (including Propeller Adapter)
Calculation Site: http://www.ecalc.ch/xcoptercalc.php?ecalc&lang=de
In case this helps anyone...I don't think my calculations were correct so it didn't help me much
Electronic Speed Controller (ESC)
DJI Brushless Regler 30A OPTO (?)
- Voltage: 6-16.8V
- Connects to a receiver -> Might need to reverse engineer that thing or the cable, don't know much about that
- Orange Cable carries signal: freq. 30hz-450hz (most people i've seen used 400hz)
- Brown Cable is ground, red one useless apparently
http://wiki.dji.com/en/index.php/ESC
http://www.sarkanyellato.hu/wp-content/uploads/2011/10/RC-Timer-10.18.30.40A-ESC-Instruction.pdf
Replacement parts for Controller/Arms: https://copterdeluxe.com/Multi-Rotor-Copter-Ersatzteile-DJI-Hobby-F450 (Currently not available?)
Gyro & Acceleration Sensors
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Proximity Sensors
4-Pin Ultrasonic-Module HC-SR04
Links: Amazon, datasheet, short instructions
Cost: 10 x approx. 2€ ≈ 20€
Power Supply: +5VDV, 10 x 15mA working current
Pins: 2 GPIO, VCC, GND
- VCC = +5VDC (GPIO)
- Trig = Trigger input of Sensor (5V Digital GPIO)
- Echo = Echo output of Sensor (5V Digital GPIO)
Important: Outputs 5V. If the microcontroller can only handle 3.3V inputs, we need to build an easy voltage divider. - GND = GND (GPIO)
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Minimum sensor recognition distance:> Sensor’s minimum-distance does not have to be much smaller than 20cm (8“). Infrared:
Pro: - Quality products comparatively cheap - In some cases very high resolution (up to 1 mm) Contra: - Problems with sun light - Problems with recognition of dark or black objects - Small range sizes
Recommendation after some research: Sharp GP2Y 0A02 (ca. $11, 20cm – 150cm Range, Analogue Output) http://acroname.com/products/SHARP-GP2Y0A02YK0F-IR-PACKAGE (see also: http://acroname.com/articles/sharp-infrared-ranger-comparison for comparison)
UltrasonicPro: - Not depending on optical properties of an object -> more reliable in common usage - Larger range sizes Contra: - Usually higher prize - Lower resolution (2-3 cm) - Problems detecting acoustic quieting objects
Recommendation after some research: Parallax PING Ultrasonic Sensor (ca. $29, 2cm – 300cm Range) https://www.parallax.com/product/28015 (maybe cheap replacement: http://www.dx.com/p/hc-sr04-ultrasonic-sensor-distance-measuring-module-133696?Utm_rid=37202148&Utm_source=affiliate#.VTsyqa3tmko) |
Radio Telemetry Kit
Aukru HC-06 Wireless 4 Pins Bluetooth RF Transceiver Serial Module
Links: Amazon, instructions, instructions, instructions
Cost: 9€
Power Supply: 3.3V - 6V, approx. 50mA
Pins: 2 GPIO, VCC, GND
- VCC = +3.3VDC / +5VDC (GPIO)
- TXD = Trigger input of Sensor (RXD Digital 0)
- RXD = Echo output of Sensor (TXD Digital 1)
- GND = GND (GPIO)
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FPV 433Mhz Radio Telemetry Kit 100mW V1.1:http://www.hobbyking.com/hobbyking/store/__42847__FPV_433Mhz_Radio_Telemetry_Kit_100mW_V1_1.html |