hi folks,
the idea its great to construct a propellerQuadCopter,
i lives in switzerland, and in the next times i make the first step for this project.
and follow your threads
thanks a lot
regards nomad
To be honest I'm a little bit worried about the measured 325g thrust with my GWS HD8040 (8" triblade props) it will be definitely higher with the 9" props .... anyway it is OK for now. Hopefully my quad will be under 1Kg
To be honest I'm a little bit worried about the measured 325g thrust with my GWS HD8040 (8" triblade props) it will be definitely higher with the 9" props .... anyway it is OK for now. Hopefully my quad will be under 1Kg
How did you measure the thrust? Because reversing two phases and let the prop press the motor downwards onto the balance will not give you the same amount of thrust when the props is pulling the motor upwards. (Unless you also mounted the blades upside down )
Rule of thumb is that you must at least be able to lift twice the weight of the quadcopter. When at exactly the thrust equal to the weight, the quadcopter will not take off.
I have to say I like your frame, looks very stable and hopefully resonance-free :smilewinkgrin:
:-) have you seen the minus in front of the number??? actually it is pulling upwards :smilewinkgrin:
with the bigger blades I should reach around 400-450g and that will be enough to lift up the quad.
Even now with this thrust I can lift up easily, but there are many more thing to be added like bat, and electronics which hopefully will not exceed 750g-1Kg including the frame.
How did you measure the thrust? Because reversing two phases and let the prop press the motor downwards onto the balance will not give you the same amount of thrust when the props is pulling the motor upwards. (Unless you also mounted the blades upside down )
Rule of thumb is that you must at least be able to lift twice the weight of the quadcopter. When at exactly the thrust equal to the weight, the quadcopter will not take off.
I have to say I like your frame, looks very stable and hopefully resonance-free :smilewinkgrin:
No I didn't notice the minus
Then everything should work fine indeed
Wish my scale had that option, mine stops at 0...
I roughly calculated my max thrust and came to a total of 40 N, which is pretty accurate for my current set up.
(I got 4 Hextronik 750kv motors each capable of delivering a thrust of 1.0 kg, and my total weight is 1,5 kg.)
I'm working on the implementation of the Kalman filters right now and after that hopefully a successful testflight
Plug your numbers in to the right places, set the battery and prop types, and it does a fairly accurate job of calculating the thrust and battery draw of a given power setup.
I have just received details of a new chip from Invensence, It is a 3 axis accelerometer and 3 axis gyro with integral processor and I2C interface to connect to a slave digital compass.
Unfortunately not scheduled until Q2 next year. However this will make a nice addition when it comes.
By IanJ1965 | 11 Oct 2010 Part of The Hardware Zone.
Home built joystick type radio control transmitter based on Arduino Prize winner in Competition "Hardware and Device Programming Competition" (First Prize level)
Introduction
Traditionally, RC plane/heli/quadcopter pilots use a dual thumb stick type transmitter, however and especially quadcopter pilots, it's not a very intuitive way to fly especially for the beginner.
We've all seen the movies and at least have a vague idea that a pilot of a real aircraft/spaceship uses a joystick. So why not with RC aircraft.
The basic idea of my project was to implement a joystick solution in the easiest way possible, but one that fulfills my exact requirements.
SSM and chickenblender have Quad and Tri copters respectively which do not use any micros (as such). The use off the shelf HK401B gyros from hobbyking.com and chickenblender uses vtail mixers and FMA Copilot too whereas SSM uses the 4x mixers in his transmitter. This is an extremely simple solution without micros. I think a prop with a gyro could do the simple mixing easily.
I know Jason has more complex code running. But this could be a simple start.
What I am doing is receiving the rc servo outputs from the rc receiver into the prop chip. Then this is processed, together with the sensors, and the prop outputs then control the Esc's which drive the motors. Does that make sense?
a little all of my ESC have 3 wires (data ground and power) only 1 of those can hook to my RC reciver
You don't connect the ESCs to your receiver - they connect to the Propeller, which uses the Servo32 object to control them. The Propeller is connected to the receiver. It reads the throttle, aileron, elevator, and rudder outputs of the receiver, and also reads the gyro, accelerometer, and anything else (like a compass, altitude sensor, or GPS). It then uses all that information to decide how fast to spin each motor to maintain stable flight.
It is exactly as Jason has said. Sorry if that wasn't perfectly clear. BTW be careful. Many ESC's generate the 5v for the servos and you should not connect them together. So, if you use the ESC to supply power to your prop board, you should ensure only 1 ESC has the 5v connected to the prop board.
oh ok so the RC reciver needs to have all the pins on it connected to the propeller. so the quod reciver test code the RC reciver hooks up to these pins on the propeller?
i have tried some code and i need help figuring out how to hook my reciver up to the ESC and then to the propeller board i have the propeller demo board.i have tried all options but it seems like the code that i am trying is not sending the right signal.
I not sure how you have this connected. Normally you would have the Receiver go to the Propeller Demo Board and then the Demo Board outputs to the ESC.
If you could provide a detailed schematic and attach the code you are using, that would be most helpful.
i have tried some code and i need help figuring out how to hook my reciver up to the ESC and then to the propeller board i have the propeller demo board.i have tried all options but it seems like the code that i am trying is not sending the right signal.
Publison is correct. The prop receives the servo positions and then uses the gyros etc to vary those positions and outputs them to the ESCs. I tried running just one servo ESC with a simple test input from the pc. IIRC I published the code in the obex. If not, then it is in this thread.
here is my screenshots on my demo board i have these things hooked up. i dont have a grro yet i just wanted to test the motors with the reciver to see if each motor gets its power and understands that its talking to me. also i have attached the motor test code that was posted in this thread.
Comments
the idea its great to construct a propellerQuadCopter,
i lives in switzerland, and in the next times i make the first step for this project.
and follow your threads
thanks a lot
regards nomad
i'm working on 3D-Software-Simulations under OpenGL for my Quadcopter
-Project and later i build the stuff .
now a question:
(1)
have somebody the formula to calculat the thrust of a BrushLess-Engine:
in watt or in gramms???
my prototype engine is (from ROBBE) a german Company:
- BrushLess-Engine
name: Roxxy BL Outrunner 3535-12
- technical Datas: (sorry in german)
- Spannung (V)
- Zellenzahl: 6-8 / 3 LiPoly
- Torque: (Drehzahl) pro volt (u/min) 1500
- LastStrom: 20-30A
- Propeller dimension = 8.5x6" - 11x7"
- Modell-Weight (QuadCopter) ca. gramm 1000-1900
or
- Roxxy BL Outrunner 3545-12
- Datas:
- Spannung (V)
- Zellenzahl: 8-14 / 3-4 LiPoly
- Drehzahl pro volt (u/min) 850
- LastStrom: 15-25A
- Propeller-Dimensions: 9.5" - 12x8"
- Modell-Weight: ca. gramm 1000-2500
- Brushless-Controler:
-Jeti Advance 30 Plus
Dauerstrom 30A
Zellenzahl 2-3 LiPoly
- Lipo
- Lipo-Akku 3S1P 11.1V /2500 mA/50C
zellenzahl 3
- balancer-steckerSystem
- graubner/robbe
(2) is the Total-Thrust in (Watt or) Gramms
the Sum of the 4 Engines?
Thank you for your Help
Regards
nomad
You might try Knife Edge Software they are the makers of Real Flight Simulator. They have a Forum for such questions.:smilewinkgrin:
-Ron
thanks for your answers
regards nomad
To be honest I'm a little bit worried about the measured 325g thrust with my GWS HD8040 (8" triblade props) it will be definitely higher with the 9" props .... anyway it is OK for now. Hopefully my quad will be under 1Kg
How did you measure the thrust? Because reversing two phases and let the prop press the motor downwards onto the balance will not give you the same amount of thrust when the props is pulling the motor upwards. (Unless you also mounted the blades upside down
Rule of thumb is that you must at least be able to lift twice the weight of the quadcopter. When at exactly the thrust equal to the weight, the quadcopter will not take off.
I have to say I like your frame, looks very stable and hopefully resonance-free :smilewinkgrin:
Greets, Jesse
with the bigger blades I should reach around 400-450g and that will be enough to lift up the quad.
Even now with this thrust I can lift up easily, but there are many more thing to be added like bat, and electronics which hopefully will not exceed 750g-1Kg including the frame.
Then everything should work fine indeed
Wish my scale had that option, mine stops at 0...
I roughly calculated my max thrust and came to a total of 40 N, which is pretty accurate for my current set up.
(I got 4 Hextronik 750kv motors each capable of delivering a thrust of 1.0 kg, and my total weight is 1,5 kg.)
I'm working on the implementation of the Kalman filters right now and after that hopefully a successful testflight
Nomad,
I've used this in the past and it's pretty decent:
http://brantuas.com/ezcalc/dma1.asp
Plug your numbers in to the right places, set the battery and prop types, and it does a fairly accurate job of calculating the thrust and battery draw of a given power setup.
Jason
thanks for the link, its helpful for me.
regards nomad
I got the opportunity today to fly with a heli
Unfortunately not scheduled until Q2 next year. However this will make a nice addition when it comes.
Radio Control Transmitter - Joystick
By IanJ1965 | 11 Oct 2010 Part of The Hardware Zone.
Home built joystick type radio control transmitter based on Arduino
Introduction
Traditionally, RC plane/heli/quadcopter pilots use a dual thumb stick type transmitter, however and especially quadcopter pilots, it's not a very intuitive way to fly especially for the beginner.
We've all seen the movies and at least have a vague idea that a pilot of a real aircraft/spaceship uses a joystick. So why not with RC aircraft.
The basic idea of my project was to implement a joystick solution in the easiest way possible, but one that fulfills my exact requirements.
More info: http://www.codeproject.com/KB/system/RC_Joystick_Tx.aspx
SSM and chickenblender have Quad and Tri copters respectively which do not use any micros (as such). The use off the shelf HK401B gyros from hobbyking.com and chickenblender uses vtail mixers and FMA Copilot too whereas SSM uses the 4x mixers in his transmitter. This is an extremely simple solution without micros. I think a prop with a gyro could do the simple mixing easily.
I know Jason has more complex code running. But this could be a simple start.
You don't connect the ESCs to your receiver - they connect to the Propeller, which uses the Servo32 object to control them. The Propeller is connected to the receiver. It reads the throttle, aileron, elevator, and rudder outputs of the receiver, and also reads the gyro, accelerometer, and anything else (like a compass, altitude sensor, or GPS). It then uses all that information to decide how fast to spin each motor to maintain stable flight.
ThrottlePin = 22
AileronPin = 21
ElevatorPin = 20
RudderPin = 19
just one of the exmpales
i have tried some code and i need help figuring out how to hook my reciver up to the ESC and then to the propeller board i have the propeller demo board.i have tried all options but it seems like the code that i am trying is not sending the right signal.
I not sure how you have this connected. Normally you would have the Receiver go to the Propeller Demo Board and then the Demo Board outputs to the ESC.
If you could provide a detailed schematic and attach the code you are using, that would be most helpful.
here is my screenshots on my demo board i have these things hooked up. i dont have a grro yet i just wanted to test the motors with the reciver to see if each motor gets its power and understands that its talking to me. also i have attached the motor test code that was posted in this thread.
0 = reciver thro
1 = reciver elev
2 = reciver alie
3 = reciver rudd
4 = esc 1
5 = esc 2
6 = esc 3
7 = esc 4
For the gyro, a cheap solution is the Wii Motion Plus at $10 on eBay posted! And the nunchuck has accelerometers!