Hello,
for a helicopter IMU. But recently I have heard that ST's sensors are bad for helicopter IMU's, as they are bad with vibration. Would this work? If not, can someone suggest a accelerometer/check my gyro choice?
I really dont understand the degrees/s, what does this refer too? more sensitivity? is so, what am I aiming for? that sensor breakout comes in 50 degrees/s to 300 degrees/s.
I am stuck on an accelerometer, can someone suggest one from :http://www.sparkfun.com/commerce/categories.php?c=163 (I can't solder BGA).

Any information is appreciated!

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DIY Helicopter IMU's are still pretty cutting edge. Sounds like you have a lot of research to do. You don't provide enough info about your goals to suggest any components.
Sorry about that.

This is for a quadrotor. My main goal is to get a neural network based flight control, and then later implement surface vehicle/air vehicle co-operation.

Here was my original plan: http://rp181.fortscribe.com/?p=447
Ravi,

I am also interested in the answers you seek (I'm working on an autonomous quadrotor project). If I find anything out I will let you know.

The deg/sec tells you the nominal maximum values of the sensor. Since the output has limited resolution (its either read by A/D converters, or sent digitally) the max value also effectively sets the sensitivity (deg/s/bit)

Also, have you seen this: http://mbed.org/? Looks like it might be more powerful and cheaper than the sparkfun board (note: I am not an expert in these ARM chips - I just happened to notice this)

- Roy
I took a look at the mbed board (never looked into it). Its not more powerful, but powerful enough depending on the application.

I think I may start with that, as I dont need a programmer, and it cuts cost and weight.
Ravi and Roy,

May I suggest you look at the MikroKopter and UAVX flight controllers for ideas on what sensors to use? These are arguably the most advanced open source quadrocopter platforms. I have both. If you need links, let me know.

- Don
Thanks! I looked at those quite a bit, and another one I found. From what I read and Roy told me, I narrowed it down to these:
http://www.sparkfun.com/commerce/product_info.php?products_id=9269
3x http://www.sparkfun.com/commerce/product_info.php?products_id=9058

These are ADXL335 (accel) and ADXRS610(gyro) sensors.
Can someone confirm this?

I have another question. I looked around, but can't find how brushless motor controllers (TURNIGY ones from hobbyking) take input. Is it PWM?
Yes, it is PWM.

There are tons of quad projects already out there, including loads of IMUs that you can buy already made. It makes no sense for a beginner to start one from scratch at this point. Keep reading and you'll save yourself a lot of time and trouble.
I prefer making everything my self, it helps me learn much better. I don't just wan't a quadrocopter, that would get boring for me, I like actually making it (like my railgun project). I already designed a frame:
http://rp181.fortscribe.com/?p=458

I have been thinking about micro controllers (first time to MCU's, not programming though). What do you guys think of the mbed (http://mbed.org/nxp/lpc1768/) as a central processor? It has decent program space, enough PWM, ADC's for the sensors, UART (LCD display, GPS) and a Ethernet port (I may experiment with Ethernet bridges for a ground master and Arial slave).

I researched, but would like input from people experienced with quadrotors.
I have seen that. It is not quite as powerful as I want, as I plan on working on kalman filter's (know someone who specializes in kalman filters and ferroelectrics, so thats a huge benefit) and implementing a Scale-invariant feature transform for basic recognition from the camera. This is a testbed, i expect to grow out of the mbed, but its a starting point.


If you know what you're doing, you can make them out of any gyros. The key is knowing what you're doing.
Hi Ravi,
see my project and repository I think that you can found some thinks interesting for your project : http://code.google.com/p/lnmultipilot10/
Regards
Roberto

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