"It's as heavy as a brick. The mane reason it's taken 4 years for the XV-11 to finally become popular for hobbyists is the difficulty in getting one without the vacuum cleaner. Only now can you find a small number on ebay. …"
"Hey, I got the invensense DMP code working, it gives a nice quaternion output. Trying to figure out how to use magnetometer reading with it, any tips? here's the code https://github.com/ntavish/mpu9150-pic32"
"Once in Pass-through mode is enabled, to communicate with the mag you use 0x0C as the address.
I had to Write to address 0x0C at register 0x0A the value 00000001 (0x01) to put the mag into single measurement mode.
After every read cycle, the…"
"Hi zack, thanks for the reply
I found one problem with my I2C code, I was sending restart transmission condition in I2C writes, which was wrong. After fixing this I have been able to port the invensense sample code to PIC32. Some progress, but still…"
"Before you can get ANY readings, the MPU must be taken out of "Sleep" mode by setting PWR_MGMT_1 to 0x01.
Once that config register is set, you should be able to set the remaining config settings & read from the MPU.
I too have had…"
"Hey, I've been trying to get imu9150 to do anything at all. I started with porting the invensense code for msp430 to my platfrom(pic32), it used to never be able to load the firmware. I left that for a while to just try and get the raw…"
"They're going to make a lot of money on all that user submitted data. Imagine if every camera was implemented as a cloud service & every photo ever taken had to be uploaded to a data center before it could be viewed. "
"It is a nice idea. One possibility regarding the vehicle motor interference problem might be to reverse the system and put the magnetometers around the room and then measure the "interference" from the vehicle to determined its…"
"GPS = Absolute position (sort of and not so good indoors)
Beacon = local relative position (presented here, also assorted other IR beacon types.
Object and or environment relative position = Sonar -> Laser scanner -> Structured light -> TOF…"
"Worked on the Giant Wind Tunnel facility (biggest in the world) here for a few months many years ago and got to spend a lot of time in and around the old blimp hangars as well.
You always feel like an ant crawling around on the ground in this place,…"
Most diy droners are RC modelers who just want to automate their favorite model plane. I came from an image processing, software, & robotics background, not an RC modeling background, so my focus is on flight control, image acquisition, & blogs that no-one reads.
Interesting reading. I spent some time with your blog at rcgroups, noting in particular your application of artificial neural nets. I may have missed a jump in your progression, but are you still running the lwneuralnet on a gumstix ? Just wondering, as most neural net libraries use floating point, but the gumstix only has fpu emulation, which is not fast.
Reason I ask is that I converted a simple back prop library to integer math and built it into my firmware, but have just started to think about how to incorporate it into actual operation. As you already have real-world experience in integrating back prop functions, I wondered if you wanted to give the code a try (on the ground) to see if the integer approximations are sufficiently accurate. I map 0.0 : 1.0 into 0 : 1024. If interested, code is here. Let me know if you have a chance to experiment - I'd appreciate some feedback.
Converted lwneuralnet to integer a long time ago. It worked for solving the neural network but not for back propagation. Back propagation required more precision & full range beyond 0-1. 2048 lookup table entries was the largest before the cache overflowed.
Thanks for your answer. I alreadi recovered the archive. Could you please send me some more detals concerning the hardware(components, electric connections, procedures for preliminar adjustement of parameters, etc); something "pense bete" for a beginer in the field. Yours Georges
sorry, for asking these questions. I am trying to design a board that I want to sell in the $80-100 price range. so trying to understand the target costs. any help would be appreciated. Just for fun, not going to make any money on it. Thanks.
Most of the people on diydrones sell products through Sparkfun. The standard arrangement is to add 40% to the price & Sparkfun adds another 40% to the price. It's no secret. A place like Cloudcap adds 1000% to the parts. Personally working in Indian outsourcing where they expect a 12 hour / 6 day commitment & if you're spending evenings selling your own product instead of your boss's, it better produce a 1000% return or you're out. All your time is company time in outsourcing.