About

Gender

Male


Location

Pernambuco


About Me:

...


Please tell us a bit about your UAV interest

http://www.cridea.com.br


Hometown:

Recife


Activity Feed

Gerard Toonstra commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"Brandon,
The image is a real RTK used to get ground truth for the positions. It depends on the environment whether antennas need to be slightly elevated. Any type of vegetation or trees can obscure the signals or decay them, which decreases results,…"
Aug 10, 2015
Gerard Toonstra replied to David Locascio's discussion Photogrammetry Workstation/Server
"David,
So did you try to allocate resources as indicated here?
https://support.pix4d.com/hc/en-us/articles/202560199
The support guy doesn't seem to understand the problem outline very well, so the answer is not very precise, but in answer 1 he says…"
Jul 23, 2015
Gerard Toonstra replied to David Locascio's discussion Photogrammetry Workstation/Server
"$6000 is already quite a high amount for a reasonable station. I probably spent $2000 on my setup and it's doing very well, built it myself from components bought online at cheaper alternatives.
Pix4D has a page about their recommendations:…"
Jul 22, 2015
Gerard Toonstra commented on Gerard Toonstra's blog post Opensourcing ESC work
"I did use that A4960 chip, but had to dump it because it was taken off the market and also it's not suitable for projects that involve this kind of motor drive. What you could do is look for A4960 projects (they are around) and look into the source…"
Jul 22, 2015
Gerard Toonstra commented on Gerard Toonstra's blog post Opensourcing ESC work
"Hi Jure,
I noticed the freescale libraries later on. Part of the exercise was to implement this myself and if you look at the algorithm, it looks pretty trivial. The thing you do need is a good processor with floating point.
Symptoms of the…"
Jul 15, 2015
Gerard Toonstra commented on Gerard Toonstra's blog post Opensourcing ESC work
"Btw, one of the things I didn't even get close to was a technique to further improve the efficiency of the ESC. Most implementations use a simple PWM scheme for the motor actuation. When vector control is already used, most of the computational…"
Jul 14, 2015
Gerard Toonstra commented on Gerard Toonstra's blog post Opensourcing ESC work
"The ground pad was soldered. The docs contain the datasheets with additional info on the BoostXL board (the board that has the driver chip pre-soldered), which contains more info on how to route, solder and place components.
The chip was soldered…"
Jul 14, 2015
Gerard Toonstra posted a blog post
So almost a year ago, I posted about how I started work on a field oriented control ESC:Redesigning multirotor ESC'sSome people in the comments already said how they made their own or started work on different ESC's. I went through 5 iterations of…
Jul 12, 2015
Gerard Toonstra commented on Jay Ryan's blog post UAS Secondary GPS Tracking System
"Where's the antenna on this thing?  If the antenna is in the device, it probably still gets a lock, but your precision significantly suffers because it doesn't have an unobscured view."
Jul 10, 2015
Gerard Toonstra commented on Gerard Toonstra's blog post Experiments with an industrial USB webcam
"Well, I did some searching around and these low level interfaces are great when you have hardware that interfaces with it and know what to do (have an oscilloscope, plenty of patience, etc). The raspi cam is specifically for the raspi and the csi-2…"
Jul 5, 2015
Gerard Toonstra posted a blog post
Above is a fullsize image of a 5MP webcam. A webcam usually has a CMOS sensor and commercial ones support up to 720p resolution. 720p is a result of the usb bus bandwidth available to stream the images and since many computers still use USB 2.0,…
Jul 3, 2015
Gerard Toonstra replied to SirGeo's discussion email response from a UAV business
"I don't mean it's inaccurate, but it says that the FAA would more than likely not allow it "on the application", plus the state law of $1000 per picture. Then in 2, it says they work "within the rules". If the application is disallowed, then 2 is…"
Jul 1, 2015
Gerard Toonstra replied to SirGeo's discussion email response from a UAV business
"If the FAA doesn't allow it, then nobody can, so 1 and 2 are somewhat mutually exclusive.

For 3 he has a point I think. If you are new to the technology, don't expect to get really great results the first time. you need to ramp up your experience,…"
Jul 1, 2015
Gerard Toonstra replied to matemm06's discussion Near-Infrared Camera Options in Agricultural UAVs
"A big rubber mat that can be rolled up or separated into parts, about 3m rectangular.
If you use CHDK, I believe there are also options to have it respond to signals over USB, but not sure if this is part of the uav script now. This is done by…"
Jul 1, 2015
Gerard Toonstra commented on Simon D. Levy's blog post GooMPy: Interactive Google Maps for Python
"Very nice. Years ago, I used libchamplain a lot, which has support for lines, polygons and animated markers, but that hasn't been updated in a while. Very useful if you want to visualize things that are going on in a mission."
Jun 28, 2015
Gerard Toonstra replied to David Locascio's discussion Converting a Raster Image to a Vector Format
"No, you need an app to do photogrammetry for that. See the wiki of project-ion above and the processing of data section. It shows some tools you could use for that."
Jun 18, 2015
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