Gerard Toonstra
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  • Pernambuco
  • Brazil
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Gerard Toonstra's Groups

Gerard Toonstra's Discussions

Vector control ESC

Started Mar 22, 2015 0 Replies

About half a year…Continue

Tags: control, oriented, field

Simulator (python) for BLDC motor control

Started Mar 15, 2015 0 Replies

I'm developing the control software for my own ESC and recognized the need for a simulation model so that I can run my algorithm against it, so that I can see the effect of a variety of issues.…Continue

Tags: motor, simulator, simulation, controller, BLDC

Johnny Dronehunter

Started this discussion. Last reply by John Arne Birkeland Aug 3, 2014. 1 Reply

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Drone crashes on parking lot (Cypress, Texas)

Started this discussion. Last reply by Keith Bartlett Apr 10, 2014. 2 Replies

From local news, unconfirmed by me:CYPRESS, Texas -- A customer at an HEB store in Cypress was stunned when something fell from the sky Tuesday – a drone!…Continue

 

Gerard Toonstra's Page

Latest Activity

Glenn M commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"Looks like I didn't have the Cycle Slip markers on for those last obs plots, but I've been reading the rtklibexplorer blog and there's some good info on there. I re-did the test this afternoon but powered the units on for 5 minutes…"
Feb 6
Glenn M commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"I can't see any cycle slips (red lines) in any of them by viewing the obs data for each GPS in RTKlib. In all of them there seems to be some sats which the receiver sees intermittently, with the Drotek XXL with the big antenna picking up more…"
Feb 6
Chad Hill commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"look in RTKLib to see if you are getting more cycle slips in the ones that arent getting a good result?"
Feb 6
Glenn M commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"Thanks for looking at this. Is there an easy way to see if one receiver lost sats that the others didn't, or do I just play the log in u-center and see if I can spot sats dropping out? I'm using a Drotek XXL M8N for my PPP-Static…"
Feb 6
Brandon Mogan commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"@ Glenn M Can you tell if all of the units were seeing the same set of sats for the entire test? Better yet, did the two with the fuzzy positions lose sats that the others saw the entire time? It has been a while since I messed with these units but…"
Feb 6
Glenn M commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"I'm having trouble getting reliable results using this method. Can someone who's had success with this see where I might be going wrong? I have 5 x M8N units on tripods (with TRK-MEAS turned on), connected to openlogs, and I space them…"
Feb 6
DAniel Dumitru commented on Gerard Toonstra's blog post Experiments with an industrial USB webcam
"Could you please tell us what camera did you use ? is from http://www.e-consystems.com/  ? BR, Daniel"
May 6, 2016
ActionDrone commented on Gerard Toonstra's blog post Redesigning multirotor ESC's
"+1 interested. Any Kickstarter project so far?"
Apr 26, 2016
Clive Turvey commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"The 3.01 firmware does not disable raw output, it changes the parameters and obfuscates things slightly. The 2.01 (ROM/EXT) continues to function, so unless you have some compelling reason to use the unvalidated Galileo constellation you can flash…"
Feb 7, 2016
Tom commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"Newest M8N firmware update disables raw output, hence commands are no longer available for newest rtklib version.  Does anyone know a reasonable priced geomap service to verify coordinates? Google maps provides rather volatile accuracy (0.4m -…"
Feb 7, 2016
Dimitri Arendt commented on Gerard Toonstra's blog post Redesigning multirotor ESC's
"Hi Gerard, I am quite interrested in your new ESC design. Any progress recently? Also when you mentionned the noise reduction with the sinusoidal drive (FOC), I guess the noise of the motor/ESC is reduced but in multi-rotor the noise comes mainly…"
Feb 1, 2016
Clive Turvey commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"ALL current uBlox offerings can output 'raw' measurements, the M8N via TRK-MEAS, only the M8T has the RXM-RAWX which is the officially blessed manner to get RINEX polished data."
Dec 22, 2015
Adam Kroll commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"Sorry I should have read earlier posts, covert the data in rtconv."
Dec 22, 2015
Adam Kroll commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"@Sobido, I thought the M8N didn't record raw?  I thought you would need the M8T to record raw.  If you are getting raw files from M8N can you please share how you do it.  Thanks,"
Dec 22, 2015
Clive Turvey commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"I've used these Duinopeak NEO-M8N GPS Shield for Arduino with Antenna mashed together with STM32 Nucleo and Discovery boards to record hourly RINEX observation files directly to a Micro SD card. The TCXO's in the M8N series parts offer…"
Dec 22, 2015
Chad Hill commented on Gerard Toonstra's blog post Cheap 1-2cm (scale) accuracy for your surveys
"@sobido Could you provide a little more info about your setup above for static post-processing? Id love to try building one of these. Thanks!"
Sep 30, 2015

Profile Information

About Me:
...
Please tell us a bit about your UAV interest
http://www.cridea.com.br
Hometown:
Recife

Gerard Toonstra's Photos

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Gerard Toonstra's Blog

Opensourcing ESC work

Posted on July 12, 2015 at 6:00am 12 Comments

So almost a year ago, I posted about how I started work on a field oriented control ESC:

Redesigning multirotor ESC's

Some people in the comments already said how they made their own or started work on different…

Continue

Experiments with an industrial USB webcam

Posted on July 3, 2015 at 3:51pm 6 Comments

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, this is the maximum resolution for reasonable framerates of 25fps…

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Project Ion charter

Posted on June 7, 2015 at 1:57pm 8 Comments

I'd like to invite the diydrones members to participate in a project I started on github: Project Ion on github

The control of uav's have improved a whole lot in the past couple of years and you can now pretty much put one in the…

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Cheap 1-2cm (scale) accuracy for your surveys

Posted on April 21, 2015 at 7:46pm 54 Comments

Image: Topcon RTK collecting survey points

High precision GPS systems are getting more known and used and RTK is already becoming a familiar acronym. This post is about the use of RTK for collecting ground control points to be used in high quality survey results, not about RTK for…

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Comment Wall (2 comments)

At 2:46pm on May 1, 2014, Giovanni Gadaleta said…

Good morning Mr. Toonstra's
I congratulate you on the work posted right now.
I have a question for you: if you use a Canon SX260 could you tell me the GPS coordinate at which point of the picture refers?

Thank you very much.

Giovanni

At 10:39am on January 20, 2015, Tom McKinnon said…

Gerald,  We haven't processed imagery from very much sugar cane so we'd be very interested in helping you out with your project.

Best,

Tom McKinnon

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