chrisb

5 ms·

1.
by chrisb 3mo ago
I use an MT6701 magnetic rotary sensor mounted on the motor shaft, running in AB[Z] mode. This is used to measure the angle of the motor, and generate the correct PWM signals for the three motor coils. My inner current-control loop runs at
2.
by chrisb 3mo ago
For a robotic BLDC motor velocity control application, I moved to using a linear ADRC (Active Disturbance Rejection Control) [0] controller. It is not much more complex to implement that a PID, but at least in my context it handles changing
3.
Canonical takes over Flutter desktop maintenance(omgubuntu.co.uk)
7 points by chrisb 4mo ago|0 comments
4.
Using Galileo High Accuracy Service (HAS)(spring-agriculture.com)
1 points by chrisb 8mo ago|0 comments
5.
by chrisb 8mo ago
The linked article is misrepresented. Two points regarding blade recycling techniques taken straight from the top of the article: - Cement co-processing and chemical dissolution are primary viable methods, yielding $27.57/ton and $199.
6.
by chrisb 9mo ago
Many years ago, a moderately complete interpreted .NET runtime - https://github.com/chrisdunelm/DotNetAnywhere This was long before .NET Core, and was designed to allow C# to be used on highly limited platforms
7.
by chrisb 1y ago
Nice to meet an SRC investor :) Yes, it was all very sad the way SRC ended. Coincidentally, we're based fairly close to where they operated. We are in touch with some of the people that used to be involved with SRC, and have been able
8.
by chrisb 1y ago
My knowledge of ROS is a couple of years out of date, but primarily that reproducible testing and simulation, with precise time/clock management, which is essential for a reliable product, was very difficult in ROS. I also felt the ROS
9.
by chrisb 1y ago
Before we started building we considered many different designs, including legs. However, it introduces significant extra mechanical and control complexity, with more complex failure modes - e.g. one leg gets stuck in the mud; it also would
10.
by chrisb 1y ago
https://spring-agriculture.com/ Autonomous robotics for sustainable agriculture. Based in the south of the UK. Prototypes of an autonomous mechanical farm-scale weeding robot currently beginning real-world testing. Still a
11.
by chrisb 2y ago
These are apparently not large EV-type rechargeable lithium batteries, as I immediately assumed. From the article: "Aricell makes lithium primary batteries for sensors and radio communication devices". A "primary battery&quot
12.
by chrisb 3y ago
The article isn't completely clear; but hr-in-select is standardized [0] - and it definitely works in the Firefox v122.0 I'm browsing with. [0] https://html.spec.whatwg.org/multipage/form-elements.html#th...
13.
by chrisb 3y ago
The subsequent prequel "A deepness in the sky" is also well worth a read.
14.
by chrisb 3y ago
This claim of grid overload is false. See [0] for the UK grid operator's view on this, also includes a few numbers relevant to the US grid. [0] https://www.nationalgrid.com/stories/journey-to-net-zero/ele...
15.
by chrisb 5y ago
My anecdotal experience... I own a Peugot iOn (rebadged Mitsubishi i-MiEV) manufactured in 2012, so it's 9 years old. I bought it second hand, and the service record shows it's needed zero maintenance (aside from tires). I have no
16.
by chrisb 6y ago
I live just a few miles to the North. Nice to see a few other ~Dorking locals here :)
17.
by chrisb 7y ago
Interesting paper here on e-prop which is a biologically plausible alternative to backprop: https://www.biorxiv.org/content/10.1101/738385v3
18.
Full Speech: Sir Ivan Rogers on Brexit(news.liverpool.ac.uk)
1 points by chrisb 8y ago|0 comments
19.
by chrisb 8y ago
The energy density really is abysmal, which is why the "lifting heavy things up" techinique of energy storage is essentially never discussed outside of pumped-storage. The problem is the linear relationship between the mass, the h
20.
by chrisb 9y ago
Towards the end of the article, it suggests dissipationless power lines as an application. Whether "dissipationless" is equivalent to "superconducting" I'm not sure; but it sounds the same to me ;)
21.
by chrisb 9y ago
Interactive version of this map showing fishing activity: http://globalfishingwatch.org/map/
22.
Make me an offer I can't refuse – Writing an abstract for a CFP(blog.ndcconferences.com)
1 points by chrisb 9y ago|0 comments
23.
by chrisb 9y ago
"These vulnerabilities affect many CPUs, including those from AMD, ARM, and Intel, as well as the devices and operating systems running them." Curious. All other reports I've read state that AMD CPUs are not vulnerable.
24.
by chrisb 9y ago
I probably won't get around to doing this. But someone else is very welcome to do so :)
25.
by chrisb 9y ago
Sadly DotNetAnywhere definitely isn't ready for production, and by the sounds of it Blazor is not either (I'm not involved in Blazor). It's possible some of the other DNA forks mentioned here may be more suitable for producti
26.
by chrisb 9y ago
I wrote an CIL-to-JS translator too: https://github.com/chrisdunelm/DotNetWebToolkit It's not complete, certainly not usable for anything remotely real, but could handle quite a bit of C#. And was fun to work on :
27.
by chrisb 9y ago
My memory is a little vague... But I'm fairly sure the hardest part to implement was the support for generic types/methods. It made all the code that handles types way more complex (as expected I suppose!), and there's defini
28.
by chrisb 9y ago
I'm the original author of DotNetAnywhere. For all its flaws (and there are quite a few) it was a very interesting learning exercise, and it worked better than I ever really expected ;) I don't really intend to ever do any more wo
29.
by chrisb 9y ago
Reducing the browser window size fixed the glitching for me (Chrome, MacBook Pro).
30.
by chrisb 9y ago
Agreed about the hope for our species. As a species and as individuals we're capable of such astounding accomplishments like this; yet also capable of outstandingly in(s)ane idiocy. How can society be arranged/evolved to encourage

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