Viewing profile — chrisb

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 t…

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 implemen…

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 ar…

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 us…

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…

My knowledge of ROS is a couple of years out of date, but primarily that reproducible testing and simulation, with precise time/clock management, which is essential for a reliable …

Before we started building we considered many different designs, including legs. However, it introduces significant extra mechanical and control complexity, with more complex failu…

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 curre…

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 co…

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/multipa…

The subsequent prequel "A deepness in the sky" is also well worth a read.

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…

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 nee…

I live just a few miles to the North. Nice to see a few other ~Dorking locals here :)

Interesting paper here on e-prop which is a biologically plausible alternative to backprop: https://www.biorxiv.org/content/10.1101/738385v3

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 …

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 …

Interactive version of this map showing fishing activity: http://globalfishingwatch.org/map/

"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 …

I probably won't get around to doing this. But someone else is very welcome to do so :)