Circular motions
Just back from a few days in Paris, visiting friends (a bit south of Paris, actually), but we did manage to squeeze in a stroll in the Jardin du Luxembourg - with memories of a (brief) childhood there,...
View ArticleJust a bunch of opinions
This week, I’ll report about some progress on the next EZ-Retro “v2” PCB and build (which isn’t quite right yet, unfortunately). But first, a topic which has been keeping me busy lately… typing and the...
View ArticleBack to Forth explorations
Now that the EZ-Retro project is beginning to wind down, I’ll start exploring Forth’s features and behaviour a bit more again. One of the distinguishing features of a fully self-hosted system like...
View ArticleSome Mecrisp Forth utilities
This week, I’m going to demonstrate some tools from the Mecrisp Forth distribution. A different prompt, math functions (even without hardware floating point), random numbers, call tracing/profiling,...
View ArticleGoing through the motions
The last word in last week’s introductory weblog post was “flow”. Let’s talk about that for a moment: what is it like to develop a Forth application for an embedded µC, and in particular a remote node?...
View Article2.4 GHz with a JeeNode Zero
The JeeNode Zero has always had two footprints for radio modules on its PCB. Apart from an RFM69 (or RFM12), you can also mount an RFM70, 73, or 75 on there: (this is the older “v1”, the new “v4” is...
View ArticleRevisiting the JET design
There’s not much point sprinkling wireless nodes around the house without also a solid central infrastructure to collect data and manage the outbound control requests. Some readers may remember...
View ArticleHello Pi-hole, goodbye ads!
It’s that time of year again: this is the start of “summer mode” for the JeeLabs weblog. Instead of weekly article series, there will be just one post per week, covering a somewhat wider range of...
View ArticleQuad 18650 power supply
Might not have been such a great idea to 3D-print this DIY supply I made in red: (it does look slightly alarming, I’m afraid) This is a little portable power supply I made a while back, with four very...
View ArticleLow-ripple HP power supply
I got a power supply from eBay a while ago: That’s an HP 6255A: 2x 0..40V @ 1.5A, max 80V in series. But the interesting spec is its very low noise: <0.5 mV and <0.2 mA. These supplies are very...
View ArticleUT61E 4½ digit multimeter
Ah, gadgets… can’t have too many of ‘em! It’s hard to think of anything more useful and relatively low-cost for the electronics lab than the venerable digital multimeter. It’s good to have at least two...
View ArticleA whiff of Denmark...
The past few weeks, I’ve been vacationing in Denmark. Now that Liesbeth is no longer tied to her fixed job schedules, we try to take our summer break before everyone else does in July and August. What...
View ArticleA different mindset
One of the things I get to do on vacation, and especially while traveling by train, is reading (e-)books - tons of them, in fact. I tend to read a lot all year round, technical articles, textbooks,...
View ArticleAnother pile of books
Here are more books I’ve been reading recently, of the “techie” variety and a bit closer to the usual topics on this weblog. For electronics, there’s really not much that can compare to “The Art of...
View ArticleClosures versus Objects
For a recent project I’ve been working on, I had to deal will lots of small components, each with somewhat different behaviour, and had tried several times (unsuccessfully) to come up with a good...
View ArticleBrowser-side programming
It’s been a while since I did any browser-side programming. Even though I’ve been meaning to dive back into it for ages (the reasons for which will become clear in an upcoming weblog post). As we all...
View ArticleDiving into ClojureScript
In my post on multi-platform development recently, I mentioned Clojure (CLJ) as one of the languages which can be compiled to JavaScript - then it’s called ClojureScript (CLJS), although they are...
View ArticleWinding down, switching gears
Let me get right to the point: the scheduled daily weekly posts on this JeeLabs weblog are coming to an end. I’m going to move away-and-onwards from the “blogosphere”. There are several reasons for...
View ArticleArduino IDE w/ LPC824
What will it take to support the LPC824 µC, i.e. the Tinker Pico, from the Arduino IDE? As the Arduino IDE has been evolving and growing over the years, more and more µC platforms have been added -...
View ArticleIDE w/ LPC824, part 2
Let’s get that upload going. Remember, this is about adding a “hardware platform” to the Arduino IDE so it can compile and upload files to a Tinker Pico, based on the LPC824 µC. There are two parts to...
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