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Meet the new RF73 driver
There’s a new wireless radio driver in town for the JeeNode Zero and other µC boards running Mecrisp Forth. It’s called RF73 but it is in fact intended to be used with the RFM70, RFM73, and RFM75....
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2.4 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...
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Interactive Forth over RF?
Since Mecrisp Forth uses the serial port as its interactive console, the most direct way of connecting to a µC board is as follows (double-line arrows represent wired connections):When using some...
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Revisiting 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 HouseMon...
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Redesigning the JET model
The JET project (JeeLabs Embello Toolkit) is the continuation of the earlier HouseMon project (in turn the successor of JeeBus). It’s been a slow starter, but definitely not shelved. The JET “Hub” has...
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Turning JET into a live system
The previous article about the redesigned JET model mentioned Folie as sitting between a USB interface and MQTT, presumably to publish received RF messages on MQTT, and to subscribe to an MQTT topic so...
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Hello 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 topics...
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Quad 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...
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Low-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...
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UT61E 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...
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A 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...
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A 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,...
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Another 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...
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Closures 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...
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Browser-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...
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Diving 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...
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Low-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 ArticleClik here to view.
UT61E 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 ArticleClik here to view.
A 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 ArticleClik here to view.
A 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 Article