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https://sites.google.com/view/temperature-pro Adding Human Detection To Home Automation | Hackaday Radar made a huge impact when it was first invented, allowing objects to be detected using radio waves which would normally be difficult or impossible to observe through other means. Radio waves of all frequencies can be used for radar as well, whether that’s detecting ships beyond the horizon, tracking aircraft near an airport, penetrating the ground, or imaging objects with a high resolution. At the millimeter wavelength it’s fairly easy to detect humans with the right hardware, and using some inexpensive radar modules [Tech Dregs] shows us how to add this capability a home automation system. Since these modules aren’t trying to image humans with fine detail or detect them at long range, the hardware can be fairly inexpensive. [Tech Dregs] is using the LD2410B modules which have not only an on-board microcontroller but also have the radio antennas used for radar built right onto the PCB

https://tiyona-t4m7cq.blogspot.com/p/fume-dog.html Turning steel waste into circular cement - Springwise Username or Email Address Password Remember Me Turning steel waste into circular cement Turning steel waste into circular cement Property & Construction Can this modular tech cut concrete's massive carbon footprint? Spotted: Concrete is responsible for 1.5 per cent of the UK’s total greenhouse gas emissions, and the bulk of these are generated during production of cement – the substance that binds concrete. Blast furnace (BF) slag, a by-product of steel production, has long been incorporated into concrete mixtures to reduce the volume of cement required. However, with the steel industry decarbonising and switching from fossil fuel BFs to electric arc furnaces, less BF slag is available, and the new slag can’t be mixed into concrete in the same way. Enter Cocoon. The London-based startup has developed a new technology that allows it

https://tiyona-t4m7cq.blogspot.com/p/fume-dog.html This Tiny Steam Engine Takes A Watchmaker’s Skill To Build | Hackaday When your steam engine build requires multiple microscopes, including those of the scanning electron variety, you know you’re building something really, really tiny. All of the usual tiny superlatives and comparisons apply to [Chronova Engineering]’s latest effort — fits on a pencil eraser, don’t sneeze while you’re working on it or you’ll never find it. If we were to put the footprint of this engine into SMD context, we’d say it’s around a 2010 or so. As one would expect, the design is minimalistic, with no room for traditional bearings or valves. The piston and connecting rod are one piece, meaning the cylinder must pivot, which provides a clever way of switching between intake and exhaust. Tiny crankshaft, tiny flywheel. Everything you’d associate with a steam engine is there, but just barely. The tooling needed to accomplish this feat is pretty impressive too. [C