This robot uses AI to find Waldo, thereby ruining Where’s Waldo | 19mm Momentary Push Button

Solar charging becomes more cost effective, however, if you’re tapping into a full-house power system. Sources suggest a properly sized whole-house solar system can pay for itself in around seven years, depending on the size of the installation, local labor rates, component costs, and other variables. The national average for a 6-kW home solar power system is reportedly close to $19,000. Fortunately there’s a 30 percent federal tax credit with no limit available to help offset the costs. Unfortunately, the solar-power credit is scheduled to drop to 26 percent in 2020, 22 percent in 2021, and will be discontinued altogether in 2022.

I can’t remember the exact numbers, but before the change, UK mains voltage was acceptable between something like 210V and 270V, depending on grid load. EU mains had a similar range. All they did, was tighten up the range. So now it’s nominally 230V, with 240V being within acceptable range. Which is good because the voltage stayed exactly the same. They just trimmed the range at the top end to be within the EU standards.

I would also use a solid state relay. And I would think about gluing the glass plate with high temp silicone to the PCB. This vastly improves thermal contact and so heat transfer which reduces peak temp and thermal lag in the control loop. Also it prevents exposed live wires even in case the glass breaks.

Attack of the giant hand? That’s what we called these shots when we took them. Despite the disparity between the size of my hand and the camera body, the grip was still fairly comfortable.

It’s impossible to know whether to recommend the new Corolla yet, because no prices or specs have been revealed, although the argument in favour of the latter looks certain to be bolstered by a greater than average amount of standard equipment. In particular, the active safety roster, which includes the ability to apply the brakes if a potential accident is detected at high and low speeds, is far longer than most.

It should be mentioned that any of us that have been working in commercial/industrial settings should be familiar and certified under NFPA70E. This includes, but is not limited to, how to work as safe as possible with hazardous energy sources, what the proper protection is for various levels and what is considered “safe” (working distance, approach distance, protection level, etc).

Just curious, what size pump do you have? The Sonoff claims 10A per channel, but my 1HP pump needs a 40-50A relay to safely deal with cold-start current. Unless the relays are overspec’d I’d be worried about literally burning out those contacts pretty fast.

Installing a ceiling fan might not sound complicated, but it’s nothing like putting together a barbecue yourself. You’re trying to figure out the motor while hoisting a 70-pound fan 12 feet above the floor. Call me up—I can finish the job faster and safer than you could.

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The standard phrase in our repair shop was “electroplated’… as in …”I took that old CRT out and whoosh…. I damn near electroplated myself into the middle of next week when I touched the bottom of the LOPT”…. electrocution was reserved for politicians… as in “….how the hell could there possibly be enough numpties in this country to electorcute that old hag Thatcher…”

So here follows the first in a series on how to approach electronic devices containing high voltages, and live to tell the tale. By “high voltages” we mean anything up to mains voltages, and those directly derived from them such as the few hundred volts rectified DC you’ll find in a switch-mode PSU. For multi-kilovolt EHT you’ll have to wait for another article, because that is an entire subject in itself. We’ll mention these higher voltages in passing, but their detail is best left for a Hackaday colleague with more pertinent experience.

Well yeah, that’s what I’ve seen, they fail on and stay on until either they or the piece of kit they are running catch fire.