So you hear that someone is building a clock that will run for 10,000 years and you think ‘oh, that’s neat’. Then you start looking into it and realize that it’s being built on a mountain-sized scale in a remote part of the US and things start to get a bit strange. As much as it might sound like a Sci-Fi novel (or some creative trolling), the Long Now Foundation is in the process of building and installing a clock that will chime once per year for the next ten millennia.
The clock, currently under construction will be over 200 feet tall, residing in a shaft drilled in a limestone mountain in West Texas. The allusion to [Indian Jones] sprung to mind when we read that the shaft will be drilled from the top down, then have a shaft with a robot arm installed to mill a spiral staircase into the stone walls. And this isn’t the only clock planned; a second site in Nevada has already been purchased.
There are a lot of interesting features, not the least of them is a ‘chime engine’ that plays a unique tune each year that will never be repeated again. [Alex] sent us the original tip to a Wired article that covers the project in incredible detail. But we also found a SETI talks video that runs for an hour. You’ll find that embedded after the break.
Continue reading “10,000 year clock sounds like an Indiana Jones flick – makes us wonder if we’re being trolled”
Tired of hearing that flat sounding wireless doorbell when visitors happen to come by? Don’t get rid of it, improve it by adding a real bell. This hack rigs up a small hand bell to the wireless doorbell receiver. It was prototyped using LEGO pieces to shake the sound out of the bell, but the finished version uses a servo motor on a wooden frame. An Arduino monitors the wireless receiver, driving the servo when a transmission from the front door button is received.
Traditionally door bells have actually been chimes that are struck with solenoids. We appreciate this rendition because it adds an element of kinetic art to the home, laying bare the functional hardware instead of hiding it in a box. Don’t miss the demonstration after the break.
Continue reading “Wireless doorbell rings a real bell”
[Dan Kouba’s] parents replaced their doorbell button with one that lights up and found that the chime wouldn’t stop sounding after the button was pushed. These lighted buttons use an incandescent bulb in parallel with the button (a piece of hardware we’ve hacked in the past). It draws a small amount of current which isn’t enough to trigger the chime, but it is just enough that the chime unit reacts as if the button press never stopped. His parents asked what he could do about this and after some investigation he build a replacement board for the chime unit based around an ATtiny26L. The board monitors the voltage drop across a resistor in the doorbell circuit. When the comparator on the AVR detects a rise in the voltage drop across the resistor it rings the chimes, actuating the solenoids with a set of PNP transistors. [Dan] sent us all of the details which you can check out after the break.
Continue reading “Replacing the driver board in an old-school door chime”