Leaking water detector from an old smoke alarm

[Thomas Clauser] had his basement flood last year when a hurricane swept over New England. The problem with flooding or leaking water is that chances are you won’t notice until it’s too late. He decided to protect against this in the future by building his own leaking water detector. It’s a simple device that sits on the floor of his basement and triggers an audio alarm if water begins to cover the floor.

He used an old smoke detector for the build; a nice choice since it’s loud, and designed for long-term battery operation. It also has a button for testing if the detector is working. [Thomas] removed the PCB from the smoke detector case and soldered wires onto the test button contacts. He cut a sponge to squeeze it inside of a PVC pipe connector housing. That sits against the floor, with the wires for the test button contacts placed through the sponge. If water is soaked up by the sponge it completes the circuit and triggers the alarm.

A few other design features really make this a nice setup. He notched out the bottom of the PVC connector so that water can flow freely, and added a switch to one of the probe wires lets him kill the alarm when inspecting the damage.

Nokia schematics via Shenzhen


The silicon hacker behind the Chumby, [bunnie huang], was browsing through the Mobile Phone Megamarket in Shenzhen, China and stumbled upon an unusual repair book. It turns out the book had the schematics to hundreds of Nokia phones. It’s hard to tell if they are legitimate, but the amount of information makes them seem so. [bunnie] claims that the book is a learning experience because it shows how some sub-circuits are implemented. Also, it can be a good reference for sourcing parts. Since Nokia buys millions of each component, the supply of parts they use are stable. There are also editions for other brands, such as Motorola and Samsung.

Palm Pre Mojo SDK leaked


Pre Insiders has reported that the Pre’s Mojo SDK has been leaked to the internet. Palm was planning an early access program, eventually releasing the SDK by the end of the summer, but this leak has accelerated the process. They are posting several download links, including torrents, but they warn developers to use the tools wisely.

Related: Palm Pre teardown

[via techmeme]

uTorrent for Mac leaked via Pirate Bay

In a somewhat ironic chain of events, uTorrent alpha for Mac has been leaked on Pirate Bay.  Initial reviews are positive, with some saying that it runs better than its windows counterpart. The search function seems to be broken though.

[via BoinBoing Gadgets]