[Anders] tipped us off about his hack that re-purposes a smoke alarm as a burglar alarm. Unfortunately, he came home in the middle of a burglary but wanted to be ready the next time someone tries to break in. By cleverly patching into the test button on an old smoke detector he created a circuit-trip alarm. One side of each piece of wire is secured to the frame and jam of a window. A paper clip completes the circuit by pinching the two bare conductors. If the window is opened the connection is lost and the alarm sounds.
We see a few problems with this system. First off, never hack your ONLY smoke detector, you are putting lives at risk by doing so. But [Anders] says he’ll have a replacement detector and since these things need to be replace every ten years or so, chances are you can find an old one kicking around. We’d recommend disguising the case so that people aren’t confused about it being a smoke detector. Secondly, he’s mounted the alarm right in the window frame so most likely an invader will just smash the thing to bits.
Anyway, it’s still an interesting reuse of these ubiquitous, and life-saving, devices.
[Techb] had a friend who was paralyzed after an accident and could no long use a computer. He rigged up an amazingly simple mouse interface using python to implement infrared tracking. The controller was built from an old hat by adding an IR LED and wireless mouse modified so that the button could be clicked by the user’s mouth. A webcam with exposed film used as a filter can track the IR LED and take input from the wireless mouse buttons.
This setup, which draws inspiration from Wii Remote white boards, is much simpler than the Eyewriter (and doesn’t shine an IR LED into your eye). Although [Techb] wants to add facial recognition to the system, there’s something to be said for such a simple implementation.
[Tom Lee] and his colleagues of Sunlight Labs just moved to a new office. The doors are setup like a security checkpoint with electronic strikes and buttons on the inside to allow entry. The button simply completes a low-voltage circuit, activating the strike which made it quite easy to patch into. They build an interface board with a small relay to complete that circuit. As we’ve seen before, Linksys routers have plenty of extra room in the case so there was no problem housing the new circuit in this tiny network device. Now [Nicko] and his friends can use a custom app to input an access code or to verify a device ID from a cell phone and gain entry. The door still has keyed locks in case of a power outage. In fact, the only change made to the system was the addition of two wires to the “door release” button as seen above. See the one-touch device ID authentication in the video after the break.
This hack is similar to the GSM door entry from last year. In this case, the phones are communicating with the door via web interface and not the GSM network.
Will O’Brien at Biobug.org has been doing some cellphone integration work. He recently picked up some Motorola c168i cellphones from eBay. It turns out there is a serial port that uses TTL communication with a standard head-phone jack as an interface. [Will] soldered up a connector and used a USB to FTDI cable to interface with the phone. To his surprise he was able to read off the stored text messages even though they were PIN protected in the phone’s operating system. The messages on these units were trivial but this is another example of the importance of clearing your data before discarding your devices.
What if you could point your cellphone’s camera at someone’s face, and then know that person’s name, schedule, profile, and latest tweets? That’s the promise of Recognizr, an Android app prototype using a 3D model to recognize facial features, find a match on its server, and then superimpose that person’s social networking preferences around his or her face.
Created by Swedish mobile software designers The Astonishing Tribe, it’s astonishing indeed. Problem is, unless everyone opts into this service, it won’t be particularly useful. However, if it were ubiquitous, imagine how easy it would be to act like you’re using your cellphone, but actually be finding out that person’s name standing in front of you — while you snoop around her Facebook profile.
Finally, Facebook stalking finds its way to meatspace! On a smaller scale, this could be useful at, say, a trade show or a party. Electronic nametags would be lots of fun, if everyone would submit to them.
Apple has not made it easy to let the iphone communicate with external devices. Basically, you need a jailbroken phone to do anything. This post covers the current state of serial communication on the iphone.
A succesful example of making an application that uses the serialport on the iphone is xGPS, which let you connect to an external GPS.
Now that the protocol for basic communication with the TI chronos ez430 has been worked out (see previous posts) I needed to work on something useful. So I set out to try and control my wireless light switch with the watch. Sadly the RF receiver supplied with the chronos does not use a protocol which is likely to ever be compatible with the arduino so this example requires a computer.
Data Logger for iPhone enables you to store and graph any data of your choosing along with a timestamp and geolocation. You might use Data Logger to store electricity meter readings, to create maps of pollution or temperature sensor readings around your neighbourhood, or animal sightings around the city. You can also set up custom data feeds, with user-defined min and max values, tags, description and units.
Viper Guard has called for urgent Government action to control rising oil prices and is warning of a new wave of fuel theft. The warning follows predictions that speculation in the oil market will soon see diesel prices back at last summer’s high of £1.25-£1.30 litre, when both trucks and fuel storage tanks in depots became high-value targets for organised crime.
But Viper Guard General Manager Debbie Jones said things could be worse this time round thanks to the recession.
“Hard times not only tempt people into crime but also put pressure on potential purchasers not too ask too many questions,” she said. “Obviously we would urge all operators to make sure they have adequate security measures in place this summer, but we want to see Government action too.
“The Government sowed the seeds of the problem itself when the Chancellor first put 2p on a litre to offset his 2.5% VAT cut last November and then went ahead with the further 2p increase in April. These increases need to be reversed urgently both to help hauliers through the recession and to head off the expected increase in fuel theft.”
She also urged the Government to control the activities of speculators in the City. “These gamblers are threatening the health of the entire road transport sector, with inevitable knock-on effects across the economy,” she said. “But after the Government bail-outs in the banking industry last year, many of the speculators are effectively state employees.
“The lesson of the credit crunch, surely, is that it’s enormously harmful to allow bankers to pursue their own narrow agenda at the expense of the wider public interest. Yet it seems the bankers have learnt nothing and are carrying on in the same old way. The Chancellor can and must rein them in before they do more damage.”
