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Hack A Day (6 unread)

X-Band linear rail SAR imaging

Posted: June 17th, 2010, 1:03pm MDT by Caleb Kraft

[Greg Charvat] really wanted high resolution X-Band linear rail SAR imaging system. He wanted it bad enough to scrounge through parts at HAM radio swap meets until he had the bits to build one himself. The unit is used to take high resolution radar imaging. For example, the image above is constructed of push pins [...]
Student Soaker, wireless water gun

Posted: June 17th, 2010, 12:00pm MDT by Jakob Griffith

As far as pranks go, [Austin Shaf's] wireless hidden water gun is a real treat. The video above goes over a brief explanation and shows the setup in action. The prankster holds onto a wireless AVR remote, and when the unsuspecting victim walks by, he activates a second AVR controlling a pump; spraying water everywhere. [...]
The PR2 calls the shots

Posted: June 17th, 2010, 11:00am MDT by Mike Szczys

Can you beat this robot at pool? This sparks something of a “let the wookie win” attitude for us, but we still love to watch the video. This is the PR2 playing pool thanks to the folks over at the Willow Garage. It uses a laser sensor to detect the legs of the pool table, [...]
Replacement speedometer

Posted: June 17th, 2010, 10:00am MDT by Mike Szczys

[Howard] built his own replacement speedometer for his truck after the original speedometer cable broke. He’s using surface mount components and produced a two-board design that is quite nice. When he tipped us off he mentioned that this is Arduino powered and uses a hall effect sensor. There’s not talk of this in his writeup but we [...]
Building a cluster of iPaq PCs

Posted: June 17th, 2010, 9:00am MDT by Mike Szczys

[Steven Pigeon] got his hands on ten iPaq computers that a friend acquired through an eBay auction. The older machines were in good condition but the march of technology had left them behind as casualties. He’s given them new life by assembling a cluster. The first order of business was testing the hardware to make [...]
No nonsense mbed development demo

Posted: June 17th, 2010, 8:14am MDT by Mike Szczys

This tweeting RFID reader is a great working example for the mbed. When an RFID tag is read it is matched with the name of the owner and a Twitter message is sent out. This is very similar to the RFID cat tracker that used an Arduino. The code is short and simple due to [...]