December 12, 2008

Rotating Blue LED Display
Complex Hacks

29

  Thanks to Csaba for sending in this very nice looking display. The frosted blue LEDs have a great effect! Project code (zip). "Motor An old tape recorder motor. With this load it can rotate about 7.4/s. The image is flashing, it should rotate about 25/s. For supply a 7809 IC is used. Supply of the rotor The commutator of another similar motor is used (crw_1511) and a 3 phase

HP Printer Display Hack - No Computer Needed
Complex Hacks

8

  Our friend Sprite_tm has had some time to play a clever prank. Some HP printers have the ability for code to modify what is being displayed on the status screen. This HP Printer Display Hack uses that feature to make a stand alone module that displays some funny comments to the roommate that felt that it was OK to leave a bunch of printers laying around for others to